Command Reference Guide

SROS Command Line Interface Reference Guide T1 Interface Configuration Command Set

lbo short <value>

Use the lbo short command to set the line build out (in feet) for T1 interfaces with cable length less than

655 ft. Use the no form of this command to return to the default value

Syntax Description

<value> Configures the line build out for the T1 interface. Enter the estimated cable length

between the two units.

Valid options include: 0 to 655 feet

Default Values

<value> 0 dB

Command Modes

(config-t1 1/1)# T1 Interface Configuration Mode required

Functional Notes

Line build out (LBO) is artificial attenuation of a T1 output signal to simulate a degraded signal. This is

useful to avoid overdriving a receiver’s circuits. The shorter the distance between T1 equipment

(measured in cable length), the greater the attenuation value. Use the two line build out commands

(lbo long and lbo short) to customize the attenuation based on the cable length. For example, two units

three feet apart should be configured using the following: lbo short 3.

Usage Examples

The following example configures the T1 interface LBO for 50 feet:

(config)#interface t1 1/1

(config-t1 1/1)#lbo short 50