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To: engineer who wrote (11068)	6/3/1998 9:54:00 AM
From: JMD	Respond to of 152472

engineer, thanks so much (damn this is getting scary, I'm starting to understand this stuff or at least that's my illusion :) I'm hip to "it's a packet world" and finally am clear on the distinction between circuit switching and packet switching. So far so good. Now when you describe those big mutha T-1, T-3 etc. as giant packet switchers, I get a little foggy. I thought those T thingies were just big, fast pipes down which all those zillions of data packets just flew. Now you're saying they don't just conduct the packets but also traffic route them? Thought that was what TLAB did with their digital cross connect, CSCO with their hubs and routers, all that stuff. Very cool post and much appreciated, engineer. Mike Doyle

To: engineer who wrote (11068)	6/4/1998 1:09:00 AM
From: Joe NYC	Respond to of 152472

Engineer, Re: the CDMA radio is really just a great packet modem What do you think about the following article: teledotcom.com The transition from circuit-switched networks will not be easy for service providers. "Installing packet switching in the network for third-generation wireless i s a substantial network upgrade," says Paul Schofield, senior product manager for wireless data at Telstra Corp. Ltd. (Sydney, Australia). Of the three technologies being deployed and considered by wireless service providers today, only one is inherently data-enabled. Code-division multiple access (CDMA) and time-division multiple access (TDMA) are less packet-ready than global system for mobile communication (GSM), says Cole. Omnipoint is now using GSM to deliver data over circuit-switched networks at speeds of up to 14.4 kbit/s. In the next 12 to 18 months, Omnipoint and other service providers will start carrying GSM data over packet-switching facilities, pushing data rates up to 64 kbit/s using today's technology. Do you know of any CDMA service providers out there providing (or are planning to provide) pocket data? It seems that the only practical application of pocket data at this point is analog based CDPD. Joe