Ascend Archive
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Re: (ASCEND) [Off subject] Learned the hard way....
On Fri, Jul 10, 1998 at 12:04:07PM -0700, Kevin A. Smith wrote:
> OK, I just learned the hard way that ISDN is no damned good if the
> power goes out. Luckily I still have an analog line and DUN on my laptop
> so I'm not totally dead....
Actually, "real" ISDN can deal well with a powerout. When the NT
at the customers premises loses power, it starts emergency power
feeding to the end devices on the S0 bus. End devices that don't need
power feeding at all (Notebook with ISDN card) or telephones that can
live with emergency power feed (which is limited) will still operate.
Off course,
1) The US way to install ISDN is to omit the NT. Dunno whether any
protocols are defined for emergency power supply on a Uk0, but
I heavily doubt that there are.
For us germans _that_ is SEP (a term usually US guys have for
the problems of us germans ;)
2) Devices like the Pipes will of course not run with emergency power
feeding. But that's not really an ISDN problem, is it ?
3) Somewhat more comfortable telephones will not run with emergency
power, either. My telephone is actually a mini PBX allowing to connect
up to 6 DECT mobile phones and two analogue devices. Of course it
cannot run with emergency power, DECT eats too much power.
==> It's still a good idea to have a UPS.
--
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