[Code of Federal Regulations]
[Title 7, Volume 11]
[Revised as of January 1, 2003]
From the U.S. Government Printing Office via GPO Access
[CITE: 7CFR1755.397]
[Page 460-483]
TITLE 7--AGRICULTURE
CHAPTER XVII--RURAL UTILITIES SERVICE, DEPARTMENT OF AGRICULTURE
PART 1755--TELECOMMUNICATIONS STANDARDS AND SPECIFICATIONS FOR MATERIALS, EQUIPMENT AND CONSTRUCTION--Table of Contents
Sec. 1755.397 RUS performance specification for line concentrators.
(a) General. (1) This section covers general requirements for a line
concentrator (LC) system. This system shall operate in accordance with
the manufacturer's specifications. Reliability shall be of prime
importance in the design, manufacture and installation of the equipment.
The equipment shall automatically provide for:
(i) Terminating subscriber lines at a location remote from the
serving central office;
(ii) Concentrating the subscriber lines over a few transmission and
supervisory paths to the serving central office; and
(iii) Terminating the lines at the central office without loss of
individual identity. A subscriber connected to a line concentrator shall
be capable of having essentially the same services as a subscriber
connected directly to the central office equipment (COE). Intra-unit
calling among subscribers connected to the concentrator may be provided,
but is not required.
(2) Industry standards, or portions thereof, referred to in this
paragraph (a) are incorporated by reference by RUS. This incorporation
by reference was approved by the Director of the Federal Register in
accordance with 5 U.S.C. 552 (a) and 1 CFR part 51. Copies of these
standards are available for inspection during normal business hours at
RUS, room 2838, U.S. Department of Agriculture, Washington, DC 20250 or
at the Office of the Federal Register, 800 North Capitol Street, NW.,
suite 700, Washington, DC.
(3) American National Standards Institute (ANSI) standards are
available from ANSI Inc., 11 West 42nd Street, 13th floor, New York, NY
10036, telephone 212-642-4900.
(i) ANSI Standard S1.4-1983, Specification for Sound Level Meters,
including Amendment S1.4A-1985.
(ii) [Reserved]
(4) American Society for Testing Materials (ASTM) are available from
1916 Race Street, Philadelphia, PA 19103, telephone 215-299-5400.
(i) ASTM Specification B33-91, Standard Specifications for Tinned
Soft or Annealed Copper Wire for Electrical Purposes.
(ii) [Reserved]
(5) Bell Communications Research (Bellcore) standards are available
from Bellcore Customer Service, 8 Corporate Place, Piscataway, NJ 08854,
telephone 1-800-521-2673.
(i) TR-TSY-000008, Issue 2, August 1987, Digital Interface between
the SLC 96 Digital Loop Carrier System and a Local Digital Switch.
(ii) Bell Communications Research (Bellcore) document TR-TSY-000057,
Issue 1, April 1987, including Revision 1, November 1988, Functional
Criteria for Digital Loop Carrier Systems.
(iii) Bell Communications Research (Bellcore) Document TR-NWT-
000303, Issue 2, December 1992, including Revision 1, December 1993,
Integrated Digital Loop Carrier System Generic Requirements, Objectives,
and Interface.
(6) Federal Standard H28, Screw-Thread Standards for Federal
Services, March 31, 1978, including Change Notice 1, May 28, 1986;
Change Notice 2, January 20, 1989; and Change Notice 3, March 12, 1990.
Copies may be obtained from the General Services Administration,
Specification Section, 490 East L'Enfant Plaza SW, Washington, DC 20407,
telephone 202-755-0325.
(7) IEEE standards are available from IEEE Service Center, 445 Hoes
Lane, P.O. Box 1331, Piscataway, NJ 08854, telephone 1-800-521-2673.
[[Page 461]]
(i) IEEE Standard 455-1985, Standard Test Procedure for Measuring
Longitudinal Balance of Telephone Equipment Operating in the Voice Band.
(ii) [Reserved]
(8) RUS standards are available from Publications and Directives
Management Branch, Administrative Services Division, Rural Utilities
Service, room 0180, South Building, U.S. Department of Agriculture,
Washington, DC 20250-1500.
(i) RUS Bulletin 345-50, PE-60 (Sept 1979), RUS Specification for
Trunk Carrier Systems.
(ii) [Reserved]
(b) Types of requirements. (1) Unless otherwise indicated, the
requirements listed in this section are considered to be fixed
requirements.
(2) The concentrator system shall communicate with standard T1
digital transmission format at a minimum between the concentrator and
central office terminals. Analog conversion functions at remote and
central office terminals shall be capable of being eliminated to
accommodate end-to-end digital transmission.
(3) The LC shall operate properly as an integral part of the
telephone network when connected to physical or carrier derived circuits
and central offices meeting RUS specifications and other generally
accepted telecommunications practices, such as Bellcore documents TR-
NWT-000303, Integrated Digital Loop Carrier System Generic Requirements,
Objectives and Interface; TR-TSY-000008, Digital Interface between the
SLC 96 Digital Loop Carrier System and a Local Digital Switch; and TR-
TSY-000057, Functional Criteria for Digital Loop Carrier Systems.
(4) For RUS acceptance consideration of a LC, the manufacturer must
certify and demonstrate that all requirements specified in this section
are available and in compliance with this section.
(5) Certain requirements are included in this section for features
which may not be needed for every application. Such features are
identifiable by the inclusion in the requirements of some such phrase as
``when specified by the owner'' or ``as specified by the owner.'' In
some cases where an optional feature will not be required by an owner,
either now or in the future, a system which does not provide this
feature shall be considered to be in compliance with the specification
for the specific installation under consideration, but not in compliance
with the entire specification.
(6) The owner may properly request bids from any supplier of an RUS
accepted LC whose system provides all the features which will be
required for a specific installation.
(7) When required by the owner, the supplier shall state compliance
to the Carrier Serving Area (CSA) requirements, as stated in Bell
Communications Research (Bellcore) Standard TR-TSY-000057, Functional
Criteria for Digital Loop Carrier Systems.
(c) Reliability. (1) The failure rate of printed circuit boards
shall not exceed an average of 2.0 percent per month of all equipped
cards in all system terminals during the first 3 months after cutover,
and shall not exceed an average of 1.0 percent per month of all equipped
cards in all system terminals during the second 3-month period. The
failure rate for the equipment shall be less than 0.5 percent per month
of all equipped cards in all system terminals after 6 months. A failure
is considered to be the failure of a component on the PC board which
requires it to be repaired or replaced.
(2) The line concentrator terminal units shall be designed such that
there will be no more than 4 hours of total outages in 20 years.
(d) System type acceptance tests. General test results will be
required on each system type. Any system provided in accordance with
this section shall be capable of meeting any requirement in this section
on a spot-check basis.
(e) Features required. The network control equipment and peripheral
equipment shall be comprised of solid-state and integrated circuitry
components as far as practical and in keeping with the state-of-the-art
and economics of the subject system.
(f) Subscriber lines--(1) General. (i) The remote LC units shall
operate satisfactorily with subscriber lines which meet all of the
conditions under the bidder's specifications and all the requirements of
this section. This section recognizes
[[Page 462]]
that the loop limit of the line concentrator is dependent upon the
transmission facility between the LC central office termination and the
LC remote unit. When voice frequency (physical) circuits are used, the
loop limit from the COE to the subscriber shall be 1900 ohms (including
the telephone set). When electronically derived circuits (carrier,
lightwave, etc.) are used, the loop limits of the electronic system will
control. The bidder shall identify the loop limits of the equipment to
be supplied.
