X.21 interfaces (X4X.21 card)
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Purpose
X.21 tributaries can be connected to these interfaces. This option card can be regarded
as X.21 Data Circuit Equipment (DCE).
Connector data
The X.21 connectors which are located on the X4X.21 option card are 15-pin SUB-D
female connectors.
Table 4-16 Pin assignment (X.21 cables)
Point on Connector Signal Name Description
1 GND Shielded ground
2 TX N Transmit-Data Negative
3 CD N Control-Data Negative
4 RX N Receive-Data Negative
5 ID N Indication-Data Negative
6 TD N Timing-Data Negative
7 nc Not connected
8 GND Signal ground
9 TX P Transmit-Data Positive
10 CD P Control-Data Positive
11 RX P Receive-Data Positive
12 ID P Indication-Data Positive
13 TD P Timing-Data Positive
14 nc Not connected
15 nc Not connected
Cable connection
Please connect the X.21 cables as shown in the figure below.
Figure 4-46 X.21 connector
System cabling
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365-312-802R7.2
Issue 4, June 2007
Alcatel-Lucent - Proprietary
See notice on first page
4-45
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