User manual

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 75 Ω BNC. If user wants to use BALANCED
interface, please set the 6
th
group of dip-switches on the bottom.
 Usage of E1 balanced signal line
Definitions of 120 Ω balanced interface are as follows:
1
st
pin 8
th
pin
PIN 1 2 3 4 5 6 7 8
Title
TD+ TD-
Not in
use
RD+ RD-
Not in
use
Not in
use
Not in
use
Definition Output+ Output- Input+ Input-
When 120 Ω 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 E1 transmission device balanced
interface
TD Signal output
TD Signal output
RD Signal input
RD Signal input
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
20