E1/G.703 Linear Signal Connection - Lanex TM-77 Operating Manual

4.4

E1/G.703 linear signal connection

4.4.1 TM-77 and MD-77
E1/G.703 interface input and output signals of TM-77 and MD-77 devices are transmitted
via two screened symmetric cables of 120 Ω impedance or one double screened cable of the
same impedance.
The following rules should be observed to meet the requirements concerning noise
emissions. Symmetric cables should be connected using DSUB-25 plug equipped with a metal or
metalized casing (shield) and the cable screen should be connected to the casing over the whole
circumference. It is insufficient just to connect the screen to the "structural earth" terminals on
the E1/G.703 120Ω interface socket.
The E1/G.703 120 Ωlinear module socket outputs are described in Table 5.
Table 5. Description of TM-77 and MD-77 E1/G.703 120Ω interface outputs
IOA77-1F
4 E1/G.703 P
X LESIOCHRONOUS
O
PERATING
Pin Description of outputs
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
16
M
ULTIPLEXER
M
ANUAL
GND
RX_B4
TX_B4
RX_A3
TX_A3
GND
RX_B2
TX_B2
RX_A1
TX_A1
GND
GND
Not connected
RX_A4
TX_A4
GND
RX_B3
TX_B3
RX_A2
TX_A2
GND
RX_B1
TX_B1
GND
Not connected
May 2007