3Com 3C13886 - Router OC-3 ATM SML Flexible Interface Card Installation Manual page 49

3Com Router Module Guide
II. Interface cable of E&M modules
E&M modules of 3Com 5000 Family Routers support Bell I, II, III, V switches, and
2-wire & 4-wire voice signals.
It is recommended to use Bell V 4-wire voice signal to communicate with the Router in
practice.
The sequence of E&M RJ-45 pins is shown in the following figure, numbered 1 to 8
from left to right:
Figure 3-9 Sequence of RJ-45 pins
When connection is made in Bell V 4-wire mode, the pinouts of RJ-45 receptacles at
router side and at the switch side are shown in the following figure:
-48 V
4- wire
voice signal
Figure 3-10 E&M interface cable (Bell V 4-wire)
PBX
E
detect
M
off-hook
on-hook
T0
R0
T1
R1
Chapter 3 Multifunctional Interface Modules
7
M
on-hook
2
E
6
T0
3
R0
5
T1
4
R1
3-5
Router
on-hook
off-hook
-48 V
-48 V
detect
4- wire
voice signal