(ii) There should be provisions for such types of lines as ground
start, loop start, regular subscriber, pay stations, etc.
(2) Dialing. (i) General. The line concentrator remote and central
office terminal equipment shall satisfactorily transmit dialing
information when used with subscriber dials having a speed of operation
between 8 and 12 dial pulses per second and a break period of 55 to 65%
of the total signaling period.
(ii) Subscriber dial interdigital time. The remote and central
office LC equipment shall permit satisfactory telecommunications
operation when used with subscriber rotary dial interdigital times of
200 milliseconds minimum, and pushbutton dialing with 50 milliseconds
minimum.
(iii) Subscriber line pushbutton dialing frequencies. The frequency
pairs assigned for pushbutton dialing when provided by the central
office shall be as listed in this paragraph (f)(2)(iii), with an
allowable variation of 1.5 percent:
------------------------------------------------------------------------
High group frequencies (Hz)
Low group frequencies (Hz) ---------------------------------------
1209 1336 1477 1633
------------------------------------------------------------------------
697............................. 1 2 3 Spare.
770............................. 4 5 6 Spare.
852............................. 7 8 9 Spare.
941............................. * 0 0.5 dB from the loss
specified by the bidder.
(6) Return loss. The specified return loss values are determined by
the service and type of port at the measuring end. Two-wire ports are
measured at 900 ohms in series with 2.16 microfarads, and 4-wire ports
are measured at 600 ohms resistive. When other balance networks are
supplied, test equipment arranged for operation with the supplied
network(s) may be used. The requirement given shall meet the following
cited values on each balance network available in the system:
Line-to-Line or Line-to-Trunk (2-Wire)
Echo Return Loss (ERL)--18 dB, Minimum
Singing Return Loss (SRL)--Low--15 dB, Minimum
Singing Return Loss (SRL)--High--18 dB, Minimum
(7) Longitudinal balance. The minimum longitudinal balance, with dc
loop currents between 20 to 70 mA, shall be 60 dB at all frequencies
between 60 and 2000 Hz, 55 dB at 2700 Hz and 50 dB at 3400 Hz. The
method of measurement shall be as specified in the IEEE standard 455,
``Standard Testing Procedure for Measuring Longitudinal Balance of
Telephone Equipment Operating in the Voice Band.'' Source voltage level
shall be 10 volts root mean square (rms) where conversation battery feed
originates at the remote end.
(8) 60 hz longitudinal current immunity. The LC 60 Hz longitudinal
current immunity shall be measured in accordance with Figure 1 of this
section. Under test conditions cited on Figure 1 of this section, the
system noise shall be 23 dBrnC or less as follows:
[[Page 464]]
[GRAPHIC] [TIFF OMITTED] TR29AU95.002
(9) Steady noise (idle channel at 900 ohm impedance). Steady noise:
Measure on terminated call. Noise measurements shall comply with the
following:
Maximum--23 dBrnC0
Average--18 dBrnC0 or Less
3KHz Flat--Less than 35 dBrnO as an Objective
(10) Impulse noise. LC central office terminal equipment shall have
an impulse noise limit of not more than five counts exceeding 54 dBrnC0
voice band weighted in a 5-minute period on six such measurements made
during the busy hour. A WILCOM T-194C Transmission Test Set, or
equivalent, should be used for the measurements. The
[[Page 465]]
measurement shall be made by establishing a normal connection from the
noise counter through the switching equipment in its off-hook condition
to a quiet termination of 900 ohms impedance. Office battery and
signaling circuit wiring shall be suitably segregated from voice and
carrier circuit wiring, and frame talking battery filters provided, if
and as required, in order to meet these impulse noise limits.
(11) Crosstalk coupling. Worst case equal level crosstalk shall be
65 dB minimum in the range 200 to 3400 Hz. This shall be measured
between any two paths through the system by connecting a 0 dBm0 level
tone to the disturbing pair.
(12) Digital error rate. The digital line concentrator shall not
introduce more than one error in 10 \8\ bits averaged over a 5-minute
period, excluding the least significant bit.
(13) Quantizing distortion. (i) The system shall meet the following
requirements:
------------------------------------------------------------------------
Minimum signal to
Input level (dBm0) 1004 or 1020 Hz distortion with C-message
weighting
------------------------------------------------------------------------
0 to -30................................... 33 dB
-30 to -40................................. 27 dB
-40 to -45................................. 22 dB
------------------------------------------------------------------------
(ii) Due to possible loss of the least significant bit on direct
digital connections, a signal to distortion degradation of up to 2 dB
may be allowed where adequately justified by the bidder.
(14) Overload level. The overload level shall be +3 dBm0.
(15) Gain tracking (linearity) shall meet the following
requirements:
------------------------------------------------------------------------
Maximum
Input signal level \1\ gain
deviation
------------------------------------------------------------------------
+3 to -37 dBm0............................................. 0.5 dB
-37 to -50 dBm0............................................ 1 dB
------------------------------------------------------------------------
\1\ 1004 Hz reference at 0 dBm0.
(16) Frequency response (loss relative to 1004 Hz) for line-to-line
(via trunk group or intra-link) connections shall meet the following
requirements:
------------------------------------------------------------------------
Frequency (Hz) Loss at 0 dBm0 input \1\
------------------------------------------------------------------------
60........................................ 20 dB Min.\2\
300....................................... -1 to +3 dB
600 to 2400............................... +1 dB
3400...................................... -1 to +3 dB
------------------------------------------------------------------------
\1\ (-) means less loss and (+) means more loss.
\2\ Transmit End.
(17) Envelope delay distortion. On any properly established
connection, the envelope delay distortion shall not exceed the following
limits:
------------------------------------------------------------------------
Frequency (Hz) Microseconds
------------------------------------------------------------------------
1000 to 2600.............................................. 190
800 to 2800............................................... 350
600 to 3000............................................... 500
400 to 3200............................................... 700
------------------------------------------------------------------------
(18) Absolute delay. The absolute one-way delay through the line
concentrator, excluding delays associated with the central office
switching equipment, shall not exceed 1000 microseconds analog-to-analog
measured at 1800 Hz.
(19) Insertion loss. The insertion loss in both directions of
transmission at 1004 Hz shall be included in the insertion loss
requirements for the connected COE switch and shall not increase the
overall losses through the combined equipment beyond the values for the
COE alone, when operated through a direct digital interface. Systems
operated with a (VF) line circuit interface may introduce up to 3 dB
insertion loss. Reference Sec. 1755.522(q)(3).
(20) Detailed requirements for direct digital connections. (i) This
paragraph (h)(20) covers the detailed requirements for the provision of
interface units which will permit direct digital connection between the
host central office and line concentrator subscriber terminals over
digital facilities. The digital transmission system shall be compatible
with T1 type span lines using a DS1 interface and other digital
interfaces that may be specified by the owner. The RUS specification for
the T1 span line equipment is PE-60. Other span line techniques may also
be used. Diverse span line routing may be used when specified by the
owner.
