Support User Manuals

Telos Zephyr Xstream Two-Way Radio User Manual

Open as PDF

of 381

USER’S MANUAL

Section 11: THE WORKS – Detailed Menu Reference 204

L3Mono128

ThisisthebestqualityLayer‐3modesupportedontheXstream.Audiopresent

ontheAinputwillbeencodedandtransmitted.ByusingbothBchannels(i.e.

128or112kbps)reducesthecompressionratiobyhalfandthereforegives

superiorfidelity.SincetwoBchannelsarerequiredhowever,thetransmission

costswouldbedoubl

ed.Iflengthysessionsaretobeperformedoverlong

distances,amodethatrequiresonlyasingleBchannelmaybedesirable.

UseL3Mono128whenmonotransmissionisneeded,transmissioncostsare

secondary,andthefarenddoesnotsupportAAC.

Thismod

eoffers15kHzaudiofrequencyresponseiftheSampleRateissetto

32or22kHzaudiofrequencyresponseiftheSampleRateissetto48kHz.

Z

ZEPHYR CLASSIC VS XSTREAM COMPARISON!

While the Zephyr Classic cannot transmit Layer 3 Mono-128, it can receive audio coded in

this way. Use the L3 Stereo Rcv mode to do so.

L3Dual/Mono

TheL3Dual/Monomodeisaspecialmode.L3Dual/Monomodegeneratestwo

L3Monoencodedstreamsat64or56kbpseach.Thefirststreamencodesthe

audioontheAaudioinput.ThisstreamisavailableonthefirstISDNBearer

channel(orV.35/X.21port)“Line1”.

Thesecondstreamisen

codedusingtheaudioontheBaudioinput.Thisstream

isavailableonthesecondISDNBearerchannel(orV.35/X.21port)“Line2”.

h

HOT TIP!

If you wish to feed identical audio down both channels you can do so by setting up the send

mixer section (MX/MXP models)appropriately, or by setting the Send Mix option to "A + B"

in the AUDIO menu (non-mixer model).

TheDualtransmitmodecanbeusedonthreeways:

• AsaL3"Mono64"mode.Inthiscase,onlyoneISDNchannelisdialedup

andtheaudiotobesentisfedtothecorrespondinginput.Thisuseisreally

asubsetofournextexample.

• Asa"2xL3Mo

no64mode".Inthiscase,thefirstISDNchannelisdialedup

to“siteX”andthesecondISDNchannelisdialedupto“siteY”.Inthiscase

previous next