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Telos Zephyr Xstream Two-Way Radio User Manual

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USER’S MANUAL

Appendix 10 – Glossary 345

Appendix 10: Glossary

You’llgetbetterresultsfromtheTelcoifyouunderstand,andspeak,thelingo!Wehavetried

toincludethetypicalacronymsusedbyTelcopersonnel.We’veputthedefinitionunderthe

mostcommonlyusedacronym.Themostup‐to‐dateversionofthisglossaryisavailableatthe

Teloswebsitewww.telos‐systems.co

m

AMIAlternateMarkInversion.AT1linecodingmethod.Thisistheolderofthetwocommonly

available.Seelinecoding,T1.SeeAlsoB8ZS.

ANI–AutomaticNumberIdentificationAsystem,originallydesignedforusebyInterexchange

carriers(IECs),thattransmitsthe“billedpartynumber”alongwithacall.Notethatthebilled

partynu

mberisnotnecessarilythenumberofthelineplacingthecall.ANIpredatesSS7andcan

operatewithanalogaswellasdigitaltrunks.SeealsoCLIDandCallerID.

AsynchronousDataAformofserialdatacommunicationthatisnotclo

cked.Tokeepthebit

streamsynchronized,startandstopbitsareadded,whichcutsdownonthroughput.RS‐232

computerdataiscommonlyasynchronousdata.Incontrasttosynchronousdata.

BChannel‐BearerChannel.OneofthemultipleuserchannelsonanISDNcircuit.Usedtocarry

user’sdata;i.e.cod

edaudiodatainthecaseofZephyrorZephyrExpress.

B8ZS‐Bipolar8(with)ZeroSubstitution.AT1linecodingmethod.Thisisthemoremodernline

codingmethodofthetwocommonlyavailable.SeeLineCoding,T1.SeealsoAMI

BearerChannelSeeBChannel

BehindthePBXTh

isisourownterm,andreferstowhenoneprivatelyownedphonesystemis

tiedtoanotherprivatelyownedphonesystem.Themostcommonapplicationiswhenakey

systemisconnectedtoanalogportsofaPBX.WhenitinvolvesonePBXbehindanother,itisa

limitedTa

ndemapplication.SeeTandemSwitchandTandemTieTrunkSwitchingbelow.

BellLabs.ThebasicresearchfacilitythatwasAT&T’sprimaryresearchfacility.BellLabswas

originallypartofWesternElectricandwasspunoffwithLucentTechnologieswhenAT&Twas

brokenupin1984.Manyveryimportantdiscoveriesweremad

eatBellLabsincludingthe

transistor,communicationstheory,andradioastronomy.ThefutureofBellLabsseemsbleakat

thetimeofthiswriting.

BellOperatingCompany.SeeBOC.SeealsoRBOC.

Bellcore‐BELLCOmmunicationsREsearch.SeeTelcordia.Theresearchanddevelopment

organizationownedbytheRBOCs.BellcorerepresentstheRBOCsindevelopi

ngstandardsfor

Telcoequipmentandintestingequipmentcompliancetothosestandards.Bellcorealsooffers

educationalandtrainingprogramsopentoallinterestedparties.NowTelcordia.SeeTelcordia

BERT‐1)BitErrorRateTestAtestfordigitallineswhichinvolvesloopingadatapathand

sendingatestpattern

.Datareturningiscomparedtothesentdatatocheckforerrors.

Dependingonthe“TestPattern”used,BERTsmayormaynotuncoverproblems.Aline,which

onlyhasoccasionalproblems,willneedaBERTofsufficienttimedurationtocatchthat

intermittentproblem.Afivemin

uteBERTofanISDNBRIcircuitwillonlycatchsevereproblems.

2)BitErrorRateTesterThetestequipmentusedtoperformaBitErrorRateTest.

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