Support User Manuals

Telos Zephyr Xstream Two-Way Radio User Manual

Open as PDF

of 381

USER’S MANUAL

Appendix 10 – Glossary 350

DCE‐DataCommunicationEquipmentWhenusingserialcommunicationssuchRS‐232,V.35,

orX.21,theDCEisthedevicesending/receivingfromtheTelcoline.i.e.:amodemorCSU/DSU.

IncontrasttoDTE.

DDS‐DigitalDataSystem SeeDedicatedDigitalService.

DedicatedCircuitApermanentchannelbetweentwolocations.AsopposedtoaSwitched

Circuit.

Dedica

tedDigitalServiceA“Hardwired”or“NailedUp”digitalcircuitwhichispermanently

connectedbetween2points.Typically56Kbpsor64Kbps.Dedicateddigitallinesarefrequently

cheaperthanISDNforfulltimeservice.AlsocalledDigitalDataSystemorDDS.

DID‐DirectInwardDialingTheabilityforanoutsidecallertodialtoaPBXextensionwithout

goingthroug

hanattendantorauto‐attendant.SeealsoDIDNumberandDIDTrunk.

DIDExtensionorDIDstationAspecificphonewithinaPBXwhichcanbecalledfromthepublic

telephonenetworkwithoutgoingthroughanattendantorauto‐a

ttendant.

DIDNumberAphonenumberusedtoroutecallsfromthetelephonenetworktoaspecific

phoneinaPBX(theDIDextension).DIDrequiresspecialDIDtrunksorISDNPRI“two‐wayDID”

trunks.BlocksofDIDnumbers(typically10or20,sometimeshigher)arepurchasedfromtheLEC

orCLECforuseonthePBX.Th

enumberofDIDnumbersusuallysubstantiallyexceedsthe

numberoftrunksinthesystem.

DIDTrunk‐ADirectInwardDialingTrunk.Atrunk(channel)whichcanonlyreceivecalls.A

groupoftelephonenumbers(DIDnumbers)areassociatedwithagiventrun

kgroup,however

thereisnoone‐to‐onecorrespondencebetweentheindividualchannelsandthesenumbers.

ThePBXusestheDIDnumbergivenitbythephonecompanytoroutethechanneltothecorrect

DIDextensionwithinthePBX.ThisallowssomeorallPBXstationstoreceivecallsdirectly

withoutgoingthrou

ghanattendant(orautoattendant)NotethatthereareusuallymoreDID

numbersthanthereareDIDtrunks.SeeDIDnumberandDIDextension.

DirectInwardDialingSeeDID

DirectoryNumber(USA&Canada)Yoursevendigittelephonenumber(withouttheareacode),

asfoundinthetel

ephonedirectory.

Directory1&2(Zephyr)TheUtilitymenuontheZephyrwherethe7digitDirectoryNumbers

canbeenteredduringsetup.TheZephyrgenerallydoesnotrequirethesenumbers.

DNSeeDirectoryNumber.SeealsoDirectory1&2andMSN/DN1&2.

DNIS‐DialedNumberIdentificationServiceAservice,typi

callyofferedbyalongdistance

companyon800lines,thatprovidesthenumberdialedbythecaller.Thisallowsacallerto

receivespecifictreatmentdependingonthenumberdialed.

DPDialPulse.Amethodoffsendingaddressinformationbyeither1)Causingbrief

interruptionsinloopcurrent.or2)Caus

ingbriefchangesofstateofabitonadigitalcircuitusing

ChannelAssociatedSignaling.Inotherwords,"rotary"or"pulse"dialing.SeealsoDTMFand

CAS.

DSØ‐DigitalSignalLevelZeroThesmallestunitofmeasureofthestandardratehierarchyused

bytheTelcos(i.e.allotherratesareamultipleoftheDSØrate.Forexample,theT1rateis24

timestheDSØrateandtheE1rateis32tim

estheDSØrate).64kbps.SeealsoBchannel.

previous next