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Telos Zephyr Xstream Two-Way Radio User Manual

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USER’S MANUAL

Section 12: System Functions and Remote Control 245

12 System Functions and Remote Control

12.1 Ancillary Data

Serial Data Transmission

TheserialinterfacecanbeusedtocontroltheZephyrXstream,i.e.tochangetransmission

modesorrequeststatusinformation.ATelnetsessioncanalsobeusedtoperformthis

function.

Theserialinterfacecanbeswitchedtotransparentorancillarydatamodeusingtheatdt

command.

Whilethetra

nsparentmodeisactive,alldatasenttotheZephyrXstream'sserialinputis

insertedintothecodedaudiosignaland–providedthereisanvalidISDN,V.35,orIPconnection

–transmittedtothereceivingZephyr.Thelatterwillextractancillarydatainformationfromthe

codedaudiosignalandou

tputitonitsownserialinterfaceifitisintransparentmode.

• Theancillarydatatransmissionisfullybi‐directionalanddoesnotaffectany

ongoingaudiotransmission.Thenecessarybitratetotransmitancillary

data,however,istakenfromtheoverallavailablelinebitrate.

• AncillarydatathatisfedintotheZephyrXstreamwithouthavinga

conne

ctionwillbelost.

• InDual/Monotransmitmodeancillarydataistransmittedtobothsites.In

Dual/Monoreceivemodeancillarydataline2isignored.

• Theancillarydatachannelisanon‐demandservice,whichmeansthatthe

audiobitrateisonlyreducedifnecessary.However,datacanbe

transmittedcontinuouslyatupto9600kbps(St

ereoandMono‐128)or

2400kbps(Mono‐64andstereo‐64).Seebelow.

• Ancillarydataisonlyavailableincertainmodes,asoutlinedbelow:

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