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Command Reference

Release 11.1 CA

invert data

To invert the data stream, use the invert data interface configuration command. This command

applies only to the Cisco 7000 series routers with the RSP7000 and RSP7000CI, Cisco 7200 series

routers, and Cisco 7500 series routers. To disable this feature, use the no form of this command.

invert data

no invert data

Syntax Description

This command has no arguments or keywords.

Default

Data is not inverted.

Command Mode

Interface configuration

Usage Guidelines

This command first appeared in Cisco IOS Release 11.1 CA and Release 11.2 P.

If the interface on the PA-T3 and PA-2T3 synchronous serial port adapters is used to drive a

dedicated T3 line that does not have B8ZS encoding (a method to avoid 15 zeros), the data stream

must be inverted (both TXD and RXD) either in the connecting CSU/DSU or the interface.

By inverting the HDLC data stream, the HDLC zero insertion algorithm becomes a ones insertion

algorithm that satisfies the T3 requirements. Be careful not to invert data both on the interface and

on the CSU/DSU as two data inversions will cancel each other out.

Inverting is a method of avoiding excessive zeroes that is superseded by the use of B8ZS encryption.

This option could be needed for use with legacy equipment that supports this option.

Example

The following example inverts data on serial interface 3/1/0:

interface serial 3/1/0

invert data

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Cisco RSP7000 Bedienungsanleitung Seite 10