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To: Asterisk who wrote (9288)	3/18/1998 2:17:00 PM
From: w molloy	Read Replies (1) \| Respond to of 152472

<To look at the same footprint and geographical area I think you may want to look to Hutchison in Hong Kong. > Can you tell me what frequency bands the GSM and CDMA networks use? <The basic structure of TDMA in fact is not digital> urrgh - fainting spell :-) You are right in that : 1. A TDMA (Time Division Multiple Access) signal is switched on and off 2. A CDMA (Code Division Multiple Access) signal is spread across the whole of an allocated band. We are now in the splitting hair region. Let me split a couple and call it quits. The input to the physical domain (the air interface) in both cases is digital. So is the output. So in my mind, both systems are digital. I could argue that CDMA is analog (other handsets sharing a frequency band with my handset looks like noise to my handset, noise is a very 'analog' quality) but it is pointless. The basis for perceived CDMA superiority has to be based on capacity, ease of network rollout and maintenance etc. Note that these attributes are from the network providers standpoint. Your average Joe Phone-User doesn't give a toss, as long as his phone is small; battery lasts forever; his call isn't dropped and is relatively cheap. Using TCP/IP per se as an argument for CDMA over TDMA is false (IMO) <I think that CDMA as a system was more intrinsically designed to be a data system than TDMA.> I would have to disagree. IMHO, data in both these system comes along for the ride. CDMA and GSM are both primarily voice systems. Look at both specifications and see how they offer various degrees of voice compression, the trade off being between voice quality and system capacity. CDMA was designed to have a capacity advantage over GSM. I guess we will have to ask Messr's Viterbi or Jacobs to confirm :-) w.