On dinsdag, sep 2, 2003, at 20:22 Europe/Amsterdam, Scott Bradner wrote:
Perhaps, perhaps not. I live in Ontario Canada and in the recent
blackout, my phone kept working.
i.e., you did not have a ISDN or wireless phone
The telco can provide power over the ISDN line for a single device on
the ISDN bus if that device can operate under the necessary
restrictions. (This power is so limited that it takes several seconds
for the phone to become operational in emergency power mode.)
But what good does it do to have DC on your phone line if the network
is utterly congested? With IP the service level degrades more
gracefully. (Although this wouldn't necessarily work well for _voice_
over IP.)