(ii) The output of a digital-to-digital port shall be Pulse Code
Modulation (PCM), encoded in eight-bit words using the mu-255 encoding
law and D3 encoding format, and arranged to interface with a T1 span
line.
[[Page 466]]
(iii) Signaling shall be by means of Multifrequency (MF) or Dual
Pulsing (DP) and the system which is inherent in the A and B bits of the
D3 format. In the case where A and B bits are not used for signaling or
system control, these bits shall only be used for normal voice and data
transmission.
(iv) When a direct digital interface between the span line and the
host central office equipment is to be implemented, the following
requirements shall be met:
(A) The span line shall be terminated in a central office as a
minimum a DS1 (1.544Mb/s) shall be provided;
(B) The digital central office equipment shall be programmed to
support the operation of the digital port with the line concentrator
subscriber terminal;
(C) The line concentrator subscriber terminal used with a direct
digital interface shall be interchangeable with the subscriber terminal
used with a central office terminal.
(i) Alarms. The system shall send alarms for such conditions as
blown fuses, blocked controls, power failure in the remote terminal,
etc., along with its own status indication and status of dry relay
contact closures or solid-state equivalent to the associated central
office alarm circuits. Sufficient system alarm points shall be provided
from the remote terminal to report conditions to the central office
alarm system. The alarms shall be transmitted from the remote terminal
to the central office terminal as long as any part of the connecting
link is available for this transmission. Fuses shall be of the alarm and
indicator type, and their rating designated by numerals or color code on
fuse positions.
(j) Electrical protection--(1) Surge protection. (i) Adequate
electrical protection of line concentrator equipment shall be included
in the design of the system. The characteristics and application of
protection devices must be such that they enable the line concentrator
equipment to withstand, without damage or excessive protector
maintenance, the dielectric stresses and currents that are produced in
line-to-ground and tip-to-ring circuits through the equipment as a
result of induced or conducted lightning or power system fault-related
surges. All wire terminals connected to outside plant wire or cable
pairs shall be protected from voltage and current surges.
(ii) Equipment must pass laboratory tests, simulating a hostile
electrical environment, before being placed in the field for the purpose
of obtaining field experience. For acceptance consideration RUS requires
manufacturers to submit recently completed results (within 90 days of
submittal) of data obtained from the prescribed testing. Manufacturers
are expected to detail how data and tests were conducted. There are five
basic types of laboratory tests which must be applied to exposed
terminals in an effort to determine if the equipment will survive.
Figure 2 of this section, Summary of Electrical Requirements and Tests,
identifies the tests and their application as follows:
[[Page 467]]
Figure 2.--Summary of Electrical Requirements and Tests
--------------------------------------------------------------------------------------------------------------------------------------------------------
Number of
Test Application criteria Peak voltage or Surge waveshape applications and Comments
current maximum time between
--------------------------------------------------------------------------------------------------------------------------------------------------------
Current surge...................... Low impedance paths 500A or lesser current 10x1000 [mu]s........ 5 each polarity at 1 None.
exposed to surges. (see fig. 4). minute intervals.
60 Hz current carrying............. High or low impedance 10A rms or lesser 11 Cycles of 60 Hz 3 each at 1 minute None.
paths exposed to current (see fig. 6). (0.183 Sec.). intervals.
surges.
AC Power service surge voltage..... AC power service 2500V or +3 [sigma] 1.2x50 [mu]s......... 5 each polarity at 1 AC arrester, if used,
connection. clamping V of minute intervals. must be removed.
arrester employed at Communications line
10kV/[mu]s. arresters, if used,
remain in place.
Voltage surge...................... High impedance paths 1000V or +3 [sigma] dc 10x1000 [mu]s........ 5 each polarity at 1 All primary
exposed to surges. breakdown of arrester minute intervals. arresters, if used,
employed. must be removed.
Arrester response delay............ Paths protected by +3 [sigma] breakdown 100V/[mu]s rise decay 5 each polarity at 1 All primary
arresters, such as of arrester employed to \1/2\ V. in minute intervals. arrestors, if used,
gas tubes, with at 100V/[mu]s of rise. tube's delay time. must be removed.
breakdown dependent
on V. rate of rise.
--------------------------------------------------------------------------------------------------------------------------------------------------------
[[Page 468]]
(iii) Electrical protection requirements for line concentrator
equipment can be summarized briefly as follows:
(A) Current surge tests simulate the stress to which a relatively
low impedance path may be subjected before main frame protectors break
down. Paths with a 100 Hz impedance of 50 ohms or less shall be
subjected to current surges, employing a 10x1000 microsecond waveshape
as defined in Figure 3 of this section, Surge Waveshape. For the purpose
of determining this impedance, arresters which are mounted within the
equipment are to be considered zero impedance. The crest current shall
not exceed 500A; however, depending on the impedance of the test
specimen this value of current may be lower. The crest current through
the sample, multiplied by the sample's 100 Hz impedance, shall not
exceed 1000 V. Where sample impedance is less than 2 ohms, peak current
shall be limited to 500A as shown in Figure 4 of this section, Current
Surge Tests. Figures 3 and 4 follow:
[GRAPHIC] [TIFF OMITTED] TR29AU95.003
[[Page 469]]
[GRAPHIC] [TIFF OMITTED] TR29AU95.004
(B) Sixty Hertz (60 Hz) current carrying tests shall be applied to
simulate an ac power fault which is conducted to the unit over the cable
pairs. The test shall be limited to 10 amperes Root Mean Square (rms) of
60 Hz ac for a period of 11 cycles (0.1835 seconds) and shall be applied
longitudinally from line to ground.
(C) AC power service surge voltage tests shall be applied to the
power input terminals of ac powered devices
[[Page 470]]
to simulate switching surges or lightning-induced transients on the ac
power system. The test shall employ a 1.2x50 microsecond waveshape with
a crest voltage of 2500 V. Communications line protectors may be left in
place for these tests.
(D) Voltage surge tests which simulate the voltage stress to which a
relatively high impedance path may be subjected before primary
protectors break down and protect the circuit. To ensure coordination
with the primary protection while reducing testing to the minimum,
voltage surge tests shall be conducted at a 1000 volts with primary
arresters removed for devices protected by carbon blocks, or the +3
sigma dc breakdown voltage of other primary arresters. Surge waveshape
should be 10x1000 microseconds.
(E) Arrester response delay tests are designed to stress the
equipment in a manner similar to that caused by the delayed breakdown of
gap type arresters when subjected to rapidly rising voltages. Arresters
shall be removed for these tests, the peak surge voltage shall be the +3
sigma breakdown voltage of the arrester in question on a voltage rising
at 100 V per microsecond, and the time for the surge to decay to half
voltage shall equal at least the delay time of the tube as explained in
Figure 5 of this section, Arrester Response Delay Time as follows:
[GRAPHIC] [TIFF OMITTED] TR29AU95.005
(iv) Tests shall be conducted in the following sequence. As not all
tests are required in every application, non-applicable tests should be
omitted:
(A) Current Impulse Test;
(B) Sixty Hertz (60 Hz) Current Carrying Tests;
[[Page 471]]
(C) AC Power Service Impulse Voltage Test;
(D) Voltage Impulse Test; and
(E) Arrester Response Delay Time Test.
