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Cisco 1000 Series Routers

Auxiliary Port, Console Port, And Adapter Pinouts For Cisco 1000, 1600, 2500, 2600, And 3600 Series Routers

Cisco - Auxiliary Port, Console Port, and Adapter Pinouts for Cisco 1000, 1600, 2500, 2600, and 3600 Series Routers

Document ID: 46789

Updated: Jan 27, 2006

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Introduction

This document explains the different ports and adapter pintouts for Cisco 1000, 1600, 2500, 2600, and 3600 Series Routers.

Prerequisites

Requirements

There are no specific requirements for this document.

Components Used

The information in this document is based on these software and hardware versions:

  • Cisco 1000, 1600, 2500, 2600, and 3600 Series Routers

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

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

Auxiliary and Console Ports

The console and auxiliary ports on Cisco IOS® routers are asynchronous serial ports. The console port and the auxiliary port are configured as data terminal equipment (DTE). For Cisco 1000, 1600, 2500, 2600, and 3600 Series Routers, the console and auxiliary ports both use RJ-45 connectors. Adapters are available for connections to PC terminals, modems, or other external communications equipment.

This table shows the console port pinouts for the RJ-45 connector:

Console Port (DTE)
Pin1 Signal Input/Output
1 - -
2 DTR Output
3 TxD Output
4 GND -
5 GND -
6 RxD Input
7 DSR Input
8 - -

1Any pin not referenced is not connected.

This table shows the auxiliary port pinouts of the RJ-45 connector:

Auxiliary Port (DTE)
Pin2 Signal Input/Output
1 RTS Output
2 DTR Output
3 TXD Output
4 GND -
5 GND -
6 RXD Input
7 DSR Input
8 CTS Input

2Any pin not referenced is not connected.

Identify a Rollover Cable

In order to identify a rollover cable, compare the two modular ends of the cable. Hold the cables in your hand, side-by-side, with the tab at the back. The wire connected to the pin on the outside of the left connector (pin 1) must be the same color as the pin on the outside of the right connector (pin 8). On Cisco cables, pin 1 is white on one connector, and pin 8 is white on the other connector.

rollovercable.gif

This table shows the RJ-45 rolled (console) cable pinouts:

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

Console Port Connection to a PC

To connect a PC terminal to the console port, use the RJ-45-to-RJ-45 rollover cable, and either the RJ-45-to-DB-25 female DTE adapter or the RJ-45-to-DB-9 female DTE adapter (labeled "TERMINAL").

The default parameters for the console port are:

  • 9600 baud

  • 8 data bits

  • No parity generated or checked

  • 1 stop bit

  • No Flow Control

Console Port Signaling and Cabling with a DB-9 Adapter

con_pcdb9.gif

ios_co1.gif

The next table shows the pinout descriptions for the DB-9 connections:

Console Port (DTE) RJ-45-to-RJ-45 Rollover Cable RJ-45-to-DB-9 Terminal Adapter Console Device
Signal RJ-45 Pin RJ-45 Pin DB-9 Pin Signal
RTS 13 8 8 CTS
DTR 2 7 6 DSR
TxD 3 6 2 RxD
GND 4 5 5 GND
GND 5 4 5 GND
RxD 6 3 3 TxD
DSR 7 2 4 DTR
CTS 8 1 7 RTS

3Pin 1 is connected internally to Pin 8.

Console Port Signaling and Cabling with a DB-25 Adapter

ios_co2.gif

con_termdb25.gif

The next table shows the pinout descriptions for the DB-25 connections:

Console Port (DTE)4 RJ-45-to-RJ-45 Rollover Cable RJ-45-to-DB-25 Terminal Adapter Console Device
Signal RJ-45 Pin RJ-45 Pin DB-25 Pin Signal
RTS 15 8 5 CTS
DTR 2 7 6 DSR
TxD 3 6 3 RxD
GND 4 5 7 GND
GND 5 4 7 GND
RxD 6 3 2 TxD
DSR 7 2 20 DTR
CTS 8 1 4 RTS

4You can use the same cabling to connect a console to the auxiliary port.

5Pin 1 is connected internally to Pin 8.

Auxiliary Port Connection to a Modem

In order to connect a PC terminal to the router, use the RJ-45-to-RJ-45 roll-over cable and either the RJ-45-to-DB-25 female DTE adapter or the RJ-45-to-DB-9 female DTE adapter (labeled "TERMINAL"). This section lists the pinout descriptions for both DB-9 and DB-25 connections.

In order to connect a modem to the auxiliary port, use the RJ-45-to-RJ-45 rollover cable and the RJ-45-to-DB-25 male DCE adapter (labeled "MODEM").

Auxiliary Port Signaling and Cabling Using a DB-25 Adapter

ios_co3.gif

aux_moddb25.gif

Here is the pinout description for the modem connection:

Auxiliary Port (DTE) RJ-45-to-RJ-45 Rollover Cable RJ-45-to-DB-25 Modem Adapter Modem
Signal RJ-45 Pin RJ-45 Pin DB-25 Pin Signal
RTS 16 8 4 RTS
DTR 2 7 20 DTR
TxD 3 6 3 TxD
GND 4 5 7 GND
GND 5 4 7 GND
RxD 6 3 2 RxD
DSR 7 2 8 DCD
CTS 8 1 5 CTS

6Pin 1 is connected internally to Pin 8.

Alternative Terminal and Modem Connections

Cisco Port Connection RJ-45 Cable Type Adapter
Console port to PC Straight-through DCE, DB-9 female
Console port to terminal Straight-through DCE, DB-25 female
Auxiliary port to modem Rollover7 DCE8, DB-25, male
- Straight-through DTE8, DB-25, male

7An octal cable or RJ-45 breakout cable is equivalent to a rollover cable.

8Modify the DB-25 adapter by removing pin 6 and placing it into the pin 8 position.

Related Information

Updated: Jan 27, 2006
Document ID: 46789