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CT1andCE1TrunkCardOverview

ChannelizedingressinterfacesresideoneitherCT1orCE1trunk

cardsthatareinstalledintheCisco5814dialshelf.ACT1orCE1trunk

cardcontainsallnecessaryfunctionalitytoterminateincoming

telephonecalls.Thechannelizedtrunkcardisconfiguredinthefactory

foreitherT1orE1framing,dependingonyourorder.

showstheCT1andCE1trunkcardcomponents.

Figure3CT1andCE1TrunkCard

TheCT1andCE1trunkcardsperformthefollowingfunctions:

• Terminateupto12T1or12E1lines

TheCE1trunkcardprovidesphysicalterminationforupto12E1

linesandconnectstoanexternalnetworktermination(NT1)

device,whiletheCT1trunkcardprovidesphysicalterminationfor

upto12T1/PrimaryRateInterface(PRI)lines,includeschannel

serviceunits(CSUs),andconnectsdirectlytothetelconetwork.

• DemultiplexDS0s

Aframerremovesframingandembeddedsignalingbits(orinserts

themdependingonthedirectionoftheflow),andtheframerCPU

sendsthedatastreamtoonboardtimedivisionmultiplexing(TDM)

resources,whichbreakouteachcall(DS0)andpasseachcallto

anappropriatecallterminationresource.DigitalorISDN

originatedcallsareterminatedonboardtheCT1orCE1trunkcard

onHighlevelDataLinkControl(HDLC)controllers,andanalog

modemoriginatedcallsarepassedoverthedialshelfbackplane

TDMbustoanavailablemodemresource.Thesystemsoftware

controlsmodemandHDLCresourcemanagement.

• Respondtotimesensitivesignaling

EachindividualT1orE1portcanbeusedasthesystemclocking

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