(v) A minimum of five applications of each polarity for the surge
tests and three for the 60 Hz Current Carrying Tests are the minimum
required. All tests shall be conducted with not more than 1 minute
between consecutive applications in each series of three or five
applications to a specific configuration so that heating effects will be
cumulative. See Figure 6 of this section, 60 Hz Current Surge Tests as
follows:
[GRAPHIC] [TIFF OMITTED] TR29AU95.006
[[Page 472]]
(vi) Tests shall be applied between each of the following terminal
combinations for all line operating conditions:
(A) Line tip to ring;
(B) Line ring to ground;
(C) Line tip to ground; and
(D) Line tip and ring tied together to ground.
(2) Dielectric strength.(i) Arresters shall be removed for all
dielectric strength tests.
(ii) Direct current potentials shall be applied between all line
terminals and the equipment chassis and between these terminals and
grounded equipment housings in all instances where the circuitry is dc
open circuit from the chassis, or connected to the chassis through a
capacitor. The duration of all dielectric strength tests shall be at
least 1 second. The applied potential shall be at a minimum equal to the
plus 3 sigma dc breakdown voltage of the arrester, provided by the line
concentrator manufacturer.
(3) Insulation resistance.Following the dielectric tests, the
insulation resistance of the installed electrical circuits between wires
and ground, with the normal equipment grounds removed, shall not be less
than 10 megohms at 500 volts dc at a temperature of 68 deg.F (20
deg.C) and at a relative humidity of approximately 50 percent. The
measurement shall be made after the meter stabilizes, unless the
requirement is met sooner. Arresters shall be removed for these tests.
(4) Self-protection.(i) All components shall be capable of being
continuously energized at rated voltage without injury. Design
precautions must be taken to prevent damage to other equipment
components when a particular component fails.
(ii) Printed circuit boards or similar equipment employing
electronic components should be self-protecting against external grounds
applied to the connector terminals. Board components and coatings
applied to finished products shall be of such material or so treated
that they will not support combustion.
(iii) Every precaution shall be taken to protect electrostatically
sensitive components from damage during handling. This shall include
written instructions and recommendations.
(k) Miscellaneous--(1) Interconnect wire.All interconnect wire shall
be of soft annealed tinned copper wire meeting the requirements of ASTM
Specification B33-91 and of suitable cross-section to provide safe
current carrying capacity and mechanical strength. The insulation of
installed wire, connected to its equipment and frames, shall be capable
of withstanding the same insulation resistance and dielectric strength
requirements as given in paragraphs (j)(2) and (j)(3) of this section at
a temperature of 120 deg.F (49 deg.C), and a relative humidity of 90
percent.
(2) Wire wrapped terminals.These terminals are preferred and where
used shall be of a material suitable for wire wrapping. The connections
to them shall be made with a wire wrapping tool with the following
minimum number of successive non-overlapping turns of bare tinned copper
wire in contact with each terminal:
(i) 6 turns of 30 gauge;
(ii) 6 turns of 26 gauge;
(iii) 6 turns of 24 gauge; or
(iv) 5 turns of 22 gauge.
(3) Protection against corrosion. All metal parts of equipment
frames, distributing frames, cable supporting framework and other
exposed metal parts shall be constructed of corrosion resistant
materials or materials plated or painted to render them adequately
corrosion resistant.
(4) Screws and bolts. Screw threads for all threaded securing
devices shall be of American National Standard form in accordance with
Federal Standard H28, unless exceptions are granted to the manufacturer
of the switching equipment. All bolts, nuts, screws, and washers shall
be of nickel-copper alloy, steel, brass or bronze.
(5) Environmental requirements. (i) The bidder shall specify the
environmental conditions necessary for safe storage and satisfactory
operation of the equipment being bid. If requested, the bidder shall
assist the owner in planning how to provide the necessary environment
for the equipment.
(ii) To the extent practicable, the following temperature range
objectives shall be met:
[[Page 473]]
(A) For equipment mounted in central office and subscriber
buildings, the carrier equipment shall operate satisfactory within an
ambient temperature range of 32 deg.F to 120 deg.F (0 deg.C to 49
deg.C) and at 80 percent relative humidity between 50 deg.F and 100
deg.F (10 deg.C and 38 deg.C); and
(B) Equipment mounted outdoors in normal operation (with cabinet
doors closed) shall operate satisfactorily within an ambient temperature
range (external to cabinet) of -40 deg.F to 140 deg.F (-40 deg.C to
60 deg.C) and at 95 percent relative humidity between 50 deg.F to 100
deg.F (10 deg.C to 38 deg.C). As an alternative to the (60 deg.C)
requirement, a maximum ambient temperature of 120 deg.F (49 deg.C)
with equipment (cabinet) exposed to direct sunlight may be substituted.
(6) Stenciling. Equipment units and terminal jacks shall be
adequately designated and numbered. They shall be stenciled so that
identification of equipment units and leads for testing or traffic
analysis can be made without unnecessary reference to prints or
descriptive literature.
(7) Quantity of equipment bays. Consistent with system arrangements
and ease of maintenance, space shall be provided on the floor plan for
an orderly layout of future equipment bays. Readily accessible terminals
will be provided for connection to interbay and frame cables to future
bays. All cables, interbay and intrabay (excluding power), if
technically feasible, shall be terminated at both ends by connectors.
(8) Radio and television interference. Measures shall be employed by
the bidders to limit the radiation of radio frequencies generated by the
equipment so as not to interfere with radio, television receivers, or
other sensitive equipment.
(9) Housing. (i) When housed in a building supplied by the owner, a
complete floor plan including ceiling height, floor loading, power
outlets, cable entrances, equipment entry and travel, type of
construction, and other pertinent information shall be supplied.
(ii) In order to limit corrosion, all metal parts of the housing and
mounting frames shall be constructed of suitable corrosion resistant
materials or materials protectively coated to render them adequately
resistant to corrosion under the climatic and atmospheric conditions
existing in the area in which the housing is to be installed.
(10) Distributing frame. (i) The line concentrator terminal
equipment located at the central office shall be protected by the
central office main distribution frame. The bidder may supply additional
protection capability as appropriate. All protection devices (new or
existing) shall be arranged to operate in a coordinated manner to
protect equipment, limit surge currents, and protect personnel.
(ii) The distributing frame shall provide terminals for terminating
all incoming cable pairs. Arresters shall be provided for all incoming
cable pairs, or for a smaller number of pairs if specified.
(iii) The current carrying capacity of each arrester and its
associated mounting shall coordinate with a 22 gauge copper
conductor without causing a self-sustaining fire or permanently damaging
other arrester positions. Where all cable pairs entering the housing are
24 gauge or finer, the arresters and mountings need only
coordinate with 24 gauge cable conductors.
(iv) Remote terminal protectors may be mounted and arranged so that
outside cable pairs may be terminated on the left or bottom side of
protectors (when facing the vertical side of the MDF) or on the back
surface of the protectors. Means for easy identification of pairs shall
be provided.
(v) Protectors shall have a ``dead front'' (either insulated or
grounded) where live metal parts are not readily accessible.
(vi) Protectors shall be provided with an accessible terminal of
each incoming conductor which is suitable for the attachment of a
temporary test lead. They shall also be constructed so that auxiliary
test fixtures may be applied to open and test the subscriber's circuit
in either direction. Terminals shall be suitable for wire wrapped
connections or connectorized.
