Nortel Networks Passport 4400 - Manual (Page 61)

Ethernet Base Module and Interface Modules Passport 4400 Hardware Installation Manual
5-3
WAN Serial Interface Module
The WAN serial interface 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 modes. Both Port 2 (MPANL port) and Port 3 (WAN Backup port) can support
the WAN serial interface module.
Figure 5-4. Front and Back View of the WAN Serial Interface Module
Note: The interface module must be inserted into the unit with
the component side facing down.
Rear View