Robustel M1000 Pro V2 Spezifikationen PDF herunterladen (Seite 44)

RobustelGoRuggedM1000ProUserGuide

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RT_M1000Pro_UG_v01.01 27.12.2011 43/59

Confidential

Note:

The above mentioned values  represent the theoretically maximum possible values for a GPRS device. For an EDGE

device,valuesfourtimesaslargemaybeassumed.

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Inpractice,thefollowingapplies:

GPRSwillnotprovideguaranteeddataratesorbandwidthsfortheapplication.Thevaluesallocatedbythenetwork

provider(codingschemeandtimeslots tobeused)canchangedynamicallyduringaconnectionanddepend,among

otherthings,onthecurrentamountofconnectionsintheGSMcell.

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4.2.3 Delay

Usually,therewillbemarginallyhigherdelaysthanwitha"normal"connectionviaGPRS.

The delayswill mostly be below one second. The average delay times are stated with 700 ms. Basically, delays  of

several seconds are possible; the applications at the GPRS enddevicesshould therefore be set to maximumdelay

times,ifpossible.

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4.3 TypicalApplications

4.3.1 TCPClientMode

In TCP Client mode, the M1000 Pro can actively establisha TCP connection to apre‐defined host computer when

serialdata  arrives.After thedatahas beentransferred,the M1000Procanautomaticallydisconnectfromthehost

computerbyusingtheInactivitytimesettings.

Asillustratedinthefigurebelow,datatransmissionproceedsasfo llows:

(1)TheM1000Pro,configuredforTCPClientmode,requests aconnectiontothehost.

(2)Oncetheconnectionisestablished,datacanbetransmittedinbothdirections betweenthehostandtheM1000

Probidirectional.

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Robustel M1000 Pro V2 Spezifikationen Seite 44