(vii) If specified, each protector group shall be furnished with a
factory assembled tip cable for splicing to the outside cable; the tip
cable shall be 20 feet (6.1 m) in length, unless otherwise
[[Page 474]]
specified. Tip cable used shall be RUS accepted.
(viii) Protector makes and types used shall be RUS accepted.
(l) Power equipment--(1) General. When specified, batteries and
charging equipment shall be supplied for the remote terminal of the line
concentrator.
(2) Operating voltage. (i) The nominal operating voltage of the
central office and remote terminal shall be 48 volts dc, provided by a
battery with the positive side tied to system ground.
(ii) Where equipment is dc powered, it must operate satisfactorily
over a range of 50 volts 6 volts dc.
(iii) Where equipment is ac powered, it must operate satisfactorily
over a range of 12010 volts or 22010 volts ac.
(3) Batteries. (i) Unless otherwise specified by the owner, sealed
batteries shall be supplied for the remote line concentrator terminal.
(ii) The batteries shall have an ampere hour load capacity of no
less than 8 busy hours. When an emergency ac supply source is available,
the battery reserve may be reduced to 3 busy hours.
(iii) The batteries shall be sealed when they are mounted in the
cabinet with the concentrator equipment.
(iv) When specified by the owner, battery heaters shall be supplied
in a bidder-furnished housing.
(4) Charging equipment. (i) One charger capable of carrying the full
dc power load of the remote terminal shall be supplied unless otherwise
specified by the owner.
(ii) Charging shall be on a full float basis. The rectifiers shall
be of the full wave, self-regulating, constant voltage, solid-state type
and shall be capable of being turned on and off manually.
(iii) When charging batteries, the voltage at the battery terminals
shall be adjustable and shall be set at the value recommended for the
particular battery being charged, provided it is not above the maximum
operating voltage of the central office switching equipment. The voltage
shall not vary more than 0.02 volt dc per cell between 10%
load and 100% load. Between 3% and 10% load, the output voltage shall
not vary more than 0.04 volt dc per cell. Beyond full load
current the output voltage shall drop sharply. The above output voltage
shall be maintained with input line voltage variations of plus or minus
10 percent. Provision shall be made to manually change the output
voltage of the rectifier to 2.25 volts per cell to provide an
equalization charge on the battery.
(iv) The charger noise, when measured with a suitable noise
measuring set and under the rated battery capacitance and load
conditions, shall not exceed 22 dBrnC. See Figure 7 of this section,
Charger Noise Test as follows:
[[Page 475]]
[GRAPHIC] [TIFF OMITTED] TR29AU95.007
(v) The charging equipment shall be provided with a means for
indicating a failure of charging current whether due to ac power
failure, an internal failure in the charger, or to other circumstances
which might cause the output voltage of the charger to drop below the
battery voltage. Where a supplementary constant current charger is used,
an alarm shall be provided to indicate a failure of the charger.
(vi) Audible noise developed by the charging equipment shall be kept
to a minimum. Acoustic noise resulting from operation of the rectifier
shall be expressed in terms of dB indicated on a sound level meter
conforming to American National Standards Institute S1.4, and shall not
exceed 65 dB (A-weighting) measured at any point 5 feet (1.5m) from any
vertical surface of the rectifier.
[[Page 476]]
(vii) The charging equipment shall be designed so that neither the
charger nor the central office equipment is subject to damage in case
the battery circuit is opened for any value of load within the normal
limits.
(5) Power panel. (i) Battery and charger control switches, dc
voltmeters, dc ammeters, fuses and circuit breakers, supervisory and
timer circuits shall be provided as required. Portable or panel mounted
frequency meters or voltmeters shall be provided as specified by the
owner.
(ii) Power panels, cabinets and shelves, and associated wiring shall
be designed initially to handle the line concentrator terminal when it
reaches its ultimate capacity as specified by the owner.
(iii) The power panel shall be of the ``dead front'' type.
(6) Ringing equipment. The ringing system shall provide sufficient
ringing on a bridged basis over the voltage and temperature limits of
this section and over subscriber drops within the limits stated by the
bidder. The ringing system shall be without operational problems such as
bell tapping during dialing. The bidder shall state the minimum number
(not less than two) of main station ringers that can be used for each
ringing option available.
(7) Interrupter equipment. The interrupter may be an integral part
of the system or may be part of the associated central office equipment
connected to the line concentrator central office terminal.
(8) Special systems. Manufacturers of LC systems that operate by
extending ringing current from the central office shall state their
required input ringing (voltage and frequency) and the limitations on
the connected subscriber loop.
(m) Fusing requirements--(1) General.(i) The equipment shall be
completely wired and equipped with fuses, trouble signals, and all
associated equipment for the wire capacity of the frames or cabinets
provided.
(ii) Design precautions shall be taken to prevent the possibility of
equipment damage arising from the insertion of an electronic package
into the wrong connector or the removal of a package from any connector
or improper insertion of the correct card in its connector.
(2) Fuses. Fuses and circuit breakers shall be of an alarm and
indicator type, except where the fuse or breaker location is indicated
on the alarm printout. Their rating shall be designated by numerals or
color codes on the fuse or the panel.
(n) Trouble location and test--(1) Equipment. (i) Trouble
indications in the system may be displayed in the form of lights on the
equipment units or printed circuit boards.
(ii) When required, a jack or other connector shall be provided to
connect a fault or trouble recorder (printer or display).
(2) Maintenance system. (i) The maintenance system shall monitor and
maintain the system operation without interruption of call processing
except for major failures.
(ii) The maintenance system shall be arranged to provide the ability
to determine trouble to an individual card, functional group of cards,
or other equipment unit.
(o) Spare parts. Lists of spare parts and maintenance tools as
recommended by the bidder shall be provided. The cost of such tools and
spare parts shall be indicated and shall not be included in the base
price.
(p) Drawings and printed material. (1) The bidder shall supply
instructional material for each line concentrator system involved at the
time of delivery of the equipment. It is not the intent of this section
to require system documentation necessary for the repair of individual
circuit boards.
(2) Three complete sets of legible drawings shall be provided for
each central office to be accessed. Each set shall include all of the
following:
(i) Drawings of major equipment items such as frames, with the
location of major component items of equipment shown therein;
(ii) Wiring diagrams indicating the specific method of wiring used
on each item of equipment and interconnection wiring between items of
equipment;
(iii) Maintenace drawings covering each equipment item that contains
replaceable parts, appropriately identifying each part by name and part
number; and
[[Page 477]]
(iv) Job drawings including all drawings that are individual to the
particular line concentrator involved such as mainframe, power
equipment, etc.
(3) The following information shall also be furnished:
(i) A complete index of required drawings;
(ii) An explanation of electrical principles of operation of overall
concentrator system;
(iii) A list of tests which can be made with each piece of test
equipment furnished and an explanation of the method of making each
test;
(iv) A sample of each form recommended for use in keeping records;
(v) The criteria for analyzing results of tests and determining
appropriate corrective action;
(vi) A set of general notes on methods of isolating equipment faults
to specific printed circuit cards in the equipment;
(vii) A list of typical troubles which might be encountered,
together with general indications as to probable location of each
trouble; and
(viii) All special line concentrator system grounding requirements.
