| Message-ID: <tqukji$ch4$1@usenet.csail.mit.edu>
Date: 26 Jan 2023 19:34:10 -0000
From: "Garrett Wollman" <wollman@bimajority.org>
Subject: Re: Status of Copper Based Landline Telephones
In article <20230125201741.GA1374974@telecomdigest.us>,
Bill Horne <malQRMassimilation@gmail.com> wrote:
> In the U.S., it's common to find business Internet connections that
> depend on AC power to operate, which go dead during a power
> failure. Since most elevators here also run on AC, any widespread
> power failure leads to tens or hundreds of people stranded in
> elevators, and, if the emergency phones in those elevators require
> Internet connections to work, also unable to call for help.
In some jurisdictions, buildings where elevators are mandatory are
also required to have backup power sufficient to return those
elevators to the recall floor. Of course that does not do much for
older buildings that were never retrofitted, and I'm not sure what
requirements are imposed on the emergency phones specifically.
This is brought to mind by the fact that our building was closed for
two days this past month in order to perform preventive maintenance on
the automatic transfer switch, which required shutting down utility
power and doing a manual transfer for generator loads. Much of my
core network equipment is on generator power, as well as a UPS, but
the office switches and anything powered by them (desk phones and
wireless access points) are not.
-GAWollman
--
Garrett A. Wollman | “Act to avoid constraining the future; if you can,
wollman@bimajority.org| act to remove constraint from the future. This is
Opinions not shared by| a thing you can do, are able to do, to do together.”
my employers. | - Graydon Saunders, A Succession of Bad Days (2015) |
| Message-ID: <tr003k$1jj6u$1@dont-email.me>
Date: 27 Jan 2023 08:56:36 +0100
From: "Marco Moock" <mo01@posteo.de>
Subject: Re: Status of Copper Based Landline Telephones
Am 25.01.2023 schrieb Bill Horne <malQRMassimilation@gmail.com>:
> In the U.S., it's common to find business Internet connections that
> depend on AC power to operate, which go dead during a power
> failure. Since most elevators here also run on AC, any widespread
> power failure leads to tens or hundreds of people stranded in
> elevators, and, if the emergency phones in those elevators require
> Internet connections to work, also unable to call for help.
That is a huge problem. In Germany IIRC they now use cellular mobile
network (2G, 4G or 5G) as a backup.
Analog phone lines have some advantages. 😄
|
| Message-ID: <tqv3tn$1lm$1@shakotay.alphanet.ch>
Date: 26 Jan 2023 23:55:35 -0000
From: "Marc SCHAEFER" <schaefer@alphanet.ch>
Subject: Re: Status of Copper Based Landline Telephones
Bill Horne <malQRMassimilation@gmail.com> wrote:
> failure. Since most elevators here also run on AC, any widespread
> power failure leads to tens or hundreds of people stranded in
> elevators, and, if the emergency phones in those elevators require
> Internet connections to work, also unable to call for help.
Here, the phone systems in the elevator are usually running on
batteries, in case of power failure. It would be however be interesting
to know if:
- the VoIP routers also run on batteries
- if FTTS, the MicroCAN in the street either have batterie or are
tele-powered via old phone lines from a phone central
which has a generator or batteries
The devil is always in the details.
|
