Specifications

Indicator Color Description
LALM
(Local
Alarm)
Yellow Lightswhenanalarmconditionis
detectedonincomingdata.
RALM
(Remote
Alarm)
Yellow LightswhentheassociatedE1
porthasdetectedlossofsignal
(LOS)oroutofframe(OOF)
errors.Thisoccurswhenthe
remoteLIU
1
receiveserrorsand
sendsasignaltoindicate
presenceofremoteerrors.
75(Ohm) Green E1trunkcardonly.ONindicates
75ohms,andOFFindicates
120ohms.
NLOOP
(Network
Loopback)
Yellow Lightswhentheportisconfigured
innetworkloopback.Thisisuseful
fortestingpurposes.
1
LIU=lineinterfaceunit(analogphysicalinterface).Referstocircuitrythat
interfacesaserialcommunicationscircuittoatransmissionmediumsuchas
coaxialcabling.
TrunkCardBantamJacks
Passiveportmonitoringissupportedthroughtwosharedbantamjacks
locatedatthebottomofthetrunkcardfrontpanel(see).Thebantam
jacksallowyoutoconnectanetworkmonitoringdevicetothetrunk
cardtodetectT1orE1errors.
The4characterLCDindicateswhichofthe12T1orE1linesaretobe
monitoredorinspectedusingthebantamjacks.
Toenablethebantamjacksforportmonitoring,followthesesteps:
Step1 Pushandquicklyreleasethepushbutton(labeledmonitor#)
belowtheLCDtotoggletotheportnumberyouwantto
display.
Youmustreleasethebuttonwithintwosecondstoadvance
throughtheportnumbers(from0to11).Afterport11,the
displayreturnstoport0.Asyouadvancethroughtheport
numbers,theportassociatedLEDsreflecttheconfiguration
statusandalarmconditionsoftheportnumberdisplayedin
theLCD.
Step2 Pushandholdthemonitorbuttonfortwoormoresecondsto
enablethebantamjack.Todisablethebantamjackand
returntotogglemode,pressthebuttonagainandholditfor
twoormoreseconds.
Whenyoureleasethebutton,theportnolongertoggles
throughtheportnumbers,theletter"B"isdisplayedinthe
LCD,andthebantamjacksareenabled.
Step3 RepeatStep1andStep2toenablethebantamjacksforeach
portyouwishtomonitor.
Figure6CT1andCE1TrunkCardFrontPanelLCDandBantam
Jacks