Serial interfaces cables and converters scheme  > Cisco pinouts
This document describes the X.21 cable assembly and pinouts (Data Communications - DCE). Cisco Part#: CAB-X21FC=
60 Pin1 Signal Description Direction 15 Pin Signal
J1-48
J1-47
GND
MODE_2
Shorting group - - -
J1-46 Shield_GND Single - J2-1 Shield GND
J1-28
J1-27
RxD/TxD+
RxD/TxD-
Twisted pair no. 6 -
-
J2-2
J2-9
Transmit+
Transmit-
J1-1
J1-2
CTS/RTS+
CTS/RTS-
Twisted pair no. 1 -
-
J2-3
J2-10
Control+
Control-
J1-11
J1-12
TxD/RxD+
TxD/RxD-
Twisted pair no. 3 -
-
J2-4
J2-11
Receive+
Receive-
J1-9
J1-10
RTS/CTS+
RTS/CTS-
Twisted pair no. 2 -
-
J2-5
J2-12
Indication+
Indication-
J1-24
J1-23
TxC/RxC+
TxC/RxC-
Twisted pair no. 4 -
-
J2-6
J2-13
Timing+
Timing-
J1-15
Shield
Control_GND
-
Twisted pair no. 5 -
-
J2-8
Shield
Control GND
-

Arrows indicate signal direction: - indicates DTE to DCE, and - indicates DCE to DTE.

Any pin not referenced is not connected.

60 pin Cisco DB connector layout
60 pin Cisco DB connector
15 pin Cisco DB connector layout
15 pin Cisco DB connector
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