Contents
Introduction
This document guides you through the process of selecting the right serial cables for your network.
A serial cable is a cable used to transfer information between two devices using a serial communication protocol. The form of connectors depends on the particular serial port used. A cable wired for connecting two DTEs directly is known as a null modem cable. Your Cable Store 6 Foot DB9 9 Pin Serial Port Cable Male / Male RS232. 4.5 out of 5 stars 67. Get it as soon as Thu, Sep 19. FREE Shipping on orders over $25 shipped by Amazon. Only 1 left in stock - order soon. YCS Basics Black 10 Foot DB9 9 Pin Serial / RS232 Male / Female Extension Cable. NOTE: Do not mistake the computer's Parallel port for a serial port. Only very old computers have a 25-pin serial port. You cannot attach the wide end of the Laplink serial cable to a parallel port, nor can you attach a gender-changer adapter to force the cables to connect. Shop for serial port cable at Best Buy. Find low everyday prices and buy online for delivery or in-store pick-up. DTE normally refers to the serial port on a PC or terminal, while DCE refers to a modem or other type of communications device. Depending on the type of device on each end of the line, you either need a straight-through or a null-modem ('crossover') cable in order to communicate.
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 presented in this document was created from devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If you are working in a live network, ensure that you understand the potential impact of any command before using it.
Conventions
For more information on document conventions, see the Cisco Technical Tips Conventions.
Overview
One of the critical parts of setting up any router is the selection of the serial cables to connect the router to the serial devices in your network. There are so many different serial cables, with seemingly similar features, finding the correct cable can be tricky. This document guides you through the process of selecting the right 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?
- 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.
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:
DTE | DCE | Selectable DTE or DCE* | |
---|---|---|---|
Device | Terminals, Data Service 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. |
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.
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.
Ordering
To order serial cables and other Cisco products, contact your local account manager or Cisco customer service at 800-553-6387.
Cisco 7000 Series Cables
CX-FSIP4 | CX-FSIP8 | CX-HIP | CX-MIP-1CT1 | CX-MIP-2CT1 | |
---|---|---|---|---|---|
Number required | 1-4 | 1-8 | 1 | 1 | 1 |
EIA/TIA-232 DTE | CAB-232MT(=) | CAB-232MT(=) | -- | -- | -- |
EIA/TIA-232 DCE | CAB-232FC(=) | CAB-232FC(=) | -- | -- | -- |
EIA/TIA-449 DTE | CAB-449MT(=) | CAB-449MT(=) | -- | -- | -- |
EIA/TIA-449 DCE | CAB-449FC(=) | CAB-449FC(=) | -- | -- | -- |
V.35 DTE | CAB-V35MT(=)CAB-V35FT(=) | CAB-V35MT(=)CAB-V35FT(=) | -- | -- | -- |
V.35 DCE | CAB-V35FC(=)CAB-V35MC(=) | CAB-V35FC(=)CAB-V35MC(=) | -- | -- | -- |
X.21 DTE | CAB-X21MT(=) | CAB-X21MT(=) | -- | -- | -- |
X.21 DCE | CAB-X21FC(=) | CAB-X21FC(=) | -- | -- | -- |
HSSI | -- | -- | CAB-HSI1=, CAB-, HNUL=(M)* | -- | -- |
EIA/TIA-530 DTE | CAB-530MT= | CAB-530MT= | -- | -- | -- |
/Channelized | -- | -- | -- | CAB-7KCT1DB15 CAB-7KCT1NULL* | CAB-7KCT1DB15 CAB-7KCT1NULL* |
DTE is male and DCE is female, unless otherwise noted (M = male) (=) indicates spare product. * Allows connection of routers back-to-back. |