(4) When installation is to be done by the bidder a complete set of
drawings shall be provided by the owner, such as floor plans, lighting,
grounding and ac power access.
(q) Installation and acceptance--(1) General. Paragraphs (q)(2)(i)
through (q)(3)(xxi) of this section covers the general requirements for
the installation of line concentrator equipment by the bidder, and
outlines the general conditions to be met by the owner in connection
with such installation work. The responsibilities apply in both the
central office installation and remote terminal installations, unless
otherwise noted.
(2) Responsibilities of owner. The owner shall:
(i) Allow the bidder and its employees free access to the premises
and facilities at all hours during the progress of the installation;
(ii) Provide access to the remote site and any other site for
development work needed during the installation;
(iii) Take such action as necessary to ensure that the premises are
dry and free from dust and in such condition as not to be hazardous to
the installation personnel or the material to be installed (not required
when remote terminal is not installed in a building);
(iv) Provide heat or air conditioning when required and general
illumination in rooms in which work is to be performed or materials
stored;
(v) Provide suitable openings in buildings to allow material to be
placed in position (not required when a remote terminal is not installed
in a building);
(vi) Provide the necessary conduit and commercial and dc-ac inverter
output power to the locations shown on the approved floor plan drawings;
(vii) Provide 110 volts a.c., 60 Hz commercial power equipped with a
secondary arrester and a reasonable number of outlets for test,
maintenance and installation equipment;
(viii) Provide suitable openings or channels and ducts for cables
and conductors from floor to floor and from room to room;
(ix) Provide suitable ground leads, as designated by the bidder (not
required when remote terminal is not installed in a building);
(x) Provide the necessary wiring, central office ground and
commercial power service, with a secondary arrester, to the location of
an exterior remote terminal installation based on the voltage and load
requirements furnished voltage and load requirements furnished by the
bidder;
(xi) Test at the owners expense all lines and trunks for continuity,
leakage and loop resistance and ensure that all lines and trunks are
suitable for operation with the central office and remote terminal
equipment specified;
(xii) Make alterations and repairs to buildings necessary for proper
installation of material, except to repair damage for which the bidder
or its employees are responsible;
(xiii) Connect outside cable pairs on the distributing frame (those
connected to protectors);
(xiv) Furnish all line, class of service assignment, and party line
assignment information to permit bidder to program the data base memory
within a reasonable time prior to final testing;
(xv) Release for the bidder's use, as soon as possible, such
portions of the
[[Page 478]]
existing plant as are necessary for the proper completion of such tests
as require coordination with existing facilities including facilities
for T1 span lines with properly installed repeaters between the central
office and the remote terminal installations;
(xvi) Make prompt inspections as it deems necessary when notified by
the bidder that the equipment, or any part thereof, is ready for
acceptance;
(xvii) Provide adequate fire protection apparatus at the remote
terminal, including one or more fire extinguishers or fire extinguishing
systems of the gaseous type, that has low toxicity and effect on
equipment;
(xviii) Provide necessary access ports for cable, if underfloor
cabling is selected;
(xix) Install equipment and accessory plant devices mounted external
to the central office building and external to the repeater and other
outside housings including filters, repeater housings, splicing of
repeater cable stubs, externally mounted protective devices and other
such accessory devices in accordance with written instructions provided
by the bidder; and
(xx) Make all cross connections (at the MDF or Intermediate
Distribution Frame IDF) between the physical trunk or carrier equipment
and the central office equipment unless otherwise specified in appendix
A of this section.
(3) Responsibilities of bidder. The bidder shall:
(i) Allow the owner and its representatives access to all parts of
the building at all times;
(ii) Obtain the owner's permission before proceeding with any work
necessitating cutting into or through any part of the building structure
such as girders, beams, concrete or tile floors, partitions or ceilings
(does not apply to the installation of lag screws, expansion bolts, and
similar devices used for fastening equipment to floors, columns, walls,
and ceilings);
(iii) Be responsible for and repair all damage to the building due
to carelessness of the bidder's workforce, exercise reasonable care to
avoid any damage to the owner's switching equipment or other property,
and report to the owner any damage to the building which may exist or
may occur during its occupancy of the building;
(iv) Consult with the owner before cutting into or through any part
of the building structure in all cases where the fireproofing or
moisture proofing may be impaired;
(v) Take necessary steps to ensure that all fire fighting apparatus
is accessible at all times and all flammable materials are kept in
suitable places outside the building;
(vi) Not use gasoline, benzene, alcohol, naphtha, carbon
tetrachloride or turpentine for cleaning any part of the equipment;
(vii) Be responsible for delivering the CO and remote terminal
equipment to the sites where they will be needed;
(viii) Install the equipment in accordance with the specifications
for the line concentrator;
(ix) Have all leads brought out to terminal blocks on the MDF (or
IDF if stated in appendix A of this section) and have all terminal
blocks identified and permanently labeled;
(x) Use separate shielded type leads grounded at one end only unless
otherwise specified by the owner or bidder or tip cables meeting RUS
cable crosstalk requirements for carrier frequencies inside the central
office;
(xi) Group the cables to separate carrier frequency, voice
frequency, signaling, and power leads;
(xii) Make the necessary power and ground connections (location as
shown in appendix A of this section) to the purchaser's power terminals
and ground bus unless otherwise stated in appendix A of this section
(ground wire shall be 6 AWG unless otherwise stated);
(xiii) Place the battery in service in compliance with the
recommendations of the battery manufacturer;
(xiv) Make final charger adjustments using the manufacturer's
recommended procedure;
(xv) Run all jumpers, except line and trunk jumpers (those connected
to protectors) unless otherwise specified in appendix A of this section;
(xvi) Establish and update all data base memories with subscriber
information as supplied by the owner until an agreed turnover time;
[[Page 479]]
(xvii) Give the owner notice of completion of the installation at
least one week prior to completion;
(xviii) Permit the owner or its representative to conduct tests and
inspections after installation has been completed in order that the
owner may be assured the requirements for installation are met;
(xix) Allow access, before turnover, by the owner or its
representative, upon request, to the test equipment which is to be
turned over as a part of the delivered equipment, to permit the checking
of the circuit features which are being tested and to permit the
checking of the amount of connected equipment to which the test circuits
have access;
(xx) Notify the owner promptly of the completion of work of the
central office terminals, remote terminals or such portions thereof as
are ready for inspection; and
(xxi) Correct promptly all defects for which the bidder is
responsible.
(4) Information to be furnished by bidder. The bidder shall
accompany its bid with the following information:
(i) Two copies of the equipment list and the traffic calculations
from which the quantities in the equipment list are determined;
(ii) Two copies of the traffic tables from which the quantities are
determined, if other than the Erlang B traffic tables;
(iii) A block diagram of the line concentrator and associated
maintenance equipment will be provided;
(iv) A prescribed method and criteria for acceptance of the
completed line concentrator which will be subject to review;
(v) This special grounding requirements including the recommended
configuration, suggested equipment and installation methods to be used
to accomplish them;
(vi) The special handling and equipment requirements to avoid damage
resulting from the discharge of static electricity (see paragraph
(j)(4)(iii) of this section) or mechanical damage during transit
installation and testing;
(vii) The location of technical assistance service, its availability
and conditions for owner use and charges for the service by the bidder;
and
(viii) The identification of the subscriber loop limits available
beyond the line concentrator.
