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Cisco 7000 Series Routers

5-in-1 X.21 Assembly and Pinouts

Document ID: 12225

Updated: Mar 04, 2008

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Introduction

This document describes the X.21 cable assembly and pinouts (Data Terminal Equipment - DTE and Data Communications - DCE).

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, make sure that you understand the potential impact of any command.

Conventions

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

X.21 Cable Assembly

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X.21 DTE Cable Pinouts (DB-60 to DB-15)

The arrows in this table indicate signal direction:

  • --> indicates DTE to DCE

  • <-- indicates DCE to DTE

  • -- means direction not applicable

60 Pin*1* Signal Description Direction 15 Pin Signal
J1-48 J1-47 GND MODE_2 Shorting Group -- -- --
J1-51 J1-52 GND MODE_DCE Shorting Group -- -- --
J1-46 Shield_GND -- Single -- J2-1 Shield GND
J1-11 J1-12 TxD/RxD+ TxD/RxD-- Twisted pair no. 3 --> --> J2-2 J2-9 Transmit+ Transmit--
J1-9 J1-10 RTS/CTS+ RTS/CTS-- Twisted pair no. 2 --> --> J2-3 J2-10 Control+ Control--
J1-28 J1-27 RxD/TxD+ RxD/TxD-- Twisted pair no. 6 <-- <-- J2-4 J2-11 Receive+ Receive--
J1-1 J1-2 CTS/RTS+ CTS/RTS-- Twisted pair no. 1 <-- <-- J2-5 J2-12 Indication+ Indication--
J1-26 J1-25 RxC/TxCE+ RxC/TxCE-- Twisted pair no. 5 <-- <-- J2-6 J2-13 Timing+ Timing--
J1-15 Shield Control_GND -- Twisted pair no. 4 -- -- J2-8 Shield Control GND --
*1* Any pin not referenced is not connected.

X.21 DCE Cable Pinouts (DB-60 to DB-15)

60 Pin*1* Signal Description Direction 15 Pin Signal
J1-48 J1-47 GND MODE_2 Shorting Group -- -- --
J1-46 Shield_GND Single -- -- --
J1-46 Shield_GND -- Single -- J2-1 Shield GND
J1-28 J1-27 RxD/TxD+ RxD/TxD-- Twisted pair no. 6 <-- <-- J2-2 J2-9 Transmit+ Transmit--
J1-1 J1-2 CTS/RTS+ CTS/RTS-- Twisted pair no. 1 <-- <-- J2-3 J2-10 Control+ Control--
J1-11 J1-12 TxD/RxD+ TxD/RxD-- Twisted pair no. 3 --> --> J2-4 J2-11 Receive+ Receive--
J1-9 J1-10 RTS/CTS+ RTS/CTS-- Twisted pair no. 2 --> --> J2-5 J2-12 Indication+ Indication--
J1-24 J1-23 TxC/RxC+ TxC/RxC-- Twisted pair no. 4 --> --> J2-6 J2-13 Timing+ Timing--
J1-15 Shield Control_GND -- Twisted pair no. 5 -- -- J2-8 Shield Control GND --
*1* Any pin not referenced is not connected.

Related Information

Updated: Mar 04, 2008
Document ID: 12225