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Telos Zephyr Xstream Two-Way Radio User Manual

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USER’S MANUAL

Appendix 10 – Glossary 346

BillingTelephoneNumberThemainphonenumberwhichallcallsonhuntgrouporaPRIare

billedto.ThisinformationmayberequiredwhenconfiguringaPRIPBX.

BitErrorRateThebasicmeasureoferrorsondigitaltransmissionpaths.Itisusuallyexpressed

asthenumberoferrorspernum

berofbits.Forexample,theallowablebiterrorrateonaBRI

circuitis1x10E7(onebiterrorin107bitsor1errorin10millionbits).

BitErrorRateTestSeeBERT

BitRateThecapacityofadigitalchannel.ISDNcallsaresetupatagivenbitrate,ei

ther64Kbps

or56Kbps.Thebitrateofacircuit‐switchedconnectioncannotbechangedduringacall.See

Kbps.

BLECBuildingLocalExchangeCarrier.ALECwhocoverstheoccupantsofasinglebuilding(ora

smallgroupofbuildings)only.OftenTelecomservicesareprovide

dbyaBLECasaserviceor

incentivetopotentialtenants.IfaBLECoffersLongDistanceServiceitiscoveredbythesame

regulationsasanyotherLEC.

BlockingWhenacircuitswitchedcallcannotbecompleted.Thepercentageofblockedcallsto

thenumberofcallsattemptedformsthebasisofasta

tisticcalled“gradeofservice”.Whileitis

economicallyinfeasibletobuildanetworkthatwouldhavenoblocking,theTelcosareheld

accountablebytheutilitycommissionstokeepblockingbelowtariffedlevels.Theconceptof

blockingcannotbeappliedtopacketnetworks(theyju

stlosepackets,instead),onlycircuit

switchednetworks.

BlueAlarmAlsocalledanAlarmIndicatingSignal(AIS).Akeep‐alivesignalsentifaproblem

occursmid‐spaninaT‐carriersystem.Thebluealarmsignalisrequiredbecauseinsomecases

T‐1repeaterswillbecomeunstableifinadequate1'sdensityisnotmaintained.

BOC‐BellOpe

ratingCompanyOneoftheregionaltelephonecompaniesthatwereownedby

AT&Tbeforedivestiturein1984(i.e.NewEnglandTelephone,OhioBell,etc).The22BOCswere

dividedamongtheRBOCsatdivestiture.SeeRBOC.

BothWayTrunksseecombinationtrunks.

BRIreferstoISDNB

asicRateInterface‐ThecommonformofISDNwith2“Bearer”Channels

andone“D”channel.Allthreechannelsareonasinglecopperpairandencodedwithtype2B1Q

coding.

BRITE‐BasicRateInterfaceTransmissionExtension.AtechnologywhereordinaryT‐1trunks

(oranyotherdigitalcarriersystem)areusedtoextendISDNBRIservice.BR

ITEuses3DS0

channelperBRI‐OneforeachBchannelandonefortheDchannel.SeeRepeater.

BTNSeeBillingTelephoneNumber.

BusinessOfficeThepartofthephonecompanywhereyoucalliftheymessupyourbill,to

reportproble

ms,andtoorderservice.Notnecessarilytechnicallyliterate.

CalledPartyAddressThisisthedestinationphonenumberofacalldeliveredtoaswitch.For

instancethiscouldbetheCLIDofacalldeliveredtoaPBXusingDIDortwo‐waytrunks.Seealso

DID.

CallerID

ACLASSfeatureonananaloglinethatprovidesthenumberofthecallinglineasa

burstofFSKdata(modemtones)followingthefirstring.AlsocalledCallingLineIdentification.

SeealsoCLASS.

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