Com Port Cable
CAB-V35FC(=)CAB-V35MC(=)CAB-X21MT(=)CAB-X21FC(=)CAB-530MT=CAB-HSI1=CAB-HNUL=(M)CAB-7KCT1DB15CAB-7KCT1NULLCisco AGS+ Cables
AGS+ | |
---|---|
Number Required | Optional |
EIA/TIA-232 DTE | CAB-R23= |
EIA/TIA-232 DCE | CAB-R23= |
EIA/TIA-449 DTE | CAB-R44= |
EIA/TIA-449 DCE | CAB-R44= |
V.35 DTE | CAB-VTM(=), CAB-VTF(=) |
V.35 DCE | CAB-VCM(=), CAB-VCF(=) |
X.21 DTE | --- |
X.21 DCE | CAB-X21CF= |
HSSI | CAB-HSI1=, CAB-HNUL=(M)* |
EIA/TIA-530 DTE | --- |
DTE is male, and DCE is female, unless otherwise noted (M = male). (=) indicates spare product. * Allows connection of routers back-to-back. |
Cisco 4000 Series Cables
NP-2T | NP-4T | |
---|---|---|
Number Required | 1-2 | 1-4 |
EIA/TIA-232 DTE | CAB-NP232T(=) | CAB-232MT(=) |
EIA/TIA-232 DCE | CAB-NP232C(=) | CAB-232FC(=) |
EIA/TIA-449 DTE | CAB-NP449T(=) | CAB-449MT(=) |
EIA/TIA-449 DCE | CAB-NP449C(=) | CAB-449FC(=) |
V.35 DTE | CAB-NPV35TV2(=) | CAB-V35MT(=), CAB-V35FT(=) |
V.35 DCE | CAB-NPV35CV2(=) | CAB-V35FC(=), CAB-V35MC(=) |
X.21 DTE | CAB-NPX21T(=) | CAB-X21MT(=) |
X.21 DCE | CAB-NPX21C(=) | CAB-X21FC(=) |
EIA/TIA-530 DTE | CAB-3C530(=) | CAB-530MT(=) |
DTE is male and DCE is female, unless otherwise noted (M = male). (=) indicates spare product. |
NP-2T Cables
CAB-NP232T(=)CAB-NP232C(=)CAB-NP449T(=)CAB-NP449C(=)CAB-NPV35TV2(=)CAB-NPV35CV2(=)CAB-NPX21T(=)CAB-NPX21C(=)CAB-3C530(=)NP-4T Cables
CAB-232MT(=)CAB-232FC(=)CAB-449MT(=)CAB-449FC(=)CAB-V35MT(=)CAB-V35FT(=)CAB-V35FC(=)CAB-V35MC(=)CAB-X21MT(=)<CAB-X21FC(=)CAB-530MT(=)Cisco 3000 Series Cables
3102 | 3202 | 3104 | 3204 | |
---|---|---|---|---|
Number Required | 1 | 1-2 | 1-2 | 1-2 |
EIA/TIA-232 DTE | CAB-3C232(=) | CAB-3C232(=) | CAB-3C232(=) | CAB-3C232(=) |
EIA/TIA-232 DCE | -- | -- | CAB-3C232C(=) | CAB-3C232C(=) |
EIA/TIA-449 DTE | CAB-3C449(=) | CAB-3C449(=) | CAB-3C449(=) | CAB-3C449(=) |
EIA/TIA-449 DCE | -- | -- | CAB-3C449C(=) | CAB-3C449C(=) |
V.35 DTE | CAB-3CV35V2(=) | CAB-3CV35V2(=) | CAB-3CV35V2(=) | CAB-3CV35V2(=) |
V.35 DCE | -- | -- | CAB-3CV35V2C(=) | CAB-3CV35V2C(=) |
X.21 DTE | CAB-3CX21(=) | CAB-3CX21(=) | CAB-3CX21(=) | CAB-3CX21(=) |
X.21 DCE | -- | -- | CAB-3CX21C(=) | CAB-3CX21C(=) |
EIA/TIA-530 DTE | CAB-3C530(=) | CAB-3C530(=) | CAB-3C530(=) | CAB-3C530(=) |
DTE is male and DCE is female, unless otherwise noted (M = male). (=) indicates spare product. |
Cisco 2500 Series Cables
2500 | |
---|---|
Number Required | 1-2 |
EIA/TIA-232 DTE | CAB-232MT(=) |
EIA/TIA-232 DCE | CAB-232FC(=) |
EIA/TIA-449 DTE | CAB-449MT(=) |
EIA/TIA-449 DCE | CAB-449FC(=) |
V.35 DTE | CAB-V35MT(=), CAB-V35FT(=) |
V.35 DCE | CAB-V35FC(=), CAB-V35MC(=) |
X.21 DTE | CAB-X21MT(=) |
X.21 DCE | CAB-X21FC(=) |
EIA/TIA-530 DTE | CAB-530MT(=) |
DTE is male and DCE is female, unless otherwise noted (M = male). (=) indicates spare product. |
CAB-V35MT(=)CAB-V35FT(=)CAB-V35FC(=)CAB-V35MC(=)CAB-X21MT(=)CAB-X21FC(=)CAB-530MT(=)
Cisco 500-CS Series Cables
8-16 Port | |
---|---|
EIA/TIA-232 DCE | CAB-500DCM=, CAB-500DCF=, CAB-500RJ(=)* |
EIA/TIA-232 DTE | CAB-500DTM(=), CAB-500DTF=, CAB-500RJ(=)* |
Modem | CAB-5MODCM(=), CAB-500RJ(=)* |
DTE is male and DCE is female, unless otherwise noted (M = male). (=) indicates spare product. * For each port, a CAB-500RJ and corresponding connector must be ordered. |
Note: The 500-CS Series nomenclature differs from routing cables. DCE and DTE refer to the type of device connected to. For example, to connect a terminal (DTE) device, order a CAB-500DTM(=) or CAB-500DTF=.
CAB-500DCM=CAB-500DCF=CAB-500DTM(=)CAB-500DTF=CAB-500RJ(=)CAB-5MODCM(=)Related Information
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