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Asynchronous Connections

CAB-OCTAL-ASYNC Cable Pinouts

Cisco - CAB-OCTAL-ASYNC Cable Pinouts

Document ID: 14958

Updated: Sep 09, 2005

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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:

Interface Type DB25 Interface RJ-45 Interface
Console DCE DTE
AUX DTE DTE

Cable Pinout

2511_pinouts.gif

RJ45 Plug # Pin # Signal Name J1 Pin #
1 8 RTS 2
7 DTR 36
6 TXC 3
5 TXC GND 37
4 RXC GND 4
3 RXC 38
2 DSR 5
1 CTS 39
2 8 RTS 6
7 DTR 40
6 TXC 7
5 TXC GND 41
4 RXC GND 8
3 RXC 42
2 DSR 9
1 CTS 43
3 8 RTS 10
7 DTR 44
6 TXC 11
5 TXC GND 45
4 RXC GND 12
3 RXC 46
2 DSR 13
1 CTS 47
4 8 RTS 14
7 DTR 48
6 TXC 15
5 TXC GND 49
4 RXC GND 16
3 RXC 50
2 DSR 17
1 CTS 51
5 8 RTS 18
7 DTR 52
6 TXC 19
5 TXC GND 53
4 RXC GND 20
3 RXC 54
2 DSR 21
1 CTS 55
6 8 RTS 22
7 DTR 56
6 TXC 23
5 TXC GND 57
4 RXC GND 24
3 RXC 58
2 DSR 25
1 CTS 59
7 8 RTS 26
7 DTR 60
6 TXC 27
5 TXC GND 61
4 RXC GND 28
3 RXC 62
2 DSR 29
1 CTS 63
8 8 RTS 30
7 DTR 64
6 TXC 31
5 TXC GND 65
4 RXC GND 32
3 RXC 66
2 DSR 33
1 CTS 67

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.

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Related Information

Updated: Sep 09, 2005
Document ID: 14958