Cisco CAB-V35MT= User Manual
finding the correct cable can be tricky. This document guides you through the process of selecting the right
serial cables for your network.
serial cables for your network.
The selection of the proper serial cable involves answering three questions:
Is the router being connected to a data terminal equipment (DTE) or data communications equipment
(DCE) device?
(DCE) device?
•
Is a male or female connector required on the cable?
•
What signaling standard does the device require?
•
With the answers to these questions, along with the model of your router, you can find the part number of the
cable required from the tables that follow.
cable required from the tables that follow.
DTE or DCE?
Devices that communicate over a serial interface are divided into two classes: DTE and DCE. The most
important difference between these types of devices is that the DCE device supplies the clock signal that
paces the communications on the bus. The documentation provided with the device should indicate whether it
is DTE or DCE (some devices have a jumper to select either mode). If you cannot find the information in the
documentation, use the following general guidelines to help you select the proper class:
important difference between these types of devices is that the DCE device supplies the clock signal that
paces the communications on the bus. The documentation provided with the device should indicate whether it
is DTE or DCE (some devices have a jumper to select either mode). If you cannot find the information in the
documentation, use the following general guidelines to help you select the proper class:
DTE
DCE
Selectable
DTE or DCE*
Device
Terminals, Data Service
Unit/Channel Service Unit
(DSU/CSU), Multiplexors
Unit/Channel Service Unit
(DSU/CSU), Multiplexors
Modems Hubs, Routers
Gender
Male
Female
Either
* Selectable devices usually have a jumper, switch, or software
command used to select DTE or DCE.
command used to select DTE or DCE.
Male or Female
The gender of the connector is determined by examining the connector. If pins protrude from the base of the
connector, the connector is male. If the connector has holes to accept the pins, the connector is female. Refer
to the drawings to identify the connector that you need.
connector, the connector is male. If the connector has holes to accept the pins, the connector is female. Refer
to the drawings to identify the connector that you need.
Signaling
A number of different standards defines the signaling over a serial cable (including EIA/TIA−232, X.21,
V.35, EIA/TIA−449, EIA−530, and HSSI). Each standard defines the signals on the cable, and specifies the
connector at the end of the cable. The documentation for the device being connected should indicate the
signaling standard used for that device. If you cannot find the information in the documentation, use the
illustrations below to select the signaling standard required. Select the connector that will mate with the
connector on your device, rather than the illustration that looks like the connector on the device.
V.35, EIA/TIA−449, EIA−530, and HSSI). Each standard defines the signals on the cable, and specifies the
connector at the end of the cable. The documentation for the device being connected should indicate the
signaling standard used for that device. If you cannot find the information in the documentation, use the
illustrations below to select the signaling standard required. Select the connector that will mate with the
connector on your device, rather than the illustration that looks like the connector on the device.
Ordering
To order serial cables and other Cisco products, contact your local account manager or Cisco customer service
at 800−553−6387.
at 800−553−6387.