Cisco RJ-45-to-AUX User Manual download pdf (Page 3)

Connecting Routers Back−to−Back Through the

AUX Ports

Introduction

Before You Begin

Conventions

Prerequisites

Components Used

Background Theory

Routers with DB−25 AUX Ports

Configure

Network Diagram

Configurations

Verify

Troubleshoot

Troubleshooting Procedure

Related Information

Introduction

This sample configuration shows you how to directly connect two routers without using a modem or other

data communication equipment (DCE) devices. For more information on how to configure modems on

auxiliary (AUX) or console ports, refer to Modem−Router Connection Guide or Access−Dial Technical Tips

Before You Begin

Conventions

For more information on document conventions, see the Cisco Technical Tips Conventions.

Prerequisites

There are no specific prerequisites for this document.

Components Used

This document is not restricted to specific software and hardware versions.

Background Theory

In this configuration, two Cisco routers are connected back−to−back through the asynchronous AUX ports

using a null modem cable (rollover cable). The AUX ports of the two routers are directly connected using a

rollover cable with Point−to−Point Protocol (PPP) running on the link. The AUX ports are data terminal

equipment (DTE) devices. Connecting DTE to DTE devices requires a null modem cable (rollover cable).

A flat−satin rollover (null modem) cable (part number CAB−500RJ= ) is usually provided with every Cisco

router to allow for RJ−45 console connectivity. If the AUX port is a DB−25, use a RJ−45−to−DB−25 adapter

marked "terminal" with the null modem cable (rollover cable).

Cisco − Connecting Routers Back−to−Back Through the AUX Ports

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Cisco RJ-45-to-AUX User Manual Page 3