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 cablesOK 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
LuthmanSent: Monday, August 26, 2024 4:20 PMTo:
AnimalFarm Microwave Users Group
mailto:af@af.afmug.comSubject: 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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