Nortel Networks Passport 4400 - Manual (Page 75)

7-1
Data Modules
7
High-speed Data Module
There are two versions of the High-speed Data Module (HDM), one with four ports
and one with eight ports. The High-speed Data Module provides additional port
capability, identical to port 1 on the base module. The module supports RS-232,
V.35, V.36, and X.21 interfaces, determined by the cable used. The module can
support both DTE and DCE mode.
Figure 7-1. High-speed Data Module
Back
4 port
8 port
Module switch
Rear View
Stacking connectors
Indicators