Asynchronous Connections

Document ID: 14958

Contents

Introduction
Before You Begin
      Conventions
      Prerequisites
      Components Used
CAB-OCTAL-ASYNC Cable Pinouts
      Cable Pinout
Related Information

Introduction

This document provides detailed cabling information on CAB-OCTAL-ASYNC cables.

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.

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.

CAB-OCTAL-ASYNC Cable Pinouts

CAB-OCTAL-ASYNC cables use a 68-pin connector and breakout cable and provide eight RJ-45 rolled cable asynchronous ports on each 68-pin connector. You can connect each RJ-45 rolled cable asynchronous port to the console or Aux port of a device. The NM-16A or NM-32A high-density asynchronous network modules available for the 2600 and 3600 Series Routers can use this cable. For more information on cabling, refer to Serial Cable Guide and Cabling Guide for RJ-45 Console and AUX Ports.

Note: The asynchronous ports from the 68-pin connector are data terminal equipment (DTE) devices. DTE to DTE devices require a rolled (null modem) cable. DTE to data circuit-terminating equipment (DCE) devices require a straight-through cable. Since the CAB-OCTAL-ASYNC cable is itself rolled, you can connect each cable directly to the console ports of devices with RJ-45 interfaces. However, if the console port of the device to which you are connecting is a 25-pin interface (DCE), use the RJ-45 to 25-pin adapter (product number CAB-5MODCM=) marked "Modem" (to reverse the "roll") to complete the connection. Remember, if you need to increase the reach of the CAB-OCTAL-ASYNC cable, use a straight-through RJ-45 cable for the extension.

Port types for console and auxiliary ports on Cisco routers and switches are:

Cable Pinout

This cable has a male DB-68 (SCSI II) connector on the Cisco end, and eight RJ-45 connectors on the network end that can connect into eight DB-25 modular adapters if the end device has a 25-pin port.

Related Information

• Modem-Router Connection Guide
• Configuring a Terminal/Comm Server for Router Console Access
• Configuring a Comm/Terminal Server for Sun Console Access
• Establishing a Reverse Telnet Session to a Modem
• Configuring Terminal Lines and Modem Support
• Terminal Line and Modem Support Commands
• Cabling Guide for RJ-45 Console and AUX Ports
• Serial Cable Guide
• Technical Support - Cisco Systems