Specifications

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Channelized and Electrical Interface Line Card Installation and Configuration
78-16417-02
Cabling and Specifications
Building Your Own Cables
You can build your own cables for the T3 connectors on your line card by using the cable components
listed in Table 11. All three cables have an SMB connector at one end to connect to the line card. The
two SMB-to-BNC cables in Table 11 differ only in that one terminates in a male BNC connector, while
the other terminates in a female BNC connector. You can use the third cable for directly connecting two
closely spaced line cards back-to-back. These cables have SMB connectors on both ends.
Note SMB-BNC 10-foot (3.048-meter) cables will not work for a back-to-back configuration, or
SMB serial-to-SMB serial port configuration, unless you have an 75-ohm adapter that
attaches the two BNC connectors together. For back-to-back configuration, you will need
to order a specially built cable. Table 11 provides cable connector specifications.
You can order the SMB-to-BNC cables in pairs from Cisco as 2CBLE-SMB-BNC-F female or
2CBLE-SMB-BNC-M male BNC terminations, respectively. Cisco does not sell the SMB-to-SMB
cable.
Caution Cisco assumes no responsibility for system operation with adaptor cables not supplied by Cisco. You
are responsible for ensuring that any custom-built cables meet all the applicable compliance
requirements as outlined in the “Electromagnetic Compatibility Regulatory Statements” section on
page 74.
Cable Attenuation
T3 systems are designed for cable lengths of 450 feet (137 meters) between the transmitter and the
DSX-3 demarcation point where the standard pulse mask must be met. From the DSX-3 point, another
run of 450 feet (137 meters) is allowed to the receiver, making a total of 900 feet (274 meters) between
transmitter and receiver. This limitation is due to signal attenuation in the cable.
Although the American National Standards Institute (ANSI) standard T1.404-1994 stipulates the
Western Electric or equivalent 728A SMB cable, it has been replaced by the Lucent (formerly AT&T)
734A cable. Cisco tested more than 900 feet (274 meters) of 734A SMB cable from transmitter to
receiver including the SMB-to-BNC adapter cables to verify high signal attenuation.
Table 11 Cable Connector Specifications
Cable Configuration Line Card End Remote End RG-179 Cable
SMB-to-BNC Male ITT-Cannon
051-124-9859-C9A
Radial R142076000
(or equivalent)
Amp 41360-4
(or equivalent)
Double-shielded
Harbour Ind. H6233-1
(or equivalent)
SMB-to-BNC Female ITT-Cannon
051-124-9859-C9A
Amp 413760-8
(or equivalent)
Double-shielded
Harbour Ind. H6233-1
(or equivalent)
SMB-to-SMB
Back-to-Back
ITT-Cannon
051-124-9859-C9A
ITT-Cannon
051-124-9859-C9A
Double-shielded
Harbour Ind. H6233-1
(or equivalent)