3Com PathBuilder S21x Installation Manual page 55

V.24 DTE Cable
PathBuilder S21x Switch Cabling
The following table shows the DTE pinouts for the V.24 cable.
Pin
1 Shield/Frame Ground
2 TXD
3 RXD
4 RTS
5 CTS
6 DSR
7 Signal Ground
8 DCD
14 DATA RESTRAINT
15 TRANSMIT CLOCK
16 STANDBY INDICATOR
17 RECEIVE CLOCK
18 EXTERNAL RECEIVE CLOCK or V.54 Loop 3 *
20 DTR
21 V.54 Loop 2
22 (No Connection)
24 EXTERNAL TRANSMIT CLOCK
25 MAKE BUSY
Function/Signal Name
V.24 Cable
B-13