Enterasys Networks XSR CLI cablelength short

T1/E1 & T3/E3 Commands

XSR CLI Reference Guide 2-57

thereceivedsignals.Thisfeatureisprovidedbyplacingatransmitattenuatorinthedatapath.

Thisattenuationisselectablefrom0,‐7.5,‐15,or‐22.5dB.

Syntax

cablelength long{0db | -7.5db | -15db | -22.5db}

Syntax of the “no” Form

UsethenoformofthiscommandtoreturntheLBOvaluetothedefault:

no cablelength long

Defaults

0dB

Mode

Controllerconfiguration:XSR(config-controller<xx>)#

Example

ThefollowingexamplesetsthelonghaulLBOto–7.5dB:

XSR(config)#controller t1 1/0

XSR(config-controller<T1-1/0>)#cablelength long –7.5db

cablelength short

ThiscommandspecifiesthepulseshapeofthetransmitsignalsasdefinedintheANSIT1.102

recommendationforshort‐haulapplications.

Theseapplicationsapplytohaullengthsshorterorequalto655‘(DSX‐1interface).Thisparameter

isusedtoobtainanoptimalpulseshapeforexternaltransformers.Fivehaullengthrangesare

defined,eachwithdifferentpulseshapingsettings:0...133ft(0..40m),133..266ft(40..81m),

266...399ft(81..122m),399..533ft(122..162m),and533..655ft(162..200m).

Note: Long haul line build-out (LBO) compensates for the loss in decibels based on the distance

from the device to the first repeater in the circuit. A longer distance from the device to the repeater

requires that the signal strength on the circuit be boosted to compensate for loss over that distance.

The ideal signal strength should be between -15 dB and -22 dB, which is calculated by adding the

Telecom/PTT company loss + cable length loss + line build out. The lengthening or building out of a

line is used to control far-end crosstalk. Line build-out attenuates the stronger signal from the

customer installation transmitter so that the transmitting and receiving signals have similar

amplitudes.

0db Numberofdecibelsbywhichthetransmitsignalislowered.

-7.5db Numberofdecibelsbywhichthetransmitsignalislowered.

-15db Numberofdecibelsbywhichthetransmitsignalislowered.

-22.5db Numberofdecibelsbywhichthetransmitsignalislowered.