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5. Equipment installation and Preparation
5.1. Installation preparation
Make sure that the E1 line cable matches the equipment model connected to it.
The default effective interface is 75Ω BNC. If user wants to use BALANCED
interface, please set the 6
Usage of E1 balanced signal line
Definitions of 120Ω balanced interface are as follows:
PIN
1
Title
TD+
Definition Output+
When 120Ω balanced interface connects with other devices, it is required to make sure of
the pin definition of other devices. The pin connection method of twisted-pair on both ends
is shown as follow:
RC series converter BALANCE-RJ45
interface
TD
TD
RD
RD
Attention: When connecting the twisted-pair, TD and TD should be twisted in pairs, and
so do RD
and RD .
5.2. Cautions when the power is on
Hot-swapping V.35 interface is forbidden
It is suggested that the protecting ground (middle of the adapter) be connected first
when using DC –48V device. Note that inverse connection of positive and negative
th
group of dip-switches on the bottom.
st
1
pin
2
3
Not in
TD-
use
Output-
Input+
th
8
pin
4
5
Not in
RD+
RD-
Input-
E1
transmission
Signal output
Signal output
Signal input
Signal input
20
6
7
Not in
Not in
use
use
use
device
balanced
8
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