Sec. 68.318  Additional limitations.

    (a) General. Registered terminal equipment for connection to those 
services discussed below must incorporate the specified features.
    (b) Registered terminal equipment connecting to 1.544 Mbps digital 
service. (1) Until December 18, 1989, terminal equipment connecting to 
1.544 Mbps service shall contain circuitry that assures continuity of 
output signal. This equipment shall assure that either the outgoing 
signal meets the minimum pulse density requirement below or one of the 
specified keep alive signals is transmitted. Power to operate this 
equipment may come from the line or premises power. Line powered 
functioning shall be achieved as follows: A direct current connection 
shall be provided between the simplexes of the transmit and receive 
pairs. The line power to operate the equipment which assures continuity 
of the output signal shall be derived from the direct current connection 
between the simplexes of the transmit and receive pairs. For circuits 
placed in service prior to February 18, 1988, the telephone company will 
drive 60 mA through this connection from a constant current source. With 
60 mA between the transmit and receive pairs, the voltage drop between 
the transmit and receive pairs shall not exceed 67 volts. The minimum 
acceptable average pulse density is 0.125. The maximum acceptable length 
of a continuous sequence of ``zeros'' is 80

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pulse positions. The keep alive signal inserted when the pulse density 
drops too low shall be one of the following:
    (i) Type 1 Keep Alive Signal. This signal is a consecutive sequence 
of all ``ones''.
    (ii) Type 2 Keep Alive Signal. This signal is a sequence of 193-bit 
frames consisting of a framing bit plus 192-bit sequence of consecutive 
``ones''. The framing bit executes the following repetitive pattern 
every 12 frames:

                         1 0 0 0 1 1 0 1 1 1 0 0

    (iii) Type 3 Keep Alive Signal. This signal sequence is the 
regenerated received signal connected to the transmit port through a 
loopback circuit.
    (2) For circuits placed in service on or after February 18, 1988, 
and for all circuits as of December 18, 1989, whenever such circuits 
were placed in service, the telephone company is not required to provide 
line power to operate continuity of output functions in terminal 
equipment connecting to 1.544 Mbps service. As of December 18, 1989, 
such terminal equipment is not required to contain continuity of output 
capability, provided, however, that telephone companies by tariff may 
require that such equipment contain the continuity of output capability 
described in this paragraph up to December 18, 1992. Applications for 
registration of terminal equipment for connection to 1.544 Mbps service 
which does not contain continuity of output capability shall be accepted 
as of December 18, 1988, but eligibility for connection to 1.544 Mbps 
service shall be governed by this paragraph.
    (c) Registered terminal equipment connecting to the public switched 
network--(1) Limitation on automatic dialing. Automatic dialing to a 
particular number must cease after 15 successive attempts. This rule 
does not apply to manually activated dialers which dial a number just 
once following each activation.
    (2) Line seizure by automatic telephone dialing systems. Automatic 
telephone dialing systems which deliver a recorded message to the called 
party must release the called party's telephone line within 5 seconds of 
the time notification is transmitted to the system that the called party 
has hung up, to allow the called party's line to be used to make or 
receive other calls.
    (3) Telephone facsimile machines; identification of the sender of 
the message. It shall be unlawful for any person within the United 
States to use a computer or other electronic device to send any message 
via a telephone facsimile unless such message clearly contains, in a 
margin at the top or bottom of each transmitted page or on the first 
page of the transmission, the date and time it is sent and an 
identification of the business, other entity, or individual sending the 
message and the telephone number of the sending machine or of such 
business, other entity, or individual. The telephone number provided may 
not be a 900 number or any other number for which charges exceed local 
or long distance transmission charges. Telephone facsimile machines 
manufactured on and after December 20, 1992, must clearly mark such 
identifying information on each transmitted message. Facsimile modem 
boards manufactured on and after December 13, 1995, must comply with the 
requirements of this section.
    (d) Requirement that registered equipment allow access to common 
carriers. Any equipment or software manufactured or imported on or after 
April 17, 1992, and installed by any aggregator shall be technologically 
capable of providing consumers with access to interstate providers of 
operator services through the use of equal access codes. The terms used 
in this paragraph shall have the meanings defined in Sec. 64.708 of this 
chapter (47 CFR 64.708).

[49 1997 FR 48726 , Dec. 14, 1984, as amended at  51 FR 951 , Jan. 9, 1986;  52 FR 43077 , Nov. 9, 1987;  52 FR 49413 , Dec. 31, 1987;  53 FR 1103 , Jan. 15, 
1988;  56 FR 18524 , Apr. 23, 1991;  56 FR 56166 , Nov. 1, 1991;  57 FR 48336 , Oct. 23, 1992;  60 FR 42069 , Aug. 15, 1995]

                     Subpart E--Complaint Procedures