Connecting Interface Cable - 3Com 3C13886 - Router OC-3 ATM SML Flexible Interface Card Installation Manual

3Com Router Module Guide
Table 3-3 Pinouts of E&M interface cable (Bell V 4-wire)
RJ-45 Pin
1
2
3
4
5
6
7
8
Note:
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.
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.

3.1.6 Connecting Interface Cable

Router side
RJ-45 interface signal
SB (negative power supply)
E
RING0
RING1
TIP1
TIP0
M
SG (negative power supply
ground)
Chapter 3 Multifunctional Interface Modules
Signal at switch side (Bell V 4-wire)
-
M
RING0
RING1
TIP1
TIP0
E
-
3-6