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Enterasys Networks XSR CLI Router User Manual

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T1/E1 & T3/E3 Commands

2-70 Configuring T1/E1 and T3/E3 Subsystems

Syntax

linecode {ami | b8zs | hdb3}

Syntax of the “no” Form

Returntothedefaultlinecode settingbyusingthenoform:

no linecode

Defaults

•T1line:B8ZS

•E1line:HDB3

Mode

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

Example

ThisexamplesetstheT1controllerwithESFframing,andB8ZSlineencoding:

XSR(config)#controller t1 1/0

XSR(config-controller<T1-1/0>)#framing esf

XSR(config-controller<T1-1/0>)#linecode b8zs

loopback

For T1/E1 controllers only

ThiscommandimplementsloopbacktestsonaT1/E1/ISDN‐PRIsubsystem.Typically,itisused

fordiagnosticpurposesalthoughyoucanconfigureanIPaddressasaloopbackinterfa c eas

shownintheexample.IfyouconfigurealoopbackaddressfortheXSR,itwillbeusedasthe

RouterID.If

thereisnoloopbackaddressdefined,theRouterIDisthehighestnon‐zeroIP

addressofexistingconfiguredandactiveinterfaces.

WhenaT1/E1/ISDN‐PRIlinemalfunctions,onetroubleshootingoptionistoperformvarious

loopbacktests,forinstance,isolatingpiecesofthelinktotest separately.Loopbacktestingshould

begin

onthelocalrouterandproceedtotestingtheservice/networkprovider.Beawarethatall

loopbacktestingisintrusive,andwhileloopbacktestsrun,datatransfersoverthelinkarebarred.

Syntax

loopback {diagnostic | local {line | payload}}

ami

AlternateMarkInversion(AMI)lineencoding.

b8zs

Bipolar8ZeroSubstitution(B8ZS)lineencoding.UsedforT1controllersonly.

hdb3

High‐DensityBipolar3(HDB3)lineencoding.UsedforE1controllersonly.

diagnostic

Loopstheoutgoingtransmitsignalbacktothereceivesignal.Usetheshow

t1/e1 controller

commandtocheckifloopbackisset.Useshow

interface serial

toverifythatthechannelgroupsareloopedback.

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