Enterasys Networks XSR CLI manual scramble

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