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: [email protected]: 8/30/2024 10:05:42 AMTo: "AnimalFarm
Microwave Users Group" Subject: Re: [AFMUG] fiber patch cablesThe browser-tab
title goes here
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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
Support: [email protected]? 705-640-0556 | TF:
844-444-4249
Direct: [email protected]?
705-646-1846 x583 | https://www.lakelandnetworks.com/faqs/
Lakeland Networks
?
From: AF
<[email protected]> On Behalf Of Josh LuthmanSent:
Wednesday, August 28, 2024 9:12 AMTo: AnimalFarm Microwave Users
Group <[email protected]>Subject: Re: [AFMUG] fiber patch
cables
?
'
?
EXTERNAL Email
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CAUTION:
This email originated from outside the organization. Exercise caution when
clicking on links or opening attachments even if you recognize the sender.
Totally missed that last part XDThere 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
<[email protected]> wrote:
Because he used metric, or
because he spelled it metre?---- Original Message ----From: "Josh
Luthman" Sent: 8/28/2024 7:40:18 AMTo: "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 <[email protected]> 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 <[email protected]>
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 <[email protected]> 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 <[email protected]>
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 <[email protected]>
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 <[email protected]>
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:[email protected] On Behalf Of
Josh LuthmanSent: Monday, August 26, 2024 4:20
PMTo: AnimalFarm Microwave Users Group
mailto:[email protected]: 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
<[email protected]>
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
<[email protected]>
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
<[email protected]>
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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