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Configure Cable Requirements for Console and AUX Ports

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Contents

Introduction

This document describes the cable and connector requirements for console and auxiliary (AUX) ports.

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, ensure that you understand the potential impact of any command.

Conventions

Refer to Cisco Technical Tips Conventions for more information on document conventions.

Background Information

Cisco routers either have RJ-45-based or DB-25 DCE/DTE console and AUX ports. You can connect either a terminal (DTE) or a modem (DCE) to these ports. In either instance, you need both an RJ-45 cable and an RJ-45-to-DB-25 or RJ-45-to-DB-9 connector.

Table of Routers with Console and AUX Ports

The table in this section lists some of the Cisco router series and the corresponding console and AUX ports.

Router Console Port Console Port Cable AUX Port AUX Port Cable
600 RJ-45 (management port) RJ-45 Rolled / RJ-45 to DB-9 Female N/A N/A
700 RJ-45 RJ-45 Rolled N/A N/A
800 RJ-45 RJ-45 Rolled / RJ-45 to DB-9 Female N/A N/A
1000 RJ-45 RJ-45 Rolled N/A N/A
1600 RJ-45 RJ-45 Rolled / RJ-45 to DB-9 Female N/A N/A
1700 RJ-45 RJ-45 Rolled / RJ-45 to DB-9 Female RJ-45 RJ-45 Rolled
2500 RJ-45 RJ-45 Rolled RJ-45 RJ-45 Rolled
2600 RJ-45 RJ-45 Rolled RJ-45 RJ-45 Rolled
3600 RJ-45 RJ-45 Rolled RJ-45 RJ-45 Rolled
MC3810 RJ-45 RJ-45 Rolled RJ-45 RJ-45 Rolled
4000 DB-25 DCE RS 232 / RJ-45 Rolled DB-25 DTE RS 232 / RJ-45 Rolled
AS5200/5300 RJ45 RJ-45 Rolled RJ-45 RJ-45 Rolled
AS5400 RJ-45 RJ-45 Rolled RJ-45 RJ-45 Rolled
AS5800 DB-25 DCE RS 232 / RJ-45 Rolled DB-25 DTE RS 232 / RJ-45 Rolled
7100/7200/7300 RJ-45 RJ-45 Rolled RJ-45 RJ-45 Rolled
7200 DB-25 DCE RS 232 / RJ-45 Rolled DB-25 DTE RS 232 / RJ-45 Rolled
7500 DB-25 DCE RS 232 / RJ-45 Rolled DB-25 DTE RS 232 / RJ-45 Rolled
12000 DB-25 DCE RS 232 / RJ-45 Rolled DB-25 DTE RS 232 / RJ-45 Rolled

Console Port Settings for Terminal Connection

Before you connect a terminal to the console port, configure the terminal to match the router console port as shown here:

  • 2 stop bits (9600 8N2) OR 1 stop bit
    • Dependent on the router.
  • Types of Console and AUX Connectors

    Cisco routers have three types of console and AUX connectors. The table in this section lists these types:

    There are three styles of RJ-45-to-DB-25 connectors:

    DCE style (modem)

    DCE style (non-modem)

    Each of these styles has a different role. Generally, DTE is for terminals, DCE (modem) is for modems, and DCE (non-modem) is obsolete.

    Note: Move pin 6 to pin 8 if you want to change a DCE style (non-modem) to a DCE style (modem).

    Console and AUX Connectors for Cisco Routers

    Connector Graphic
    RJ-45 RJ-45
    DB-25 DCE DB-25 DCE
    DB-25 DTE DB-25 DTE

    Cable for console and AUX port:

    RJ-45 Cables

    Cisco products use these types of RJ-45 cables:

    Cisco does not provide these cables. These cables are widely available from other sources. Console cable is usually provided with the Console Cable Kit.

    Note: The console port does not support modem control or hardware flow control.

    RJ-45 Connector

    How to Identify an RJ-45 Cable

    In order to identify the RJ-45 cable type, hold the two ends of the cable next to one another so you can see the colored wires inside the ends, as shown here:

    RJ-45 Cable Ends

    There are three types of commonly used RJ-45 cables: straight, cross and rolled. Hold the two ends of an RJ-45 cable side by side. There are eight colored strips, or pins, at each end. If the order of the colored pins is the same at each end, the cable is straight. If the order of the colors is reversed at each end, the cable is rolled.

    Examine the sequence of colored wires to determine the type of RJ-45 cable. This section explains how you can do this.

