Support User Manuals

Enterasys Networks XSR CLI Router User Manual

Open as PDF

of 684

T1/E1 & T3/E3 Commands

2-72 Configuring T1/E1 and T3/E3 Subsystems

Mode

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

Default

1

Example

ThefollowingexampleconfigurestheE3controllerinslot1,card2withlinesourceclockinganda

nationalreservedbitof0:

XSR(config)#controller e3 1/2/0

XSR(config-controller<E3-1/2/0>)#clock source line

XSR(config-controller<E3-1/2/0>)#national bit 0

scramble

For T3/E3 controllers only

ThiscommandassistsclockrecoveryonthereceivingendofaT3/E3portbyrandomizingthe

patternof1sand0scarriedinthephysicallayerframe.Randomizingthebitscanprevent

continuous,non‐variablebitpatterns,inotherwords,longstringsofall1sor0s.

Severalphysicallayerprotocols

relyontransitionsbetween1sand0stomaintainclocking.

Scramblingcanpreventsomebitpatternsfrombeingmistakenlyinterpretedasalarms.The

followingconditionsmustbemet:

• Scramblingisusedonlyforfull‐rate/sub‐rateT3/E3portsandtheymustbeconfiguredas

unchannelizedforscramblingtotakeaffect.

•Remote

andlocalT3/E3scramblingconfigurationmustmatch.

•ForT3controllers,allDSUmodessupportscramblingexceptClearmode.

•ForE3controllers,onlyKentroxmodesupportsscrambling.

•ThisvalueisconfigurableonlyonanunchannelizedT3/E3port.

Syntax

scramble

Syntax of the “no” Form

Thenoformofthiscommanddisablesscrambling:

no scramble

Mode

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

Default

Disabled

previous next