(5) Installation requirements. (i) All work shall be done in a neat,
workmanlike manner. Equipment frames or cabinets shall be correctly
located, carefully aligned, anchored, and firmly braced. Cables shall be
carefully laid with sufficient radius of curvature and protected at
corners and bends to ensure against damage from handling or vibration.
Exterior cabinet installations for remote terminals shall be made in a
permanent, eye-pleasing manner.
(ii) All multiple and associated wiring shall be continuous, free
from crosses, reverses, and grounds and shall be correctly wired at all
points.
(iii) An inspection shall be made by the owner or its
representatives prior to performing operational and performance tests on
the equipment, but after all installing operations which might disturb
apparatus adjustments have been completed. The inspection shall be of
such character and extent as to disclose with reasonable certainty any
unsatisfactory condition of apparatus or equipment. During these
inspections, or inspections for apparatus adjustments, or wire
connections, or in testing of equipment, a sufficiently detailed
examination shall be made throughout the portion of the equipment within
which such condition is observed, or is likely to occur, to disclose the
full extent of its existence, where any of the following conditions are
observed:
(A) Apparatus or equipment units failing to compare in quantity and
type to that specified for the installation;
(B) Apparatus or equipment units damaged or incomplete;
(C) Apparatus or equipment affected by rust, corrosion or marred
finish; and
(D) Other adverse conditions resulting from failure to meet
generally accepted standards of good workmanship.
(6) Operational tests. (i) Operational tests shall be performed on
all circuits and circuit components to ensure their proper functioning
in accordance with appropriate explanation of the operation of the
circuit.
[[Page 480]]
(ii) All equipment shall be tested to ensure proper operation with
all components connected in all possible combinations and each line
shall be tested for proper ring, ring trip and supervision.
(iii) All fuses shall be verified for continuity and correct rating.
Alarm indication shall be demonstrated for each equipped fuse position.
An already failed fuse compatible with the fuse position may be used.
(iv) Each alarm or signal circuit shall be checked for correct
operation.
(v) A sufficient quantity of locally originating and incoming calls
shall be made to demonstrate the function of the line concentrator
including all equipped transmission paths. When intra-link calling is
supplied, all intra-link transmission paths shall be demonstrated.
(7) Acceptance tests and data required. (i) Data shall be supplied
to the owner by the bidder in writing as a part of the final documents
in closing out the contract as follows:
(A) A detailed cross connect drawing of alarm to power board,
central office battery to physical trunks or carrier system, wiring
options used in terminals, channels, filters, repeaters, etc., marked in
the owner's copy of the equipment manual or supplied separately;
(B) The measured central office supply voltages applied to the
equipment terminals or repeaters at the time the jack and test point
readings are made and ac supply voltages where equipment is powered from
commercial ac sources;
(C) A list of all instruments, including accessories, by
manufacturer and type number, used to obtain the data; and
(D) The measurements at all jack or test points recommended by the
manufacturer, including carrier frequency level measurements at all
carrier terminals and repeaters where utilized.
(ii) Data in the form of a checklist or other notations shall be
supplied showing the results of the operational tests.
(iii) The bidder shall furnish to the owner a record of the battery
cell or multicell unit voltages measured at the completion of the
installation of the switching system before it is placed in commercial
service. This is not required at a site where the owner furnishes dc
power.
(8) Joint inspection requirements. (i) The bidder shall notify the
owner in writing at least one week before the date the complete system
will be ready for inspection and tests. A joint inspection shall be made
by the bidder and the owner (or owner's engineer) to determine that the
equipment installation is acceptable. The inspection shall include
physical inspection, a review of acceptance test data, operational
tests, and sample measurements.
(A) The owner shall review the acceptance test data and compare it
to the requirements of this section.
(B) Sample measurements shall be made on all systems installed under
this contract. Test methods should follow procedures described in
paragraph (g)(5) of this section.
(C) A check shall be made of measured test point and jack readings
for compliance with the manufacturer's specifications. This applies also
to channels, terminals, carrier frequency repefault locating circuits.
(ii) In the event that the measured data or operational tests show
that equipment fails to meet the requirements quirements of this
section, the deficiencies are to be resolved as set forth in Article II
of the 397 Special Equipment Contract. (Copies are available from RUS,
room 0174, U.S. Department of Agriculture, Washington, DC 20250-1500.)
The reports of the bidder and the owner shall be detailed as to
deficiencies, causes, corrective action necessary, corrective action to
be taken, completion time, etc.
(The information and recordkeeping requirements of this section have
been approved by the Office of Management and Budget (OMB) under the
control number 0572-0059.)
Appendix A to Sec. 1755.397--Specification for Line Concentrator
Detailed Equipment Requirements
(Information To Be Supplied by Owner)
Telephone Company (Owner)
Name:___________________________________________________________________
Location:_______________________________________________________________
Number of LC's Required: --------
Line Concentrator Locations:
[[Page 481]]
------------------------------------------------------------------------
No. of Central
Location Lines Office
------------------------------------------------------------------------
........... ...........
........... ...........
........... ...........
........... ...........
------------------------------------------------------------------------
1. General
1.1 Notwithstanding the bidder's equipment lists, the equipment and
materials furnished by the bidder must meet the requirements of
paragraphs (a) through (p) of this section, and this appendix A.
1.2 Paragraph (a) through (p) of this section cover the minimum
general requirements for line concentrator equipment.
1.3 Paragraph (q) of this section covers the requirements for
installation, inspection and testing when such service is included as
part of the contract.
1.4 This appendix A covers the technical data for application
engineering and detailed equipment requirements insofar as they can be
established by the owner. This appendix A shall be filled in by the
owner.
1.5 Appendix B of this section covers detailed information on the
line concentrator equipment, information on system reliability and
traffic capacity as proposed by the bidder. Appendix B of this section
is to be filled in by the bidder and must be presented with the bid.
Office Name
(By Location)___________________________________________________________
LC Designation__________________________________________________________
2. Number of Subscriber Lines
------------------------------------------------------------------------
Wired
Equipped only
------------------------------------------------------------------------
Single-Party........................................ ........ ........
Pay Station (Type:--------)......................... ........ ........
Other (Describe:--------)........................... ........ ........
Total......................................... ........ ........
------------------------------------------------------------------------
3. Loop Resistance
3.1 Number of non-pay station lines having a loop resistance,
including the telephone set as follows:
3.1.1 For physical trunks between the remote and the office units,
the loop resistance is to include the resistance of the trunk.
------------------------------------------------------------------------
No. of
lines
------------------------------------------------------------------------
1200-1900 ohms............................................. ...........
1901-3200 ohms............................................. ...........
3201-4500 ohms............................................. ...........
------------------------------------------------------------------------
3.1.2 Number of pay station lines having a loop resistance,
excluding the telephone set, greater than:
------------------------------------------------------------------------
No. of
lines
------------------------------------------------------------------------
1200 ohms (Prepay)......................................... ...........
1000 ohms (Semi-Postpay)................................... ...........
------------------------------------------------------------------------
When physical trunks are used, these resistances include that of the
facility between the CO and the remote.
3.1.3 Range extension equipment, if required, is to be provided:
-------- By Bidder
-------- By Owner
(Quantity and Type)_____________________________________________________
________________________________________________________________________
4. Traffic Data
4.1 Average combined originating and terminating hundred call
seconds (CCS) per line in the busy hour:
------ CCS/Line. (Assume originating & terminating equal.)
