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Telos Zephyr Xstream Two-Way Radio User Manual

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USER’S MANUAL

Appendix 10 – Glossary 358

PrimaryRateInterfaceAformofISDNwith23“BChannels”andone“Dchannel”.All24

channelsareonasinglecable.FunctionallyrelatedtoT1telephonecircuits.InEuropePRIhas30

“BChannels”andone“DChannel”andone“Syncchannel”.SeealsoBchannelandDchannel.

Provisi

oningTheactofconfiguringanISDNorothertelecommunicationspath.Alsorefersto

thecompletelineconfigurationinformation.

PS2PowerPowerprovidedonpins7and8ofthe“S”interfacecable.Thispowerisusedso

thataNT1canprovidepowertoaterminal(usuallyaphone).Insomecases,itisusedtoallowa

terminaltopoweranNT

1.TheUSAversionsoftheZephyr,ZephyrExpress,supplyPS2powerin

the“S”jack.TheZephyrXstreamandTelosTWOprovidethisonallversions.Thispower

arrangementisalsousedintheTelosTWOx12and2

101StudioInterfacetopowerDesktop

Directors.

PTP(USA)AT&T“CustomPointtoPoint”CustomISDNProtocol.Point‐to‐Pointlineshaveonly

oneincomingphonenumberwhichmustbedialedtwicetoconnecttobothlines(thefirstcall

goesto“line1”andthesecondcallrollsoverto“Line2”.SeeCustomISDNandISDNProtoco

l.

QoS(QualityofService)istheabilitytoprovidedifferentprioritytodifferentapplications,

users,ordataflows,ortoguaranteeacertainlevelofperformancetoadataflow.Forexample,

arequiredbitrate,delay,jitter,packetdroppingprobabilityand/orbiterrorratemaybe

guarantee

d.Qualityofserviceguaranteesareimportantifthenetworkcapacityisshared,

especiallyforreal‐timestreamingmultimediaapplicationssuchasLivewire

TM

.

RBOC‐RegionalBellOperatingCompany(USA)Oneoftheregionalcompaniesformedwhen

AT&Twasforcedoutofthelocaltelephonebusiness.EachRBOC(or“babybell”)ownsanumber

oftheformer“BellOperatingCompanies”.TheBellOperatingCompaniesarethetraditional

localphonecompanies(pre‐1984),exceptwhereone’sserviceisfr

oman“Independent”(non

bell)telephonecompanyoraCLEC.DuetotheirformerassociationwiththeBellSystemRBOCs

areregulatedbytheFCCdifferentlythanareindependentTelcosorCLECs.Inmanycasesthe

BellOperatingCompanystructureisnolongerused.Forinstance,hereinOh

iowenowdeal

directlywiththeRBOC,Ameritech,whiletheoldBellOperatingCompany,OhioBellTelephone,

nolongerexists.AnothertrendismergersamongtheRBOCs(andinsomecasesthe

independentsaswell).SeeCLECandLEC.

RD‐ReceiveDataDatacomingfromthenetwork,orDCEtowardstheDTE.Als

o,alightona

modemorCSU/DSUthatlightstoindicatepresenceofthissignal.

RedAlarmAnalarmstateonaT‐carriercircuitthatindicatesthattheincomingsignal(atthe

networkinterface)haslostframeformorethanafewseconds.NormallyaYellowalarmisth

en

returned(i.e.sentback)ifaRedalarmispresent.ARedAlarmindicatesalossofinboundsignal;

aYellowalarmindicates(indirectly)alossofoutboundsignal.SeealsoYellowalarm,Bluealarm,

andLOS.

RegionalBellOperatingCompanySeeRBOC

RepeaterAdeviceintendedtoextendISDNtelephoneservicetositesfurtherfr

omthecentral

officethancouldnormallybeserved.i.e.:beyond18,000feet.ISDNrepeatertechnologies

include“BRITE”,“VirtualISDN”,“Lightspan”,and“TotalReach”.SomeTelcosdonotuse

repeaters.CompatibilitybetweenagivenNT1(CPE)andarepeaterislesscertainthanifth

at

CPEwheredirectlyconnectedtotheswitch.

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