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Telos Zephyr Xstream Two-Way Radio User Manual

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USER’S MANUAL

Section 4: BASIC OPERATION & INSTALLATION 77

4.3 Codec Settings: Transmit, Receive, Bit Rate, & Sample Rate

WhencallinganotherISDNcodec(e.g.mode=Zephyr),thesesettingsmustbesetcorrectlyto

achieveanend‐to‐endbi‐directionalaudioconnection.Sincethisisjustanintroduction,wewill

justbrieflytellyouwhateachis.Formoreinformation,seeSection11(detailedMenu

Reference).Section6(Au

dioCodingReference)coversthedifferenttransmissionmodesin

detail,includingtheadvantagesanddisadvantagesofeach.

NOTE:Whenplacingacalltoatelephone(mode=Phone),ortoaZephyrXportthatisonaPOTS

line(mode=Xport)thissettingscanbeignored.

Transmit

Thisdeterminesth

eformatoftheaudiolocallycodedfortransmission.Inorderforthefarend

toreceivethisaudio,thefarendcodecmust:

1) Supportthistransmissionmode;and

2) Musthaveits"Receive"(or"decoder")modesetappropriatelytoreceivethe

modebeingsent.

3) Thebitratean

dsampleratesettingsmustbematchedbetweenthetwoends.

c

COMPATIBILITY TIP!

The AAC and AAC-LD standards are new, and are not supported by older codecs. When

communicating with older equipment, you must make some other choice.

The G.722 transmit mode is the most widely supported standard. The majority of codecs

support this mode. Since it has the lowest delay, it is frequently used for return feeds and IFB.

Receive

ThisinstructsyourZephyrXstreamtodecodeaparticularmodebeingtransmittedfromthefar‐

endcodec.

TheeasiestoptionhereistosetReceivetothe“Auto”setting.Thismodewillattemptto

determinethemodebeingsentfromthefarend,andinternallysettheReceivemodetomat

ch.

Allyou'llneedtodoisbesureyourSampleRate(seebelow)ismatchedtothefarend.The

modeselectedwillthenbedisplayedonthedefaultmenuandthecodecstatusscreensoyou

cannoteitforfuturereference.

Astheautomodetakesseveralsecondstodet

erminethecorrectmode,therearetimesyou

maywishtouseaspecificsettingforReceive.Inthiscase,yourReceivemodemustbesetto

decodethestreambeingsentfromthefarend.

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