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Procedure 6-3 (continued)
Connecting the interface cables
Action
Step
Connect to the customer equipment
1
Table 6-5
Input pin assignments for twisted-pair interface cable
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
2
Action
Connect the twisted-pair wires of the interface cable to the customer
equipment as shown in
connection.
Signal Description
Case Gnd
Reserved
TX Tributary 1 Tip
TX Tributary 1 Ring
RX Tributary 1 Tip
RX Tributary 1 Ring
RS 485+
TX Tributary 2 Tip
TX Tributary 2 Ring
RX Tributary 2 Tip
RX Tributary 2 Ring
Programmable Alarm Relay
(NC)
RS 485-
TX Tributary 3 Tip
TX Tributary 3 Ring
RX Tributary 3 Tip
Record the wire colors for each pin in the columns in
wires for easy identification at the DS1/E1 equipment end.
—continued—
Installation and commissioning procedures 6-15
Table 6-5
(use a twisted-pair for each Tx and Rx
Pin
Signal Description
17
RX Tributary 3 Ring
18
Summary Alarm relay (NC)
19
TX Tributary 4 Tip
20
TX Tributary 4 Ring
21
RX Tributary 4 Tip
22
RX Tributary 4 Ring
23
Alarm relay Common (CC)
24
DC Power Conn#1
25
RS422 RX+
26
RS422 RX-
27
DC Power Conn#2
28
RS422 TX-
29
RS422 TX+
30
DC Power Conn#2
31
DC Power Conn#1
User guide NTXXXXXX Rel 3.0 Draft October 2000
Table 6-5
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