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Technology Stocks : Qualcomm Incorporated (QCOM)

QCOM 178.29

-1.6%

Dec 12 9:30 AM EST

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To: JMD who wrote (4997)	10/27/1997 1:37:00 AM
From: Asterisk	Read Replies (1) of 152472

Yes Cellular calls always get connected to the wired world infrastructure. However, that infrastructure could be satellite, fiber, or microwave link. It does not necessarily have to be copper. In some places the copper that is put in the ground is worth so much that scavengers some and take the wire for scrap. But if you put down fiber you have a much greater call handling capacity and noone cares about a strand of glass. For instance if there is an area that has a bunch of people in it then you can set up a system that has a hub made up of a satellite connection. Then to each of the cells you run a strand of fiber, or whatever. In this way you can have a small "splotch" of coverage in the middle of nowhere. However, in the case of Nextel I really don't know how their specialized radio works, it may be that when calling from handset to handset they do not need to connect to a cell. When you turn your cell phone on you immediately make a connection with the nearest cell. That is when your ESN (Electronic Serial Number) is transmitted and when thieves can catch and clone your phone. Once you have a connection you are passed from cell site to cell site as you drive along. That is how even if you are not currently in a call the central computer can narrow you down to the area of one cell site. This is also why cell phones have standby time. They are still expending their battery energy with the cell sites (and idling internal circuitry) even if they are not in a call. If your phone is off then you will not be "in the system" and noone can take your ESN. But when you turn it back on then you give the ESN up again.

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