    Straight-through Cable

    In a straight-through cable, the colored wires are in the same sequence at both ends of the cable.

    Straight-through Cable

    RJ-45 Straight-through (Ethernet) Cable Pin-outs

    Signal RJ-45 Pin RJ-45 Pin Signal
    Tx+ 1 1 Tx+
    Tx– 2 2 Tx–
    Rx+ 3 3 Rx+
    4 4
    5 5
    Rx– 6 6 Rx–
    7 7
    8 8

    Crossover Cable

    In a crossover cable, the first (far left) colored wire at one end of the cable is the third colored wire at the other end of the cable.

    Crossover Cable

    RJ-45 Crossover (Ethernet) Cable Pin-outs

    Signal RJ-45 Pin RJ-45 Pin Signal
    Tx+ 1 3 Rx+
    Tx– 2 6 Rx–
    Rx+ 3 1 Tx+
    4 4
    5 5
    Rx– 6 2 Tx–
    7 7
    8 8

    Rolled Cable

    In a rolled cable, the colored wires at one end of the cable are in the reverse sequence of the colored wires at the other end of the cable.

    Rolled Cable

    Rolled Cable Pinouts

    Signal RJ-45 Pin RJ-45 Pin Signal
    1 8
    2 7
    3 6
    4 5
    5 4
    6 3
    7 2
    8 1

    Note:CAB-OCTAL-ASYNC, the 8-port RJ-45 adapter that is used with the Cisco 2509, 2510, 2511, and 2512, is the same as a rolled cable.

    RJ-45 to DB-9 Female*

    RJ-45 to DB-9 Female*

    This cable is also known as Management Cable.

    • Cisco provides this cable with the 600, 800, 1600 and 1700 Series Routers.

    Type of Cable for DB-25 Connectors

    RS 232 Straight-through Cable

    This illustration shows serial cable CAB-R23= (part number 74-0173), which is a general serial cable for all router platforms:

    Both Ends of RS 232 Straight-through Cable for DB-25 Connectors

    Both Ends of RS 232 Straight-through Cable for DB-25 Connectors

    This cable has a female DB-25 connector on one end and a male DB-25 connector on the other end. Either end of the CAB-R23 cable can be the Cisco end or the network end, based on whether the Cisco router is designated as a DCE device or a DTE device. If the router is designated as a DCE device, the female DB-25 connector is the Cisco end. If the router is designated as a DTE device, the male DB-25 connector is the Cisco end.

    Pin-outs for RS 232 Straight Through Cable (DB-25)

    Male DTE Pin-outs Female DTE Pin-outs
    25 Pin Signal 25 Pin Signal
    J2-1 Shield GND J2-1 Shield GND
    J2-2 Shield TxD – J2-2 Shield TxD –
    J2-3 Shield RxD – J2-3 Shield RxD –
    J2-4 Shield RTS – J2-4 Shield RTS –
    J2-5 Shield CTS – J2-5 Shield CTS –
    J2-6 Shield DSR – J2-6 Shield DSR –
    J2-7 Shield Circuit GND – J2-7 Shield Circuit GND
    J2-8 Shield DCD – J2-8 Shield DCD –
    J2-15 Shield TxC – J2-15 Shield TxC –
    J2-17 Shield RxC – J2-17 Shield RxC –
    J2-18 Shield LTST – J2-18 Shield LTST –
    J2-20 Shield DTR – J2-20 Shield DTR –
    J2-24 Shield TxCE – J2-24 Shield TxCE –

    Adapters

    You need two types of adapters to connect a PC to a router.

    RJ-45-to-DB-9 Adapter

    This adapter connects a router to a PC though a COM port.

    RJ-45-to-DB-9 Adapter

    RJ-45-to-DB-25 Adapter

    This adapter connects a router to PC through a serial port.

    RJ-45-to-DB-25 Adapter-Female Adapter

    Cable and Adapter Setups that Work

    Here are the most common ways to console into a router.

    Console Connection Combination

    Console Port Cable Adapter for PC Adapter for Console Port
    RJ-45 RJ-45 Rolled DB-9 / DB-25 None
    DB9-RJRT Adapter-Rolled Over RJ-45 Cable
    DB-25 DCE RJ-45 Rolled DB-9 / DB-25 RJ-45-to-DB-25
    DB-25 DCE DB-25 None None
    DB-25 DCE, DB-25, None, None
    RJ-45 RJ-45-to-DB-9 None None
    • Cisco provides this cable with the Cisco 600, 800, 1600 and 1700 Series Routers.

