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Telos Zephyr Xstream Two-Way Radio User Manual

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USER’S MANUAL

Section 11: THE WORKS – Detailed Menu Reference 224

TheV.35SplitworksthesamewayastheV.35modeontheZephyrclassic.The

sameInverseMultiplexing(IMUX)methodwillbeusedasiftheInterfacewere

settoISDN.ThecodecselectionsinV.35SplitarealsothesameasforISDN.

Notethatthelinestatuswordsonthedefau

ltTelmenushavedifferent

meaningswhenV.35isselected(seeabove).SeeAppendix6(Special

OperationalModes)formoreinformation.

V.35Single

ThisselectionwillenabletheXstream'sbuilt‐inV.35/X.21interface,ifpresent.

Section9(V.35/X.21)hasmoredetailsontheoperationoftheV.35interface.

InSi

ngleV.35modeasingleMPEGcompliantbitstreamisgeneratedand

outputoverbothV.35ports.NotethattheLinestatuswordsonthedefault

menuandtheTelmenuhavedifferentmeaningswhenV.35isselected.See

Appendix6(SpecialOperationalModes)formoreinformation.



w

IMPORTANT!

The following selections in the CODEC menu will have different options when the Interface

is set to V.35 Single.

• Transmit

• Receive

• Bit Rate

See Appendix 7 (Special Operational Modes) for additional Information.

ThisselectionaddsadditionalflexibilitytotheXstream.Forexample,asingle

128kbpsdedicatedsynchronouscircuitcouldbeusedinsteadoftwo64kbps

circuits.

Thisalsoallowstransmissionofaudioat128kbpsandhigher(upto384for

Layer2andAAC,andupto256kbpsforLayer3).Operatingatsuchreduced

compressionratiosgivemax

imum"codingheadroom"forfurtherperceptual

codingcycleselsewherethetransmissionchain.And,ITU"indistinguishable

quality"audioisachievedwithmanyofthecodingalgorithmsatthehigherbit

rates.

Z

ZEPHYR CLASSIC VS XSTREAM COMPARISON!

The Zephyr classic's V.35 interface supports only the V.35 Split mode of operation.

You asked for the ability to send a single 112 or 128 kbps bit stream. The Xstream offers this

via the V.35 Single mode, as well as rates up to 384 kbps for use when quality is critical, or

multiple coding cycles are anticipated.

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