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CAB−232MT and CAB−232FC EIA/TIA−232 Serial
Cable Specifications
Document ID: 46800
Introduction
Prerequisites
Requirements
Components Used
Conventions
EIA/TIA−232 Speed and Distance Limitations
Serial Cable CAB−232MT
EIA/TIA−232 Serial Cable Assembly
EIA/TIA−232 DTE Cable Pinouts
Serial Cable CAB−232FC
EIA/TIA−232 DCE Cable Pinouts (DB−60 to DB−25)
Related Information
Introduction
This document provides the technical specifications for the EIA/TIA−232 serial cables.
Prerequisites
Requirements
There are no specific requirements for this document.
Components Used
This document is not restricted to specific software and hardware versions.
The information in this document was created from the devices in a specific lab environment. All of the
devices used in this document started with a cleared (default) configuration. If your network is live, make sure
that you understand the potential impact of any command.
Conventions
For more information on document conventions, see the Cisco Technical Tips Conventions.
EIA/TIA−232 Speed and Distance Limitations
As with all signaling systems, EIA/TIA−232 signals can travel a limited distance at any given bit rate;
generally, the slower the data rate, the greater the distance.
The table below gives the EIA/TIA−232 speed and distance limitations.
Data Rate (Baud)
Distance (Feet) Distance (Meters)
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2400
200 60
4800
100 30
9600
50 15
19200
50 15
38400
50 15
57600
25 7.6
115200
12 3.7
Serial Cable CAB−232MT
This section presents the cable assembly and pinouts for the CAB−232MT serial cable.
Note: The cable itself identifies the Cisco router as a data terminal equipment (DTE) or data communications
equipment (DCE) device to other devices in the network; for this reason, it is important to select the correct
product number from the table below.
The cable gender for this product (part number 72−0793−01) is Male − Male, mode − DTE.
The CAB−232MT cable is 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. This cable has a male DB−60
connector on the Cisco end and a male DB−25 connector on the network end.
EIA/TIA−232 Serial Cable Assembly
EIA/TIA−232 DTE Cable Pinouts
The table below shows the EIA/TIA−232 DTE cable pinouts (DB−60 to DB−25).
Note: The arrows indicate signal direction:
−−−> indicates DTE to DCE•
<−−− indicates DCE to DTE•
60
Pin
1
Signal Description Direction 25 Pin Signal
J1−50 MODE_0 Shorting
group
− − −
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J1−51
J1−52
GND
MODE_DCE
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
−
1
Any pin not referenced is not connected.
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Serial Cable CAB−232FC
This section presents the cable assembly and pinouts for the CAB−232FC serial cable.
The cable gender for this product (part number 72−0794−01) is Male DB−60 to Female DB−25, mode −
DCE.
This cable is used in the following systems: the Cisco 7000 family, Cisco 4000 series, Cisco 3600 series,
Cisco 2500 series, Cisco 1600 series, Cisco access servers, and AccessPro PC cards. This cable has a male
DB−60 connector on the Cisco end and a female DB−25 connector on the network end.
EIA/TIA−232 DCE Cable Pinouts (DB−60 to DB−25)
The table below shows the EIA/TIA−232 DCE cable pinouts (DB−60 to DB−25).
Note: The arrows indicate signal direction:
−−−> indicates DTE to DCE•
<−−− indicates DCE to DTE•
60 Pin
Signal Description Direction 25 Pin Signal
J1−50
J1−51
MODE_0
GND
Shorting
group
− − −
J1−46 Shield
GND
Single − J2−1
Shield
GND
J1−36
Shield
RxD/TxD
−
Twisted pair
no. 9
<−−−
−
J2−2
Shield
TxD
−
J1−41
Shield
TxD/RxD
−
Twisted pair
no. 5
−−−>
−
J2−3
Shield
RxD
−
J1−35
Shield
CTS/RTS
−
Twisted pair
no. 10
<−−−
−
J2−4
Shield
RTS
−
J1−42
Shield
RTS/CTS
−
Twisted pair
no. 4
−−−>
−
J2−5
Shield
CTS
−
J1−43
Shield
DTR/DSR
−
Twisted pair
no. 3
−−−>
−
J2−6
Shield
DSR
−
J1−45
Shield
Circuit
GND
−
Twisted pair
no. 1
−
−
J2−7
Shield
Circuit
GND
J1−44 LL/DCD −−−> J2−8 DCD
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Shield − Twisted pair
no. 2
− Shield −
J1−39
Shield
TxCE/TxC
−
Twisted pair
no. 7
−−−>
−
J2−15
Shield
TxC
−
J1−40
Shield
NIL/RxC
−
Twisted pair
no. 6
−−−>
−
J2−17
Shield
RxC
−
J1−33
Shield
DCD/LL
−
Twisted pair
no. 12
<−−−
−
J2−18
Shield
LTST
−
J1−34
Shield
DSR/DTR
−
Twisted pair
no. 11
<−−−
−
J2−20
Shield
DTR
−
J1−38
Shield
RxC/TxCE
−
Twisted pair
no. 8
<−−−
−
J2−24
Shield
TxCE
−
Related Information
Technical Support − Cisco Systems•
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Updated: Jan 30, 2006 Document ID: 46800
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