3Com 3C13886 Installation Guide - Page 49

II. Interface cable of E&M modules, E&M modules of 3Com 5000 Family Routers support Bell I, II

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3Com Router Module Guide Chapter 3 Multifunctional Interface Modules 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: PBX E detect 7 M on-hook Router on-hook off-hook -48 V off-hook M on-hook T0 2 E T0 6 detect -48 V -48 V 4- wire voice signal R0 R0 3 T1 T1 5 4- wire voice signal R1 R1 4 Figure 3-10 E&M interface cable (Bell V 4-wire) 3-5

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3Com Router Module Guide
Chapter 3
Multifunctional Interface Modules
3-5
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
PBX
Router
detect
M
E
7
on-hook
off-hook
on-hook
-48 V
on-hook
detect
M
E
2
off-hook
4- wire
6
T0
R0
T1
T1
R1
R1
R0
T0
4
5
3
4- wire
voice signal
-48 V
voice signal
Figure 3-10
E&M interface cable (Bell V 4-wire)