Enterasys Networks XSR CLI manual loopback

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interface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.