X.21 Cable
B-12 Communications Server Hardware Installation Guide
X.21 Cable
Table B-7 gives pinout information for an X.21 cable with DB-25 and DB-15 connectors.
Pins not listed have no connection.
This cable is not supplied, but can be ordered from Lucent. Specify product code
CBL-X21-6.
Ta b l e B - 7 Synchronous X.21 Cable
PortMaster
Port W1
V. 3 5
DB-25
Pin Name Definition
X.21
DB-15
Pin Name
7 B SGND Signal Ground 8 SGND
10 Control B
4 C RTS Request to Send 3 Control A
5DCTSClear to Send
8 F CD Carrier Detect 5 Indicate A
3 R RXA Receive Data 4 RXA
16 T RXB Receive Data 11 RXB
17 V RX CLKA Receive Timing 6 CLKA
15 Y TX CLKA Send Timing
19 X RX CLKB Receive Timing 13 CLKB
13 AA TX CLKB Send Timing
2 P TXD A Transmit Data 2 TXA
14 S TXD B Transmit Data 9 TXA
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