    You cannot mix and match these components randomly. Here are the combinations that work:

    Console Connection Combination

    Port RJ-45 Cable DB-25 Adapter To Attach
    AUX / Console Straight DCE non-modem TERMINAL
    AUX / Console Rolled DTE TERMINAL
    AUX / Console Rolled DCE modem MODEM
    AUX / Console RJ-45-to-DB9 None TERMINAL

    These are the only setups that work. If you do not have the components you need, use the RJ-45 Component Guide chart to order them.

    RJ-45 Port and Adapter Pin-outs

    This chart shows the pin-outs for RJ-45 console and AUX ports. The console port does not use RTS/CTS.

    RJ-45 Port Pin-outs

    Signal Console Port (DTE) RJ-45 Rolled Cable Adapter Adapter Signal
    RJ-45 RJ-45 Pin DB-9 Pin DB-25 Pin
    CTS 1 8 7 4 RTS
    DTR 2 7 4 20 DSR
    TxD 3 6 3 2 RxD
    GND 4 5 5 7 GND
    GND 5 4 5 7 GND
    RxD 6 3 2 3 TxD
    DSR 7 2 6 8 DTR
    RTS 8 1 8 5 CTS

    DB-25 Console and AUX Port Pin-outs

    Console Port Signals

    Pin Signal Direction Description
    1 GND Ground
    2 TxD Receive Data
    6 DSR —> Data Set Ready (always on)
    7 GND Ground
    8 DCD —> Data Carrier Detect (always on)

    Note: The console port does not support modem control or hardware flow control.

    Auxiliary Port Signals

    Pin Signal Direction Description
    2 TxD —> Transmit Data
    3 RxD Request To Send (used for hardware control)
    5 CTS

    Note: The auxiliary port supports hardware flow control and modem control.

    Console Cable Kit

    A console cable kit is provided with your router. Use this kit when you connect your router to a PC or a terminal.

    The console cable kit contains these items:

    RJ-45-to-RJ-45 console cable (blue)

    RJ-45-to-DB-25 adapter (gray)

    RJ-45-to-DB-9 adapter (gray)

    Note: The Cisco 7200 Series and Cisco 7301 are not shipped by default with a console cable kit. If a console cable is required, order an accessory kit (part number: ACS-2500ASYN).

    RJ-45-to-RJ-45 console cable RJ-45-to-DB-25 adapter RJ-45-to-DB-9 adapter
    RJ-45-to-RJ-45 Console Cable RJ-45-to-DB-25 Adapter DB-9-to-RJ-45 Console Adapter

    Cisco RJ-45 Component Guide

    This chart summarizes the RJ-45 components of Cisco:

    RJ-45 Component Guide

    Style Catalog Part Number Catalog Description Label Shielded?
    DTE CAB-500DTF= DB-25 CONNECTOR, DTE FEMALE 29-0810-01/29-DTF-01 no
    DTE CAB-500DTM= DB-25 CONNECTOR, DTE MALE no
    modem CAB-25AS-MMOD= CABLE CONN-MODEM TO RJ45 SHLD yes
    modem CAB-MMOD= ADP,RJ45/DSUB 29-0881-01/29-MMOD-01 no
    DCE CAB-500DCF= DB-25 CONNECTOR, (non-modem) DCE FEMALE 29-0809-01/29-DCF-01 no
    DCE CAB-500DCM= DB-25 CONNECTOR,(non-modem) DCE MALE 29-0808-01/29-DCM-0129- 0808-01/29-DCM-01 no
    NA Rolled Cable CABASY,RJ45 ROLLED, MODULAR 72-0876-01/CAB-500RJ NA
    NA Straight Cable –not in catalog– 31-0756-01 NA
    Cable for DB-25/DB-9 Connection
    NA Depends on the router* RJ-45 to DB-9 female an all in one cable 72-3383-01 NA
    NA CAB-R23= RS 232 Straight-through Cable NA
    NA Depends on the router* DB-9 Male to DB-25 male for Modem connection 29-4043-01 NA

    The first seven entries are DB-25 connectors, and the last two are RJ-45 cables. Connectors are described in terms of their sex and their role. For example, an FDTE is a female DTE style connector, an MMOD is a male modem style connector, and so on. Again, you need shielded cables in order to run at 115.2 kbps.

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