Specifications

C-15
Cisco 7100 Series VPN Router Installation and Configuration Guide
78-6341-03
Appendix C Cable Specifications
Cisco 7120-4T1 and Cisco 7140-8T Cables and Pinouts
X.21 Connections
The router end of all X.21 adapter cables is a high-density 60-pin plug. The network end of the adapter
cable is a standard DB-15 connector. Figure C-8 shows the connectors at the network end of the X.21
adapter cable. X.21 cables are available as either DTE (DB-15 plug) or DCE (DB-15 receptacle). See
Table C-14 and Table C-15 for pinouts.
Figure C-8 X.21 Adapter Cable Connectors
Table C-14 X.21 Adapter Cable Signals (DTE)
DTE Cable (CAB-X21MT=)
Router End, HD
1
60-Position Plug
1. HD = high-density.
Network End,
DB-15 Plug
Signal Pin Pin Signal
Shield ground 46 – 1 Shield ground
TxD/RxD+ 11 —>2 Transmit+
TxD/RxD– 12 —>9 Transmit–
RTS/CTS+ 9 —>3 Control+
RTS/CTS – 10 —>10 Control–
RxD/TxD+ 28 <— 4 Receive+
RxD/TxD– 27 <— 11 Receive–
CTS/RTS+ 1 <— 5 Indication+
CTS/RTS – 2<— 12 Indication–
RxC/TxCE+ 26 <— 6 Timing+
RxC/TxCE– 25 <— 13 Timing–
Circuit ground 15 – 8 Circuit ground
Ground
Mode_2
48
47
––Shorting group
Ground
Mode_DCE
51
52
––Shorting group
1
8
15
9
DCE
DTE
H1346a