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Technology Stocks : Texas Instruments - Good buy now or should we wait?
TXN 191.57+1.3%Jan 16 3:59 PM EST

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To: JMD who wrote (3062)2/14/1998 10:08:00 PM
From: SteveG  Read Replies (1) of 6180
 
<... I'd also love to know how some signals can always be 'on'--like cable and broadcast tv while others require you to establish a connection..>

The cable wires that go from your home or business to the telco's CO (central office) termnate into a line card that connects into a PSTN voice switch. Based on old estimated averages for a phone call, the switches allow for approximate 25% of the CO's cable to be active at a given time. This allowed significantly lower cost, since the average call was 10 mins, and rarely were more than 25% of a CO's customers "on hook" at any given time. If they WERE, as during a local emergency, you would often find your local CO's switch to be busy (the fast ringing "circuit-busy").

The routing of ADSL lines will bypass the PSTN (and voice networks) and go directly onto the backend data networks. Netspeed markets a "digital off-hook" technology which will step down/off your ADSL connection until you activate it. This will offer a similar kind of rationed use of ADSL (as with the PSTN), with corresponding decreases in telco equipment costs.

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