I remember going on a sales call to British Telecom in the 1990s with
the head of my company's intl division, who was a raving lunatic. He
had driven 20 miles the wrong direction and was trying to make up time
so we didn't miss our flight out of Heathrow.
I saw the speedometer read 100 and thought we were going to die, but
calmed down when I realized it was kph not mph.
A few days later it occurred to me we were in England and it was
actually 100 mph.
---- Original Message ----
From: ch...@go-mtc.com
Sent: 8/30/2024 10:05:42 AM
To: "AnimalFarm Microwave Users Group"
Subject: Re: [AFMUG] fiber patch cables
The browser-tab title goes here v\:* {behavior:url(#default#VML);}
o\:* {behavior:url(#default#VML);} w\:* {behavior:url(#default#VML);}
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I am surprised that it even existed in 1958 as that program was not
even announced until the 1960s.
*From:* Shayne Lebrun
*Sent:* Friday, August 30, 2024 8:54 AM
*To:* AnimalFarm Microwave Users Group
*Subject:* Re: [AFMUG] fiber patch cables
Say, did you know that the Apollo Guidance Computer, from the first
iteration in 1958, did all of it’s internal calculations in metric,
then converted to imperial for display to the astronauts?
So yes, America went to the Moon on metric.
*Shayne Lebrun *
Senior Systems Analyst
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*From:*AF <af-boun...@af.afmug.com> *On Behalf Of *Josh Luthman
*Sent:* Wednesday, August 28, 2024 9:12 AM
*To:* AnimalFarm Microwave Users Group <af@af.afmug.com>
*Subject:* Re: [AFMUG] fiber patch cables
'
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Totally missed that last part XD
There are two kinds of countries: those that use the metric system
and those that have been the moon.
On Wed, Aug 28, 2024 at 8:52?AM Ken Hohhof <khoh...@kwom.com> wrote:
Because he used metric, or because he spelled it metre?
---- Original Message ----
From: "Josh Luthman"
Sent: 8/28/2024 7:40:18 AM
To: "AnimalFarm Microwave Users Group"
Subject: Re: [AFMUG] fiber patch cables
OK Euro guy...let the American's get the job done.
On Tue, Aug 27, 2024 at 11:59?PM Ryan Ray <ryan...@gmail.com> wrote:
We use EXFO otdr's on some spans that are 160km and we can get
it down to the metre.
On Tue, Aug 27, 2024 at 7:07?PM Josh Luthman
<j...@imaginenetworksllc.com> wrote:
Don't you document where your splices are? If you see
your splices every 33k and see it's broken 1 mile from the
last splice it should be pretty obvious, no?
On Tue, Aug 27, 2024 at 6:26?PM <ch...@go-mtc.com> wrote:
Magical device called a fusion splicer. Our reels
were typically 33,000’
*From:*Josh Luthman
*Sent:*Tuesday, August 27, 2024 3:51 PM
*To:*AnimalFarm Microwave Users Group
*Subject:*Re: [AFMUG] fiber patch cables
I don't see how you have a 50 mile span. Even if you
get 80k reels that's 15 miles.
On Tue, Aug 27, 2024 at 5:19?PM <ch...@go-mtc.com> wrote:
When you have spans up to 50-75 miles at times,
you have to use longer high power pulses. There is
a lot of variability in velocity of propagation,
earth temperature, splice slack loops, fiber
twist. 1 mile error over 50 miles is only 2%.
You can easily be off by several thousand feet.
You can’t just go dig. You have to go to the
closest splice point and test again, even then if
you it show the fault 2000 feet away and you dig
at 2000 feet you may be off by 20 feet or more. I
have been doing this for decades. Takes lots of
digging to actually find it.
*From:*Josh Luthman
*Sent:*Tuesday, August 27, 2024 3:01 PM
*To:*AnimalFarm Microwave Users Group
*Subject:*Re: [AFMUG] fiber patch cables
A mile?! IDK how that's possible. Every time we
turn a new splitter on the sequentials and OTDR
are within a few feet - we lose a couple of feet
in butt splices and our sequentials end up wrong.
Every new reel gets tested on delivery and it's
right on.
