3Com Router 5000 and Router 6000 v2.41
Module Guide
Chapter 3
Multifunctional Interface Modules (Router 5000)
3-6
Table 3-3 Pinouts of E&M interface cable (Bell V 4-wire)
Router side
RJ45 Pin RJ45 interface signal Signal at switch side (Bell V 4-wire)
1 SB (negative power supply) -
2 E M
3 RING0 RING0
4 RING1 RING1
5 TIP1 TIP1
6 TIP0 TIP0
7 M E
8 SG (negative power supply
ground)
-
Note:
z Interface cables of Router 2-Port FXS/FXO and Router 4-Port FXS/FXO modules are magnetic loop
lines with a ferrite core at one end. To ensure EMC of the Router, connect the end with ferrite core to
the Router.
z Because it is hard to determine the type of the switch to be connected and its connectors, interface
cables of Router 2 and 4-Port E&M/E&M modules have to be prepared according to the on-spot
conditions or by the user. To ensure the EMC of the Router, install a ferrite core near the connector
of the prepared E&M module interface cable by the router side.