[Code of Federal Regulations]
[Title 47, Volume 5]
[Revised as of October 1, 2003]
From the U.S. Government Printing Office via GPO Access
[CITE: 47CFR80.74]

[Page 31-32]
 
                       TITLE 47--TELECOMMUNICATION
 
                         COMMISSION (CONTINUED)
 
PART 80_STATIONS IN THE MARITIME SERVICES--Table of Contents
 
             Subpart C_Operating Requirements and Procedures
 
Sec.  80.74  Public coast station facilities for a telephony busy signal.

    A ``busy'' signal, when used by a public coast station in accordance 
with the provisions of Sec.  80.111(d), must consist of the transmission 
of a single audio frequency regularly interrupted, as follows:
    (a) Audio frequency: Not less than 100 nor more than 1100 Hertz, 
provided the frequency used for this purpose will not cause auto alarms 
or selective-ringing devices to be operated.

[[Page 32]]

    (b) Rate of interruption: 60 times per minute +-10%.
    (c) Duration of each interruption: 0.5 second +-10%.