When we had a broken fiber (ants) it was right on
the case. When we had a broken fiber (ribbon got
knicked with installation) it was between two cases.
On Tue, Aug 27, 2024 at 3:48?PM <ch...@go-mtc.com>
wrote:
Wow, sometimes looking for gopher damager over
20 miles I have been off a mile.
*From:*Josh Luthman
*Sent:*Tuesday, August 27, 2024 1:30 PM
*To:*AnimalFarm Microwave Users Group
*Subject:*Re: [AFMUG] fiber patch cables
So far every time we've used the OTDR it's
been accurate within 1 foot.
On Tue, Aug 27, 2024 at 12:55?PM Trey
Scarborough <t...@3dsc.co> wrote:
The only thing you have to worry about
with shorter cables is the reflection. In
some instances with dirty connector at
just the right connector you can get
reflection back in to the transmitter that
can cause errors, the tx to shut down or
premature failure. This is very uncommon
with LR 10G and less optics and can be
prevented from making sure you have clean
connectors. Check the RX and TX levels and
make sure you don't have excessive loss.
With 100G its a little different story due
to the combined power of multiple
channels, but still can be prevented by
cleaning connectors, but in some instances
Ive had to use attenuation when mixing
different vendor optics.
The using no launch on an OTDR most
automatically calibrating OTDRs will work
without one. Your results can be off
though. Most of the lower cost ones are
also lower powered and have less of an RX
sensitivity so they don't suffer as much
from the reflections interfering when
testing. I can test all day long with my
little otdrs without one, but my long
range 200k+ units I have to have a minimum
of a 1k spool on it or you see ghosts.
They will show up as repeating events at
even intervals. Not something you will see
on shorter runs either.
On 8/26/24 4:31 PM, Ken Hohhof wrote:
I should note that apparently I used
to do this with direct attach cables
(DAC) but I think that was a pain, one
more thing to stock and to bring with
for projects. Whereas I’d always have
boxes full of SFPs and fiber patch cords.
*From:*AF
mailto:af-boun...@af.afmug.com *On
Behalf Of *Josh Luthman
*Sent:* Monday, August 26, 2024 4:20 PM
*To:* AnimalFarm Microwave Users Group
mailto:af@af.afmug.com
*Subject:* Re: [AFMUG] fiber patch cables
People say you need a launch cable but
our cheap china OTDRs have no issues
seeing the connector at the end of the
patch cable and stuff beyond. I
bought a big launch cable back in the
day and never use it anymore.
Might be different with AE?
On Mon, Aug 26, 2024 at 5:16?PM
<ch...@go-mtc.com> wrote:
Only minimum length I know of is
the OTDR dead zone. If that is a
problem you purposely lengthen the
cable with a launch cable.
*From:*Josh Luthman
*Sent:*Monday, August 26, 2024 1:59 PM
*To:*AnimalFarm Microwave Users Group
*Subject:*Re: [AFMUG] fiber patch
cables
Reddit is wrong. Gasp.
Connectors are loss, there is more
loss in either one of the
connectors than there is the
single mode glass.
Between a switch/router in a rack
what I see all the time is long
(like 5/10/15 feet) cables and
then put the slack in a loop along
the posts.
On Mon, Aug 26, 2024 at 1:19?PM TJ
Trout <t...@voltbb.com> wrote:
Patchbox makes some great
products, their fiber system
is pretty slick but expensive.
Cable length is irrelevant
it's optical budget / Rx
signal strength. Normally on
2-20k LR optics you are ok
with any length cable, 40km+
needs a pad on short spans.
(Attenuator)
On Mon, Aug 26, 2024, 8:29?AM
Ken Hohhof <khoh...@kwom.com>
wrote:
Is there a minimum length
for a single mode fiber
patch cable?
I have been using 1 meter
cables and they are almost
always too long, I’m
talking about going
between routers and
switches in a rack, stuff
like that. I see that FS
sells 0.5 meter cables,
but I saw somewhere like
maybe on Reddit someone
claiming there was a
minimum length. Given SM
fiber and LR optics, I
don’t see how 0.5 or 1.0
meter would be different
they are both essentially
zero length.
Probably there’s some kind
of cable tray or cable
management solution I
could be using but I’ve
never liked such things.
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