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RE: BBN (GTE) Suffers another major power problem.
- From: Rodney Joffe
- Date: Fri Aug 08 23:17:59 1997
> -----Original Message-----
> From: Jonah Yokubaitis [SMTP:firstname.lastname@example.org]
> Sent: Friday, August 08, 1997 2:08 PM
> To: Nathan Stratton
> Cc: Matthew White; email@example.com
> Subject: Re: BBN (GTE) Suffers another major power problem.
> Incorrect. Stop using AC equipment in your pops. Use DC equipment and
> get a _good_ DC Powerplant. Every carrier Class4/5 switchroom usually
> has 10-20,0000 AMP/hours of standby power. 1 DSC or Nortel switch
> sucks _quite_ a bit more power than even the largest of superpops.
> Every carrier has _at least_ 4hours of battery plant (most have 8-12).
> Relying on generators is a _bad_ idea.
> Its not hard to have 4-12hours of standby battery plant.
> Lucent/Lorain/Peco2 all make rather nice rectifiers, and
> C&D/Lucent/GDB all make some nice vented batteries. By going DC you
> also don't get hit with the inefficiencies of AC --> DC --> AC --> DC.
> You can bet that MCI/Sprint don't have a piece of AC equipment in
> their facilities and most likely are laughing their asses off right
Not quite as simple Jonah.... CO equipment is designed for 48v for many
reasons. It's also designed to deal with concrete floors, inefficient
HVAC, dust, etc.
Unfortunately, a modern megapop consists of a lot of interesting
equipment that doesn't come in 48v DC versions. Alpha 8400s, Large SGIs,
and server like things (yeah, I know, there are companies who make
retrofit kits for some of them, but they're not standard).
The real issue is planning... MAE E and MAE W *weren't* designed for the
things that MFS is stuffing in them. Most of the other pops have the
same problem. It *is* possible to design a facility that is run off an
inverter permanently, which is connected to a UPS, which is connected to
utility power, and to a diesel generator, which *is* able to cope with
extended failures of _utility power_ without affecting the equipment
(routers, switches, modems, and servers) at all. And I think the modern
facilities will be built that way. 4-12 hours of batteries is serious
when you're talking about a large hosting facility. Sprint/MCI may be
laughing, but they're haveing to scramble to build POPs capable of
supporting server farms because they can't do that now.
And another thing, batteries or not, *no-one* can easily survive a
catastrophic event like a fire, an explosion, or even the wires that got
eaten in BBNs Stanford center last year. (Didn't AT&T hose most of
Chicago's loop area a few years ago, for more than a *week*?) I bet they
had DC in their vault. Didn't help them much...
Genuity Inc., a Bechtel company