ISP Information:
Bytes per second.
ISP Glossary:
Bps - Why's that? I'm not a network-side guy, but it seems to me that the local system just needs to talk to its own VLR to find out what it needs to know about you. All the phone is doing is sending up a data burst (encapsulated in one of several ways, depending on the system and the length of the message and the phase of the moon), which wouldn't seem to be a process requiring any special contact with the home network.In article ,Spyros Bartsocas wrote: I am not a very technical person, but you program a Service Center to the phone.That must be the equivalent of a Message Center (MC henceforth) in theIS-41 world (I assume you're talking about GSM, where I *really* knownothing about the network side). It makes sense that the SMStransaction would need to go through whatever SMS entity "owns" thetarget phone, I guess. The service center phone number includes the country code in order to be reachable from other networks. So, I believe what happens is that you are actually calling this number (at least it appears this way last time I roamed in Switzerland).That's *really* interesting, and doesn't seem to be the case in IS-41,where the various MSCs just talk to each other. I'm looking at IS-41as I write this, trying to figure out how the process works; everytime I think I've understood it, I start to write a summary and thendiscover that I'm wrong. My current thinking -- which I'm going towrite down and send in a hurry before I have a chance to change mymind -- is that the sender's MC always has to contact the recipient'sMC, but policy for which network the MCs are located on is left up tothe carriers.In principle, if I'm right, a roamer *could* be associated with an MCon the local network, and then delivery of SMS would be routed justlike a call -- caller's MSC checks with recipient's HLR which directsit to the appropriate VLR, which indicates how to deliver thenotification. But the roamer could also be "owned" by his home MC, inwhich case the sender has to talk to HLR, then VLR, then back to the"home" MC, which gives back a routing address (by consulting the HLR),and *then* the message gets routed accordingly (presumably notinvolving the roamer's home network any more).There isn't an actual *call* involved, in the sense of a process thatinvolves assigning a mobile onto a traffic channel and sending trafficaround, but maybe the MC generates its own CDRs, which then show up ascalls on your bill.Can anyone give a definitive, succinct explanation? This is welloutside my field, but it's got me curious, particularly about thedifferences between GSM and IS-41.Nathan Tenny | When the world ends, there'll be no moreQualcomm, Inc., San Diego, CA | air. That's why it's important to pollute | the air now. Before it's too late.| -- Kathy Acker
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