ADTRAN 1000R Series - Manual (Page 702)

Command Reference Guide T1 Interface Configuration Command Set
61200510L1-35E Copyright © 2005 ADTRAN 702
lbo [long <-22.5, -15, -7.5, 0> | short <0-655>]
Use the lbo command to configure the line build out (LBO) for the T1 interface. Use the no form of this
command to return to the default value.
Syntax Description
long <-22.5, -15, -7.5, 0> Configures the LBO (in dB) for T1 interfaces with cable lengths greater than
655 feet. Choices are -22.5, -15, -7.5, and 0 dB.
short <0-655> Configures the LBO (in feet) for T1 interfaces with cable lengths less than
655 feet. Range is 0 to 655 feet.
Default Values
By default, the build out is set to 0 dB.
Applicable Platforms
This command applies to the NetVanta 1000R, 3000, 4000, and 5000 and Total Access 900 Series units.
Command History
Release 1.1 Command was introduced.
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. For example, two units in close proximity
should be configured for the maximum attenuation (-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 -22.5