Wow, does that take me back :) There used to be very similar arrays at RAF
Chicksands and other assorted Air Force comm detachments around the Midlands
area in the UK. Most of these were relocated/abandoned in the mid to late
80's though.
I was stationed at RAF Croughton, (Wideband/Satcom) and
For those AC only powered units, you can also purchase an invertor for DC to
AC conversion. You would then have the advantages of DC for your AC
equipment. This does, however, add the potential of another point of
failure such as fuses or breakers in the invertor.
- Original Message -
From: Wayne Bogan [mailto:[EMAIL PROTECTED]]
For those AC only powered units, you can also purchase an invertor
for DC to AC conversion. You would then have the advantages of DC
for your AC equipment. This does, however, add the potential of
another point of failure such as fuses or
| Not to mention additional cost of wasted electricity (which does add up
| significantly when it is anything but a spot solution) and pitfalls of
| inverters (like their imperfect sine waves). And if you're putting spot
| solution UPS units out into the bottom of a particular rack, be ware
Switched power supplies really don't care about the quality of the
sine waves that feeds them, as long as they have energy to put into
the tank. On the other hand, video monitors like sine waves, and
they may not get along with DC inverters/rectifiers (or even portable
AC no-breaks,
Basil,
If you recall, we talked about purchasing cogent access from you quite
some time ago, as Five Elements is also in the Switch Data facility.
If you need somewhere to off-load your AOL-bound traffic, we have some
excess Aleron transit, and they have AOL peering of some sort right in
The perceived money on the table frequently doesn't exist and attempts
to get it may produce the opposite result.
well, yeah, sure, but...
* Who they shift the traffic to may be your competitor.
...at least you know they are paying SOMEBODY, thus supporting the market
you want to be in.
On Sun, 2002-12-29 at 15:57, Jeff S Wheeler wrote:
Basil,
Oops. Obviously, I posted this to the list by mistake.
But in any case, for those of you who are relying upon cogent pricing
to make your business model work, it should be easy to figure out that
at some point, you might start getting
On Sun, 29 Dec 2002, Paul Vixie wrote:
The perceived money on the table frequently doesn't exist and attempts
to get it may produce the opposite result.
well, yeah, sure, but...
* Who they shift the traffic to may be your competitor.
...at least you know they are paying SOMEBODY,
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Hash: SHA1
- --On Sunday, December 29, 2002 00:46:56 -0500 [EMAIL PROTECTED] wrote:
Does anyone actually wire up
both the A side and B side to a single DC power supply and use diodes to
keep the two supply grids separate?
We've built a number of joiner
... if everybody who could peer in N places worldwide could just get
peering, then all kinds of per-bit revenue for high tier network
owners would turn into per-port revenue for exchange point
operators. ...
Well, I think as a local operator you can not expect to be able to
peer with
Well, if L3 is a transit provider, would it not make sense for them
to increase the peering pipes in order to bill their customers more?
I am sure there are some smiles there right now.
At 20:24 -0600 12/28/02, Basil Kruglov wrote:
Speaking of this whole Cogent/AOL/Level3 mess.. sigh.
I got
I love that Paul can be correct in an email and still make me smile.
The smile was the 1000x growth in internet traffic in a year.
Paul is right, this is a business case. Since most people in the
thread already make great points, I wont rehash them. I think this
is a standard peering
- Original Message -
From: Kuhtz, Christian [EMAIL PROTECTED]
To: Wayne Bogan [EMAIL PROTECTED]; [EMAIL PROTECTED]
Sent: Sunday, December 29, 2002 9:37 AM
Subject: RE: DC power versus AC power
But, as Stephen already eluded to... Compared with an AC plant design, to
me, one of the
Unnamed Administration sources reported that Michael Painter said:
But, as Stephen already eluded to... Compared with an AC plant design, to
me, one of the biggest drawbacks of a DC plant is safety (I have had to
kick a fellow worker away from the rack before).
What was the worker
Is 48V DC at the amps present normallyin switch rooms etc enough to cause
electricucian? I have seen bad things with wrenches dropped across
batteries even 12 volt car batteries although in this case it was a large
battery bank in a submarine but I was curious about the 48V sources in
switch
On Sun, Dec 29, 2002 at 09:12:16PM +, Paul Vixie wrote:
per-bit revenue for high tier network owners would turn into per-port
revenue for exchange point operators. where's the market in that? how
I think you just answered your own question. Exchange point operations.
could a high tier
On Sun, 29 Dec 2002, Scott Granados wrote:
but I was curious about the 48V sources in switch rooms.
