Specifications

C-16
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
EIA-530 Connections
The EIA-530 adapter cable is available in DTE mode only. The router end of the EIA-530 adapter cable
is a high-density 60-pin plug. The network end of the adapter cable is a standard DB-25 plug commonly
used for EIA/TIA-232 connections. Figure C-9 shows the DB-25 connector at the network end of the
adapter cable.
Figure C-9 EIA-530 Adapter Cable Connector
Table C-15 X.21 Adapter Cable Signals (DCE)
DCE Cable (CAB-X21FC=)
Router End, HD
1
60-Position Plug
1. HD = high-density.
Network End,
DB-15 Receptacle
Signal Pin Pin Signal
Shield ground 46 – 1 Shield ground
RxD/TxD+ 11 —>2 Transmit+
RxD/TxD– 12 —>9 Transmit–
CTS/RTS+ 9 —>3 Control+
CTS/RTS – 10 —>10 Control–
TxD/RxD+ 28 <— 4 Receive+
TxD/RxD– 27 <— 11 Receive–
RTS/CTS+ 1 <— 5 Indication+
RTS/CTS– 2<— 12 Indication–
TxC/RxC+ 26 <— 6 Timing+
TxC/RxC – 25 <— 13 Timing–
Circuit ground 15 – 8 Circuit ground
Ground
Mode_2
48
47
––Shorting group
Ground
Mode_DCE
51
52
–––
Table C-16 EIA-530 DTE Adapter Cable Signals (CAB-530MT=)
Router End, HD
1
60-Position Plug
Network End,
DB-25 Plug
Signal Pin Pin Signal
Shield ground 46 – 1 Shield ground
DTE
H1615a