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Technology Stocks : Loral Space & Communications
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To: Rocket Scientist who wrote (3593)6/2/1998 10:21:00 PM
From: Reagan DuBose  Read Replies (1) of 10852
 
Hi, RS; welcome to SI!

My comment to Maurice wasn't intended to address any propagation delay question. It was to chide him a bit about his stating that G* "wasn't twice as high", when it was in fact 1.8 times as high as Iridium. In talking about ROM (rough order of magnitude) numbers, I wouldn't pick on someone for calling a factor of 1.8 an approximate doubling.

The 5 millisec difference you mention certainly isn't going to be a very significant difference between the total latency of G* and I*. There are other delays which could be more significant.

I doubt that G* will use GEO relay transmissions for voice data, and certainly not for their premium voice service. Might do so for data, paging, control signals, etc.

Iridium delays from the RF link between their birds will also probably not be very significant. However, if data is transmitted in packets and buffered at each transciever, there could be significant delays between receipt and re-transmission. Multiply that by possibly several birds in the link between caller and destination, and you could have a perceptible delay. Might depend on traffic loading as well (longer digital queue -> longer delay).

G* call routing through terrestial links is also not free of such delays. It would be interesting to know how the guaranteed maximum delay of G* compares with I*. Does anyone on the channel know?

Reagan
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