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Telos Zephyr Xstream Two-Way Radio User Manual

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USER’S MANUAL

Section 10: APPLICATIONS GUIDE 172

AlsonotethatLayer‐3hasmoredelaythanLayer‐2whichhasmoredelaythanAAC.AAC‐LD

followswithG.722havingtheshortestdelay.

Notethatforagivenbitrateandsamplerate,thatAACoffersthebestfidelity,followedby

Layer‐3andAAC‐LD,followedLayer‐2,an

dfinallybyG.722.

AsaZephyrXstreamuser,youhavethebestofallworlds.Layer‐2,Layer‐3,andG.722offer

backwardscompatibilitywitholdercodecs,whileAACandAAC‐LDallowbetterqualityor

reduceddelay.

10.3 Applications Guide

Voice-over applications on a single B channel (1 call)

Good:

UseL3Dual/MonoTransmit‐FarendwoulduseL3Mono(Ze

phyr)orL3Dual/Mono(Zephyr

Xstream)Receive.

Use32kHzsamplerateforbestfidelity.

Best Quality:

UseAACMono64transmit‐FarendshoulduseAAC64forReceive



Voice-over applications using two B channels (2 calls)

Good:

UseL2Mono128Transmit–FarendshoulduseL2Receive(ZephyrorZephyrXstream)at48kHz

samplerate.

Better:

UseL3Mon

o128Transmit–FarendshoulduseL3(ZephyrXstream)orL3Stereo(Zephyr)

Receive.

Usethe32or48kHzsample(bothendsmustmatch).

Best:

UseAACMono128Transmit–FarendshoulduseAACReceive.

Either32or48kHzcanbeusedforthesa

mplerate(mustmatchonthebothends).

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