Globalstar Telecommunications Limited GSAT Message Board

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Microcap & Penny Stocks : Globalstar Telecommunications Limited GSAT

GSAT 62.81

+1.7%

12:46 PM EST

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To: Maurice Winn who wrote (16875)	9/16/2000 11:48:54 PM
From: dwight martin	Read Replies (1) of 29987

This, from the website previously posted, is Q* describing how G* calls are routed. There is a picture which makes clear that both ends of the conversation are G* phones. qualcomm.com A subscriber in Russia is calling her friend in San Francisco on her Globalstar satellite phone. Her signal is handled by a passing satellite. The satellite relays the call to a Gateway in its footprint. The Gateway converts the signal to work with the local PSTN and passes on the call. Depending on the distance between the callers, a Globalstar satellite call might pass through several Gateways and PSTNs before locating the receiving phone. The PSTN uses the call's routing information to connect to another Gateway that knows where the receiving phone is located. The Gateway located closest to the receiving phone converts the signal to Globalstar format and uplinks it to a satellite. This Gateway knows that the receiving phone is in its contact area because an earlier satellite relayed that phone's power-on registration message to the Gateway. This information was stored in the Gateway's Visitor Location Register (VLR). The call is relayed to the receiving phone and the call linkage is complete! If the VLR has any real use, shouldn't it be shared in RT between all the gateways? And if all the gateways know which gateways all active G* phones are to be served through, why would a call have to "pass through several Gateways and PSTNs before locating the receiving phone?" Why wouldn't the first gateway go directly to the serving gateway for the receiving phone via the PSTN? Is it possible that the calls are given the most economical routing? Or is it something else?

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