ADTRAN 1000R Series lbo [long <-22.5, -15, -7.5, 0>

Command Reference Guide T1 Interface Configuration Command Set

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 ar e -2 2. 5, -1 5 , -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 pr oximity

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