3Com 3C13886 Installation Guide - Page 50

Table 3-3, Router side, RJ-45 Pin, RJ-45 interface signal, Signal at switch side Bell V 4-wire

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3Com Router Module Guide Chapter 3 Multifunctional Interface Modules Table 3-3 Pinouts of E&M interface cable (Bell V 4-wire) RJ-45 Pin Router side RJ-45 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. 3.1.6 Connecting Interface Cable 3-6

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3Com Router Module Guide
Chapter 3
Multifunctional Interface Modules
3-6
Table 3-3
Pinouts of E&M interface cable (Bell V 4-wire)
Router side
RJ-45 Pin
RJ-45 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:
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