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Technology Stocks : Qualcomm Moderated Thread - please read rules before posting -- Ignore unavailable to you. Want to Upgrade?

To: John Biddle who wrote (20138)	3/9/2002 2:37:05 PM
From: rkral	Read Replies (2) \| Respond to of 196633

>>"1x capabilities are limited by running over GSM MAP" and "1x on GSM MAP" The words "over" and "on", used in the above context, are unintentional implicit references to the term 'layer' in the OSI Reference Model ("RM"), imho. I won't try to explain the RM, but it does help in thinking about GSM1x. For the RM, while a higher layer depends upon a lower layer, the reverse is not true. Therefore, a dependence test quickly reveals what is "running over" what. While the RM is intended for communications protocols (software), it is helpful for hardware viewpoints as well. Enough about the RM per se. From an OSI RM viewpoint, GSM1x is GSM "running over" cdma2000 1x ("1x"). The GSM network services available are determined at the GSM 'application layer'. The services usually available in a 1x network are irrelevant. The capacity (throughput) of the GSM network is currently limited by the GSM air-interface, the OSI 'physical layer'. A transition from GSM to 1x air interface would yield a 4-fold to 12-fold increase in capacity. (While the capacity limitation of the GSM air-interface is true, the capacity of the GSM MAP would likely need to be increased also.) I will be surprised if the GSM cabal takes the GSM1x bait offered by Qualcomm. There may some uptake in China, but I am not familiar with that situation. Useful links which I've not seen posted; Qualcomm's GSM1x block diagram at: qualcomm.com and Qualcomm's GSM1x Overview at: qualcomm.com and Qualcomm's most recent voice capacity slide at: qualcomm.com and a little about OSI at: erg.abdn.ac.uk (first site found, better probably exist) If I'm preaching to the choir or just stating the obvious, I apologize. Ron