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Chapter 9 Starting the system 147
Installation and Maintenance Guide
Table 30 shows the wire connections for a DB15 X.21 adapter cable.
Replacing the cards
Refer to Chapter 20, “Replacing data cards and processing hardware,” on page 261 for instructions
about removing and installing these cards.
Table 30 DB15 X.21 adapter cable
DB26 on
WAN card
Signal
DB15
X.21 cable
DB26 on
WAN card
Signal
DB15
X.21 cable
1 Chassis Ground 1 14 Transmit Data B 9
2 Transmit Data A 2 15
3 Receive Data A 4 16 Receive Data B 11
4 Request to Send A 3 17 Receive Clock A 6
5 Clear to Send A 5 18
6 19 Request To Send B 10
7 Signal Ground 8 20
8 21
9 Receive Clock B 13 22
10 23
11 External Clock B 14 24 External Clock A 7
12 25
13 Clear To Send B 12 26