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To: rushnomore who wrote (27721)	7/17/2000 11:15:09 AM
From: Eric L	Respond to of 54805

rushmore, The Intel paper stated: << "Intel - re 3x - Both the DS and MC options are available in the forward link only. The reverse link supports only the DS option." >> You asked: << Which is the forward link? Is it phone-to-cell or cell-to-phone. >> This gets a bit complex but forward link refers to data being received by the mobile. An IS-95-B example is below (full article linked). IS-95-C changes the game somewhat as modulation is employed differently. >> cdg.org One of the most valuable IS-95-B improvements is the ability to provide CDMA data rates higher than the 14.4 kbps currently supported on QUALCOMM's CDMA systems. The IS-95-B specifications have been written so that manufacturers of subscriber units and infrastructure equipment can potentially support data rates of up to 115 kbps. This leap in data speeds is attained by aggregating up to eight CDMA traffic channels for data transmission (8 x 14.4 kbps = 1151 kbps). While data rates of 115 kbps will be possible with the IS-95-B standard, QUALCOMM anticipates that operator requirements will initially warrant support of data rates between 28.8 kbps and 57.6 kbps on the forward link, and 14.4 kbps on the reverse link. The forward link refers to data being received by the mobile, while the reverse link refers to data being sent from the mobile. The reason for this asymmetric support comes from the industry understanding that mobile, users generally receive more data than they send over the air. This concept can be understood within the context of browsing the World Wide Web or downloading e-mail, where the amount of data downloaded is usually much greater than the amount of data being sent out. << Dr. Viterbi discusses the confusing (to me) issue in this 1998 presentation and in a 1997 column. Viterbi Presentation: *The Path to Next Generation Services with CDMA* cdg.org Forward Link slides are toward the end. Viterbi Column: *CDMA: Past, Present, and Future* cdg.org Hope this is helpful. - Eric -