Serial interfaces cables and converters scheme  > Cisco pinouts
used in the Cisco 7000 family, Cisco 4000 series, Cisco 3600 series, Cisco 2500 series, Cisco 1600 series, Cisco access servers, and AccessPro PC cards
60 Pin Signal Description Direction 25 Pin Signal
J1-50
J1-51
J1-52
MODE_0
GND
MODE_DCE
Shorting group - - -
J1-46 Shield GND Single - J2-1 Shield GND
J1-41
Shield
TxD/RxD
-
Twisted pair no. 5 -->
-
J2-2
Shield
TxD
-
J1-36
Shield
RxD/TxD
-
Twisted pair no. 9 <--
-
J2-3
Shield
RxD
-
J1-42
Shield
RTS/CTS
-
Twisted pair no. 4 -->
-
J2-4
Shield
RTS
-
J1-35
Shield
CTS/RTS
-
Twisted pair no. 10 <--
-
J2-5
Shield
CTS
-
J1-34
Shield
DSR/DTR
-
Twisted pair no. 11 <--
-
J2-6
Shield
DSR
-
J1-45
Shield
Circuit GND
-
Twisted pair no. 1 -
-
J2-7
Shield
Circuit GND
-
J1-33
Shield
DCD/LL
-
Twisted pair no. 12 <--
-
J2-8
Shield
DCD
-
J1-37
Shield
TxC/NIL
-
Twisted pair no. 8 <--
-
J2-15
Shield
TxC
-
J1-38
Shield
RxC/TxCE
-
Twisted pair no. 7 <--
-
J2-17
Shield
RxC
-
J1-44
Shield
LL/DCD
-
Twisted pair no. 2 -->
-
J2-18
Shield
LTST
-
J1-43
Shield
DTR/DSR
-
Twisted pair no. 3 -->
-
J2-20
Shield
DTR
-
J1-39
Shield
TxCE/TxC
-
Twisted pair no. 6 -->
-
J2-24
Shield
TxCE
-

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

Any pin not referenced is not connected. See RS232 interface details also.

Cisco Part#: CAB-232MT, # 72-0793-01

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Cisco EIA/TIA-232 (RS-232) DTE cable visual pinout:
Cisco EIA/TIA-232 (RS-232) DTE cable diagram
click to enlarge
Source(s) of this and additional information: Cisco Systems, Inc.
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