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Telos Zephyr Xstream Two-Way Radio User Manual

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USER’S MANUAL

Section 4: BASIC OPERATION & INSTALLATION 79

c

COMPATIBILITY TIP!

The Zephyr Xstream specifies the bit rate per channel. Since certain modes (i.e. stereo or

mono-128) require two channels to operate, the total (aggregate) bit rate would be double the

number displayed in these cases.

This is important as some other brands of codecs specify the total bit rate.

Sincethenetworkmustaccommodatetherateselected,itisimportanttohangup(i.e.dropthe

call)andredialifthisparameterischangedduringacall.

i

ISDN TIP!

Since this parameter specifies the bit rate placed over the dial up data network, it is

important to understand the following: In some areas of the USA & Canada, only 56kbps or

64kbps service may be available. In addition, since different network paths (trunk groups) are

sometimes used for the two rates, there are times where one rate may provide more reliable

connections than the other.

In our experience, the only sure way to know if a connections at a given between to particular

points will work, is to try it. First at 64kbps, and then at 56kbps, if the higher rate fails.

h

HOT TIP!

Since the network has to know the bit rate for a given call, this information is available to the

Xstream on incoming calls. Therefore, the Xstream will switch to the rate of the incoming

call.

There is one exception however. If the Xstream already has a call in progress at a given rate,

and a second call comes in (i.e. from a third codec) the unit will accept the call, but will not

change rate (since that would cause a loss of audio from the original site). There will be no

lock or audio from the site associated with the second call. In this case, the second remote

site should drop the call, change rates to match, and redial - All three units must be at the

same Bit Rate for this to work.

Sample Rate

Thisisthedigitalsamplerateusedfortransmission/receptionbythecodecsection.Notethat

thisratemayormaynotbethesameastheAES/EBUsamplerateusedontheinputoroutput.

SeeSection11(DetailedMenuReference)forinformationonusingtheAES/EBUports.The

sampleratemustbematchedbetw

eenyourZephyrXstreamandthecodecatthefarendfor

successfulaudiotransmission.

Ifthesamplerateisnotmatched,youwillhavenolock,intermittentlockloss,oraudiothat

soundspitchshifted.

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