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Telos Zephyr Xstream Two-Way Radio User Manual

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USER’S MANUAL

Appendix 6 – Special Operational Modes 317

Bit Rate

(per stream)

8 12 14 16 18 20 24 32 40 48 56 64 80 96 112 128

Allowable

Streams

15 15 14 14 14 13 13 13 11 10 9 7 6 5 3 2

Theformulaforestimatingtherequiredbandwidthrequirementis:

RequiredBandwidth=NumberofUnicastListenersx(encodedaudiostreambitratex1.1)

ThefollowingtableshowsestimatednumbersoflistenersforeachInternetconnectionstyle,

assuminga16Kbpsencodedaudiobitstreamrate(thisdoesnotimplythisnumberstreamsare

supportedbytheXstream,however):

Connection Type Bandwidth Listeners

ISDN Basic Rate 128Kbps 8

T1 1.5Mbps 90

Ethernet LAN (10Mbit) 7 Mbps (10Mbps x .7) 350

T3 45 Mbps 2,700

Ethernet (100Mbit) 70 Mbps (100Mbps x .7) 4,000

Ofcourse,youmaynotwishtoallocateallofyouravailablebandwidthtoaudiostreaming.

STREAMING DEFINITIONS

PullOnly

Theconnectioninthistypeofstreamisinitiatedbythelistener(client).The

clientcontactsthesender(server),requestingastreamtobesent.Theserver

sendsastreamtotheclient,andthecli

entsendsnofurthermessagestothe

serveruntiltheuserdisconnects.Atdisconnecttime,theclientsendsa

messagetotheserverrequestingthatnomoredatabesent.

PushOnly

Theaudiostream,inthisinstance,isinitiatedbythesender.Theuserspecifies

theclienttowhichtosendth

estream,andthedataissentwithoutany

negotiation.Theclientdecodestheaudioitissent,buthasnocontrolover

whenitstartsorstops.Thestreammustbedisconnectedbythesend‐sideuser.

Bi‐directional

Usessomecombinationoftheabovetoinitiateastreaminbothdi

rections.The

userateitherendcaninitiatetheconnection,andthesoftwarewillnegotiate

boththepushandthepullinvolved.Eitherend'susercanlikewisedisconnect

thecall.

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