Don't forget there's a quiet yet resourceful list over at
[EMAIL PROTECTED] They love talking about this kind of stuff.
Additionally I wonder why non-conductive tools wouldn't be the norm in
Unnamed Administration sources reported that Scott Granados said:
Is 48V DC at the amps present normallyin switch rooms etc enough to cause
electricucian? I have seen bad things with wrenches dropped across
batteries even 12 volt car batteries although in this case it was a large
battery
Unnamed Administration sources reported that Charles Sprickman said:
Additionally I wonder why non-conductive tools wouldn't be the norm in an
environment where there's an open power grid? :)
Fools rush in where.
It was in years past. I recall how excited the power room guys
were over
- Original Message -
From: Scott Granados [EMAIL PROTECTED]
To: [EMAIL PROTECTED]; nanog list [EMAIL PROTECTED]
Sent: Sunday, December 29, 2002 3:40 PM
Subject: Re: DC power versus AC power
Is 48V DC at the amps present normallyin switch rooms etc enough to cause
electricucian? I
Unnamed Administration sources reported that Scott Granados said:
Is 48V DC at the amps present normallyin switch rooms etc enough to
cause
electricucian? I have seen bad things with wrenches dropped across
batteries even 12 volt car batteries although in this case it was a
large
On Sun, Dec 29, 2002 at 08:11:46PM -0500, David Lesher wrote:
I'm surprised you're still around after a sub battery accident.
They're a grade up from most CO's in available current, I'd bet.
I'd bet the other way. CO battery has to supply ring current, dial
tone and voice current, not just
While I would normally think some of this exaggeration. When I was
at Netrail, I did a road trip to upgrade a facility in DC. It's
kinda amazing what passed for colo in those days. The little UPS
actually had a string of Pet boys car batteries. Nathan Estes
dropped a wrench into the
Yes it will the wrench will become litterally liquid and spray. So no it
doesn't explode in the litteral sense but it appears to and also sounds like
it:). A safe experiment to do which many people probably did as Kids is to
take a piece of tin foil and place it across the terminals of say a
Just some musings...
Been watching this discussion for a couple loops now. I have to say you're
both right on certain things, and that each individual design has to be
done on the merits of the need for 100% uptime vs what's tolerable.
AC is always easier to run, as the conductors are smaller
Unnamed Administration sources reported that Michael Painter said:
I've laid across the buss-bars before...definitely an uneasy feeling, but never
felt it unless I was sweaty. g
Capability of thousands of Amps, but it's the old power transfer
deal...internal resistance of the source vs.
Unnamed Administration sources reported that Barney Wolff said:
I'm surprised you're still around after a sub battery accident.
They're a grade up from most CO's in available current, I'd bet.
I'd bet the other way. CO battery has to supply ring current, dial
tone and voice current,
Absolutely. Often, there are more than a few hundred amps available.
Remember, many of those switch rooms were built to specs to drive a very
large number of solenoids, relays, etc. All relatively high-current
devices compared to today's solid state stuff. Alot of the specs were
never reduced,
Thus spake Wayne Bogan [EMAIL PROTECTED]
For those AC only powered units, you can also purchase an invertor for DC
to
AC conversion. You would then have the advantages of DC for your AC
equipment. This does, however, add the potential of another point of
failure such as fuses or breakers
Thus spake Scott Granados [EMAIL PROTECTED]
Is 48V DC at the amps present normallyin switch rooms etc enough to cause
electricucian? I have seen bad things with wrenches dropped across
batteries even 12 volt car batteries although in this case it was a large
battery bank in a submarine but I
It only takes 30ma to put your heart into atrial fibrillation. In the usa,
gfi's are set to trip at 5ma.
Normally 48VDC wouldn't be considered a 'lethal' voltage (I've talked to
telephone technicians who said they used to play a game in the CO by wiring
a handle to 90V ring voltage and seeing
On Sun, 29 Dec 2002, Paul Vixie wrote:
The perceived money on the table frequently doesn't exist and attempts
to get it may produce the opposite result.
well, yeah, sure, but...
* Who they shift the traffic to may be your competitor.
...at least you know they are paying
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