Mel;
You are absolutely right. I should have been more specific in my
description of the problem.
On Thu, Jan 31, 2019 at 1:27 PM Mel Beckman wrote:
> Fletcher,
>
> I don’t think that’s true. I find no specs on fiber dB loss being a
> function of ambient temperature. I do find fiber optic
“Sold you fiber , not working fiber” is at the same time amazing lawerying
and insanely facepalmy. :)
On Thu, Jan 31, 2019 at 11:48 Fletcher Kittredge wrote:
>
> Cold changes the transmission characteristics of fiber. At one point we
> were renting some old dark fiber from the local telephone
] On Behalf Of Mel Beckman
Sent: Thursday, January 31, 2019 12:26 PM
To: Fletcher Kittredge
Cc: North American Network Operators' Group
Subject: Re: Effects of Cold Front on Internet Infrastructure - U.S. Midwest
Fletcher,
I don’t think that’s true. I find no specs on fiber dB loss being
Fletcher,
I don’t think that’s true. I find no specs on fiber dB loss being a function of
ambient temperature. I do find fiber optic application data sheets for extreme
temperature applications of -500F and +500F (spacecraft). You’d think if
temperature affected fiber transmission
Cold changes the transmission characteristics of fiber. At one point we
were renting some old dark fiber from the local telephone company in
northern Maine. When it would get below -15%-degree F the dB would get bad
enough that the link using that fiber would stop working. The telephone
company
Excessive cold killed us once when the air exit vents froze shut.
From: NANOG [mailto:nanog-bounces+david.hiers=cdk@nanog.org] On Behalf Of
Naslund, Steve
Sent: Wednesday, January 30, 2019 9:43 AM
To: nanog@nanog.org
Subject: RE: Effects of Cold Front on Internet Infrastructure - U.S
On Wed, Jan 30, 2019 at 9:07 AM Christopher Morrow
wrote:
> And here I always figured it was bespoke knit caps for all the packets in
> cold-weather climes?
> learn something new every day! (also, now I wonder what the people who
> told me they were too busy knitting caps are ACTUALLY doing??)
>
Re: Fire
Also fire dept response.
I've ridden with the Boston Fire Dept, extreme cold is a major PITA,
hydrants freeze, you have to work in it going from the heat of the
fire to sub-zero air temps over and over, all while getting soaking
wet, and wind-chill is certainly a factor.
There were
Well said. The electrical load shifts, hydraulic systems, airflows
constrained by ice cover, etc, etc, etc. All kinds of things being asked to
do stuff outside or at the edge of specifications.
Hug your local facilities guys when these things happen. (Or bring them
booze.)
On Wed, Jan 30, 2019
>And apparently fire. I wasn’t going to chime in but one of my >providers
>*just* alerted us to an electrical fire in a Minneapolis pop >causing loads to
>failover to ups. Unknown whether weather >conditions contributed to the
>incident.
Yes, in Chicago we will see an increase in home fires
Ironically you don’t really save a lot of energy when it’s this cold because
the loops are running at high speed and the humidification coils are working
overtime to keep the RH up in the room.
People think we can bring in all the outside cold we want but the issue then is
humidity stability.
On 30/Jan/19 19:37, Naslund, Steve wrote:
>
>
>
> A good HVAC team is critical because we have noted that the building
> management systems often are not flexible enough to automatically deal
> with super extremes and require some human intervention to tell them
> to do things like run heat
And apparently fire. I wasn’t going to chime in but one of my providers
*just* alerted us to an electrical fire in a Minneapolis pop causing loads
to failover to ups. Unknown whether weather conditions contributed to the
incident. PZ
On Wed, Jan 30, 2019 at 09:25 Naslund, Steve wrote:
> >To the
>Exactly what he said. We actually run cooling and supplemental heating >in
>extreme cold. We need to keep the chiller pulling heat into itself and >pumps
>moving on high to keep the outdoor components from freezing >up. During the
>summer you might run close to or slightly below freezing
>To the 'infrastructure' question, I think the biggest concerns would >be power
>related. Although we have a DC in Buffalo that is cooled >on ambient outside
>air that has the opposite problem ; it's TOO cold >at the moment, so we are
>cycling most of the hot server exhaust >back into the
The main issue is infrastructure like power, cable damage, and heating/cooling
systems.
Power lines tend to go down because anything weak becomes brittle and any
accident involving a pole tends to cause them to break rather than absorb
impact. Also, conduits and manholes that normally might
To be fair, reporting the the wind chill factor is very meaningful for
health and safety reasons almost everywhere so proper warning is given
about people spending time outside. Minneapolis, and the bigger Canadian
cities have those inside walkways and pedestrian pathways, but they're not
that
And here I always figured it was bespoke knit caps for all the packets in
cold-weather climes?
learn something new every day! (also, now I wonder what the people who told
me they were too busy knitting caps are ACTUALLY doing??)
On Wed, Jan 30, 2019 at 8:55 AM Bryan Holloway wrote:
>
Approximately 3 hrs ago we lost B-feed at Minneapolis Cologix.
Apparently the local utility requested that they move one side to
generator due to the weather and high-utilization, and the ATS failed.
But we're up ...
On 1/30/19 10:50 AM, Mel Beckman wrote:
Being a Minnesota native, I can
Being a Minnesota native, I can tell you that while it is indeed cold, this is
nothing new i the Great White North :) I am amaze a how consistently the media
overplays the severity of Midwest cold weather as some kind of unique
phenomenon. They amplify this by reporting the wind-chill factor,
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