Specifications

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