Specifications
Pin Allocations
BRI connections require an 8-pin modular jack (RJ-45) on a shielded, twisted pair cable.
Straight-through cables are required for “T” interfaces (to CO) and crossover cables (with 3 & 4
and 5 & 6 crossed at one end) for “S” interfaces (to Sets).
Table 13: Quad BRI Framer MMC Specifications
Specification Value
Channels 2 B-channels and 1 D-channel per link
Maximum Line Length 1 km (Point-to-Point)
250 m (Point-to-Multipoint) (See Note)
Note: In this table, Point-to-Multipoint (P2MP) refers to a physical P2MP configuration where more
than one BRI set is connected to a single S interface. It does not refer to “logical” P2MP configurations
such as DID trunks. P2MP is available for S interfaces only.
Table 14: Quad BRI Framer Pin Allocation
Pin Number Signal
1–
2 –
3Tx+
4 Rx+
5Rx-
6 TX-
7–
8 –
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