Drove me nuts too. In college they had us start with Motorola processors and
end with Intel. Very early days of the 8080/6502 stuff. I think I even worked
on a 4004 once.
From: Bill Prince
Sent: Friday, August 30, 2024 5:02 PM
To: AnimalFarm Microwave Users Group
Subject: Re: [AFMUG] fiber patch cables
I have nightmares about a software package that was originally written for
MS-DOS (little endian), then converted to Windows (also little endian), then
converted to Mac OS (big endian). I was tasked with converting it to Unix on a
MIPS processor, which could switch-hit between big and little endian. There
were like a bazillion flags in the code where endianness was indicated to the
compiler. I decided to follow the Mac OS, and mainly had to find where the
flags needed to key our compiler. Weird s***t happened when the endianness was
zigging when it should have been zagging.
--
bp
part15sbs{at}gmail{dot}com
On Fri, Aug 30, 2024 at 2:45 PM Robert <[email protected]> wrote:
I was such a h/w processor guy for so long, most of my system names still
have -le or -be in the name...
On 8/30/24 1:13 PM, Shayne Lebrun wrote:
Absolute reference vs seconds-since-epoch.
Next I’ll screw up a big endian-little endian conversion.
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 mailto:[email protected] On Behalf Of Bill Prince
Sent: Friday, August 30, 2024 2:25 PM
To: AnimalFarm Microwave Users Group mailto:[email protected]
Subject: Re: [AFMUG] fiber patch cables
'
EXTERNAL Email Disclaimer
CAUTION: This email originated from outside the organization. Exercise
caution when clicking on links or opening attachments even if you recognize the
sender.
You were mixing imperial and metric years.
--
bp
part15sbs{at}gmail{dot}com
On Fri, Aug 30, 2024 at 10:36 AM Shayne Lebrun
<[email protected]> wrote:
You’re right, excuse me, 1966, which was 58 years ago, and my poor brain
got the two numbers mixed up.
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 [email protected]
Sent: Friday, August 30, 2024 11:05 AM
To: AnimalFarm Microwave Users Group <[email protected]>
Subject: Re: [AFMUG] fiber patch cables
'
EXTERNAL Email Disclaimer
CAUTION: This email originated from outside the organization. Exercise
caution when clicking on links or opening attachments even if you recognize the
sender.
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 Luthman
Sent: Wednesday, August 28, 2024 9:12 AM
To: AnimalFarm Microwave Users Group <[email protected]>
Subject: Re: [AFMUG] fiber patch cables
'
EXTERNAL Email Disclaimer
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 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 <[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 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 <[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
Luthman
Sent: Monday, August 26, 2024 4:20 PM
To: AnimalFarm Microwave Users Group
mailto:[email protected]
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 <[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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