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Telos Zephyr Xstream Two-Way Radio User Manual

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USER’S MANUAL

Appendix 10 – Glossary 361

SynchronousDataAformofserialdatawhichusesaclocksignaltosynchronizethebitstream.

Since,unlikeasynchronousdata,nostartandstopbitsareused,datathroughputishigherthan

withasynchronousdata.ISDNandT‐1useSynchronousdata.SeealsoAsynchronousData.

T‐LinkAproprietaryTelos2.048mbpschanneli

zedlink.ThislinkusestheDSX‐1electrical

protocolandhas30channelsat64kbpseach.

T1AcommontypeofdigitaltelephonecarrierwidelydeployedwithintheUS,Canada,and

Japan.Has2464Kbpschannels(calledDS׎’s).ThemostcommonframingschemeforT1“robs”

bitsforsignal

ingleaving56kbpsperchannelavailablefordatause.

T‐1AnalternativeexpressionforT1.SeeT1.

TA‐TerminalAdaptor.TheelectronicinterfacebetweenanISDNdeviceandtheNT1.The

terminaladapterhandlesthedialingfunctionsandinterfacestotheuser’sdataequipmentas

wellastotheNT1onthe“S

”or“T”interface.

TandemSwitchAswitchwhichisbetweentwoothers.Itconnectstwotrunkstogether.Long

distancecallsonaLEClinegothroughalongdistancetandemthatpassesthemthroughtothe

longdistanceprovider’sswitch.

TandemTieTrunkSwitchingWhenaPB

Xswitchallowsatielinecalltodialoutoftheswitch.

Forexample,ifswitch“A”inArkansashasatielinetoswitch“B”inBoise,Boisecouldusethetie

linetomakecallsfromswitch“A”.

TD‐TransmitDataDatacomingfromtheDTEtoward

stheDCEornetwork.Also,alightona

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

TEI‐TerminalEndpointIdentifierAnOSILayer2identifierusedbyanISDNterminalto

communicatewiththeservingCO.MostequipmentusesadynamicTEIassignmmentprocedure

.

Telco‐TelephoneCom

panyYourlocaltelephoneserviceprovider.Inthe21stcenturyyou

generallyhaveachoiceofTelcosifyouareabusinessinamajormetropolitanareaintheUSA.

CompetitioniscomingtotheTelecomindustryaroundtheworld.

TelcoSetting(Xstream,Zephyr,TWO,TWOx12)Themenuselectionwhereth

eISDNprotocolis

selected.Choicesare'NatlI‐1'(forNationalISDN),'DMSCust',(forDMS‐100CustomFunctional

ISDN),'AT&TCust'or'PTP'(forAT&TCustomPoint‐to‐Point),'INS64'(forJapaneseISDN)and

'ETS300'(forEuro‐ISDN).

TelcordiaTechnologiesFormerlyBellcore.Theresearchanddevelopmentorganizationowned

byth

etelephonecompanies.Telcordiarepresentsthephonecompaniesindeveloping

standardsforTelcoequipmentandintestingequipmentcompliancetothosestandards.

Promotescompetitionandcompatibilitythroughstandardspromotinginteroperabilitysuchas

GR‐303.Telcordiaalsoofferseducationalandtrainingprogramsopentoallinterestedparties.

BellcorewassoldtoSAICin1997.Telco

rdiaisresponsivetobothRBOCsandindependent

Telcos.Theirwebsiteis:http://www.telcordia.com.SeeGR‐303

TelephoneNumberSeeDNandMSN

TelosCustomerSupport+1216.241.7225.Generallyavailablefrom9amto6pmEST,butyou

cantryatothertimes.Youmayalsoaskforassistancebye

mailingtosupport@telos‐

systems.com

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