800 Co-Bri Module; Equipment And Operation; Co-Bri Module Specifications - AT&T MERLIN LEGEND Reference

Equipment and Operation

800 CO-BRI Module

The 800 CO-BRI module serves as the Integrated Services Digital Network
(ISDN) Basic Rate, two-wire U-interface between the MERLIN LEGEND system
and the central office (CO) Basic Rate Interface (BRI) lines (see Figure 2-1).
The 800 CO-BRI module consists of eight ports. Each port supports a BRI line
(also called a Digital Subscriber Line or DSL). Each DSL maps to two MERLIN
LEGEND lines and supports two Directory Numbers, for a total of 16 lines or
Directory Numbers per 800 CO-BRI module (see Figure 2-1). Up to five 800 CO-
BRI modules can exist in a system (80 lines). The system supports a maximum
of two 100D modules.
Because of limitations with the 391A, 391A 1, and 391A2 power supplies,
the number of 800 CO-BRI modules plus 100D modules in a carrier cannot
exceed three.
Each DSL operates at 160 kbps with the following allocation:
Two 64-kbps B-channels
One 16-kbps D-channel
16 kbps for framing, maintenance, and synchronization
Table 2-1 shows the basic specifications for the 800 CO-BRI module.
Table 2-1.800 CO-BRI Module Specifications
Module
800 CO-BRI
Line/
Trunk Type
BRI
Capacity: 8 ports support 16 lines
Signaling:
Loop range:
Specifications
BRI
3.4 miles

800 CO-BRI Module

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