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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 207

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COMPTIBILITY TIP!

The Zephyr Xstream cannot receive two stereo feeds from the far end (after all, where would

the audio be output?).

When connected to two different sites simultaneously, you can receive an audio feed back

from each using G.722 or L3 Dual/Mono.

AACStereo

AACJ‐Stereo

TheseworksimilarlytotheequivalentLayer‐3modes(seeabove).Two

connectionsarerequired.Thesemodesareimportantsincetheyofferthebest

qualityeveroverasingleISDNBRIcircuit.

Offers15kHzaudiofrequencyresponse,whenthesamplerateissetto32kH

z

and20kHzresponsewhenthesamplerateissetto48kHz.

AACMono128

ThisusesbothBchannelstransmitasingleaudiochannelusingtheaudiofrom

inputA.

Offers15kHzaudiofrequencyresponsewhenthesamplerateissetto32kHz

and20kHzresponsewhenthesamplera

teissetto48kHz.

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COMPATIBILITY TIP!

When two channels are required for transmission (i.e. for Stereo, J-Stereo, and Mono 128) an

"inverse multiplex" (IMUX) scheme must be used to break the standard MPEG data stream

into two streams for transmission.

In AAC and AAC-LD, the Zephyr Xstream uses the Telos Zephyr IMUX protocol.

AACMono64

ThisencodesasinglemonobitstreamusingtheAaudioinput.Thisbitstream

isfedtobothISDNBchannelssoitcanbetofeedidenticalmonototwosites.

Offers15kHzaudiofrequencyresponsewhenthesamplerateissetto32kHz

and20kHzresponsewhenthesamplera

teissetto48kHz.

G.722(Dual/Mono)

Compatiblewithmanyotherbrandsofcodecs.WeusetheSRT(Statistical

RecoveryTiming)method,whichisthemostcommonencounteredbyfar.

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