4.2 Percent Intra-Calling --------
4.3 Total Busy Hour Calls --------
5. TYPE or RINGING
5.1 Frequency No. 1. 2. 3. 4.
Frequency (Hz).......................... ...... ...... ...... ......
Max. No. of Phones/Freq................. ...... ...... ...... ......
5.2 Minimum ringing generator capacity to be supplied shall be
sufficient to serve -------- lines (each frequency).
6. Central Office Equipment Interface
6.1 COE will be:
6.1.1 COE Manufacturer
________________________________________________________________________
Type____________________________________________________________________
Year____________________________________________________________________
Generic_________________________________________________________________
6.1.2 -------- See digital central office specification for the
switchboard at -------------------- .
6.2 Interface will be:
6.2.1 -------- Line Circuit(s)
6.2.2 -------- Direct Digital Interface
6.2.3 -------- Other (Describe)
________________________________________________________________________
________________________________________________________________________
6.3 Mounting rack for line concentrator furnished by:
-------- Bidder
-------- Owner
(Specify width and height of rack available) (Width) (Height)
6.4 Equipment to be installed in existing building:
-------- Yes (Attach detailed plan)
-------- No
7. Transmission Facilities
7.1 Transmission facilities between the central office and remote
terminals shall be:
[[Page 482]]
7.1.1 Type:
-------- VF Carrier Derived Circuits
-------- Digital Span Line (DS1)
-------- Other
________________________________________________________________________
(Attach a layout of the transmission facilities between the central
office and the remote terminals describing transmission and
signaling parameters, routing and resistance where
applicable.)
7.1.2 Utilizes physical plant
-------- Cable Pairs (Existing/New)
-------- Other
________________________________________________________________________
Note: Unless otherwise stated, physical plant will be supplied by
the owner.
7.1.3 Terminal equipment for transmission facility to be supplied
by:
-------- Owner
-------- Bidder
7.1.3.1 Carrier e/w voice terminations -------- Yes -------- No
Manufacturer and type___________________________________________________
Central office voice terminations Equipped --------, Wired Only --------
7.1.3.2 Digital span line (DS1) supplied by
-------- Owner
-------- Bidder
Manufacturer and Type___________________________________________________
7.1.3.3 Number of repeaters (per span line) --------
7.1.3.4 Diverse (alternate) span line routing required
-------- Yes (Describe in Item 11) -------- No
7.1.3.5 Span line terminations only -------- Yes -------- No
7.1.3.6 Span line power required (CO and Remote Terminals) --------
Yes -------- No
7.1.3.7 Physical facility between CO and remote Loop Resistance --
------ ohms, Length -------- meters
8. Power Equipment Requirements
8.1 Central Office Terminal
8.1.1 Owner-furnished -48 volt dc power -------- Yes -------- No
8.1.2 Other (Describe)
________________________________________________________________________
8.1.3 Standby power is available -------- Yes -------- No
8.2 Remote Terminal
8.2.1 Owner-furnished -48 vdc power -------- Yes -------- No
8.2.2 Bidder-furnished power supply -------- Yes -------- No
8.2.3 AC power available at site:
-------- 110 vac, 60 Hz, single-phase
-------- Other (Describe in Item 11)
8.2.4 A battery reserve of -------- busy hours shall be provided
for this line concentrator terminal when it reaches -------- lines at
the traffic rates specified.
8.2.5 Batteries supplied shall be:
-------- Lead Calcium
-------- Stabilized Electrolyte
-------- Sealed Lead Acid
-------- Other (Describe in item 11)
8.2.6 Standby power is available -------- Yes -------- No
9. Remote Terminal
9.1 Mounting
9.1.1 -------- Outside Housing (To be furnished by bidder)
9.1.2 -------- Concrete Slab to be furnished by owner (Bidder to
supply construction details after award.)
9.1.3 -------- Manhole, environmentally controlled (Describe in
Item 11)
9.1.4 -------- Pedestal Mounting
9.1.5 -------- Pole Mounting (Owner-furnished installed pole)
9.1.6 -------- Prefab Building (Owner-furnished site)
9.2 Equipment is to be installed in an existing building.
-------- Yes -------- No
(Attach detailed plan.)
9.3 Other (Describe)
________________________________________________________________________
________________________________________________________________________
10. Alternates
11. Explanatory Notes
Appendix B to Sec. 1755.397--Specification for Line Concentrators
Detailed Requirements; Bidder Supplied Information
Telephone Company (Owner)
Name:___________________________________________________________________
Location:_______________________________________________________________
Line Concentrator Equipment Locations
Central Office Terminal:________________________________________________
Remote Terminal:________________________________________________________
1. General
1.1 The equipment and materials furnished by the bidder must meet
the requirements of paragraphs (a) through (p) of this section.
1.2 Paragraph (a) through (p) of this section cover the minimum
general requirements for line concentrator equipment.
1.3 Paragraph (q) of this section covers requirements for
installation, inspection and testing when such service is included as
part of the contract.
1.4 Appendix A of this section covers the technical data for
application engineering and detailed equipment requirements insofar as
they can be established by the owner. Appendix A of this section is to
be filled in by the owner.
1.5 This appendix B covers detailed information on the line
concentrator equipment, information as to system reliability and
[[Page 483]]
traffic capacity as proposed by the bidder. This appendix B shall be
filled in by the bidder and must be presented with the bid.
2. Performance Objectives
2.1 Reliability (See paragraph (c) of this section)
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
2.2 Busy Hour Load Capacity and Traffic Delay (See Paragraph (g) of
this section)
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
3. Equipment Quantities Dependent on System Design
3.1 Transmission Facilities between the Central Office and Remote
Terminals
------------------------------------------------------------------------
Quantity Quantity
Type equipped wired only
------------------------------------------------------------------------
........... ...........
........... ...........
........... ...........
------------------------------------------------------------------------
4. Power Requirements
4.1 Central Office Terminal
Voltage_________________________________________________________________
Current Drain (Amps) Normal --------, Peak --------
Fuse Qty --------, Size --------, Type --------
Heat Dissipation (BTU/Hr.) --------
________________________________________________________________________
4.2 Remote Terminal
AC or DC________________________________________________________________
Voltage_________________________________________________________________
Current Drain (Amps) Normal --------, Peak --------
Fuse Qty --------, Size --------, Type --------
Heat Dissipation (BTU/Hr.) --------
________________________________________________________________________
Power required for heating or cooling equipment in remote bidder-
furnished housing
________________________________________________________________________
________________________________________________________________________
5. Temperature and Humidity Limitations
5.1 Temperature
------------------------------------------------------------------------
Central
office Remote*
------------------------------------------------------------------------
Maximum deg.F ( deg.C)...................... ........... ...........
Minimum deg.F ( deg.C)...................... ........... ...........
------------------------------------------------------------------------
5.2 Relative Humidity
------------------------------------------------------------------------
Central
office Remote*
------------------------------------------------------------------------
Maximum....................................... ........... ...........
Minimum....................................... ........... ...........
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* Show conditions outside bidder-furnished housing.
6. Explanatory Notes
[60 FR 44729, Aug. 29, 1995]