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Telos Zephyr Xstream Two-Way Radio User Manual

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USER’S MANUAL

Appendix 10 – Glossary 360

CustomPMP,andDMScustomISDNprotocolstheequipmentrequiresthattheusertoprogram

SPIDsintoit.CustomPTPandETS300protocolsdonotrequireaSPID.NoSPIDsarerequiredfor

ISDNPRIprotocols.

SS7‐SignalingSystem7TheinternationallyadoptedCommonChannelInteractiveSignaling

(CCIS)system.PrevioustoSS7theBellSyst

emusedSS6whichdidnotsupporttheInternational

Standards.SS7does.Itallowsforsubstantiallyflexibilityandpowerindynamicallyroutingscalls.

AnSS7databaselookupishowacalltoamobiletelephoneusercanhandledtransparently

despitethefactthattheuser'slocationmaychange.Alsousedtodeter

minewhatcarriershould

handleagiventollfreecall.SeealsoCCIS.

StationLineAtelephonecircuitfromaPBXtoatelephoneonthatPBX.Sincethisisa

telephone‐to‐switchconnectionitisconsideredtobea“line”.SeeLineandTrunk

St

ationSideTheusersideofaPBX.Thesideoftheswitchthatthetelephonesareattached.

Also,occasionallycalledthe'lineside'.Themainreasonfordistinguishingbetweenthisandthe

trunksideisthatcertaincustomerrelatedfeatures(SuchasHoldandTransfer)areinapplicable

totrunks.SeealsoTrun

kSide.

StatisticalMultiplexingAmethodofimprovingeffectivebandwidthofaTelcochannel.

StatisticalMultiplexingtakesadvantagethattherearetypicallymanypausesinaconversation.

Bytakingadvantageofthisfact,andnotsendingthepauses,improvementsinefficiencycanbe

made.Alsoreferredtoassilencesuppr

ession.SeeCircuitSwitched.

SubscriberThecustomerofaTelecommunicationscompany.Thistermdatesbacktowhena

localTelephoneCompanywasformedatthespecificrequestofagroupofcustomerswho

agreedinadvanceto“subscribe”totheservice.

SuperframeSeeSF

SwitchTelephoneswitchingdevicewhich“makestheconn

ection”whenyouplaceacall.

Modernswitchesarespecializedcomputers.ISDNserviceisprovidedfroma“Digital”switch,

mostcommonly(intheUSA&Canada)anAT&Tmodel“5ESS”,NorthernTelecommodel“DMS‐

100”,orSiemensmodel“EWSD”.Theswitch,andrelatedsoftwarerunningonit,willdetermine

whichISDNprotocol(

s)willbeavailabletocustomersconnectedtoit.SeealsoPBX.

SwitchType(ZephyrExpress)TheutilitymenuitemwheretheISDNProtocolisselected.See

TelcoSettingandNationalISDN.

SwitchedCircuitAchannelwhichisnotpermanentinnature,butisconnectedthrougha

switchingdeviceofsomeki

nd.Theswitchingdeviceallowsaswitchedcircuittoaccessmany

otherswitchedcircuits(theusual“dialup”typeoftelephonechannels).Oncetheconnectionis

madehowever,thecompletecapacityofthechannelisavailableforuse.Asopposedtoa

dedicatedcircuitorapacketbasedconnection.

Switched‐56Aty

peofdigitaltelephoneservicedevelopedinthemid1980’swhichallows

dialingonasingle56Kbpsline.EachSwitched‐56circuithas1or2copperwire‐pairsassociated

withit.Youwillneedtoknowinadvanceifyouwillhavethetwo‐wireorfour‐wireversionso

youcanprocuretheappropriateCSU/DSU.Switche

d‐56isbeingrapidlyreplacedwithISDN,

whichischeaperandmoreflexible.SeealsoCSU/DSU.

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