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T1/E1 & T3/E3 Commands
XSR CLI Reference Guide 2-57
thereceivedsignals.Thisfeatureisprovidedbyplacingatransmitattenuatorinthedatapath.
Thisattenuationisselectablefrom0,‐7.5,‐15,or‐22.5dB.
Syntax
cablelength long{0db | -7.5db | -15db | -22.5db}
Syntax of the “no” Form
UsethenoformofthiscommandtoreturntheLBOvaluetothedefault:
no cablelength long
Defaults
0dB
Mode
Controllerconfiguration:XSR(config-controller<xx>)#
Example
ThefollowingexamplesetsthelonghaulLBOto–7.5dB:
XSR(config)#controller t1 1/0
XSR(config-controller<T1-1/0>)#cablelength long –7.5db
cablelength short
For T1 controllers only
ThiscommandspecifiesthepulseshapeofthetransmitsignalsasdefinedintheANSIT1.102
recommendationforshort‐haulapplications.
Theseapplicationsapplytohaullengthsshorterorequalto655‘(DSX‐1interface).Thisparameter
isusedtoobtainanoptimalpulseshapeforexternaltransformers.Fivehaullengthranges
are
defined,eachwithdifferentpulseshapingsettings:0...133ft(0..40m),133..266ft(40..81m),
266...399ft(81..122m),399..533ft(122..162m),and533 ..655ft(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
Numberofdecibelsbywhichthetransmitsignalislowered.
-7.5db
Numberofdecibelsbywhichthetransmitsignalislowered.
-15db
Numberofdecibelsbywhichthetransmitsignalislowered.
-22.5db
Numberofdecibelsbywhichthetransmitsignalislowered.