Command Reference Guide

SROS Command Line Interface Reference Guide T1 Interface Configuration Command Set
5991-2114 © Copyright 2005 Hewlett-Packard Development Company, L.P. 509
lbo long <value>
Use the lbo long command to set the line build out (in dB) for T1 interfaces with cable length greater 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
Valid options include: 0, -7.5, -15, and -22.5 dB
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 in
close proximity should be configured for the maximum attention (-22.5 dB).
Usage Examples
The following example configures the T1 interface LBO for -22.5 dB:
(config)#interface t1 1/1
(config-t1 1/1)#lbo long -22.5