ISP Information:
An international standard for packet switching, typically used with older telephone networks for data communications. See frame relayISP Glossary:
X.25 - Steven Christensen wrote: Hi all, I am considering dropping my land-line service and moving to an all-cell approach. But I have no clue how much time my wife and I spend on the (local) phone. Is there a device I could hook up to simply measure the amount of timeWhen the phone on on hook, there is about 48 VDC betwen the red andgreen wires. Whan a phone is off-hook, the voltage is about 5 to 12volts, depending on the phone. Wire a relay with a series resister sothat the relay drops out at about 20 volts. Use it to control an ordinary110 volt clock.Jim Van Nuland, San Jose (California) Astronomical Association
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