OptiFiber® Pro OTDR – Running a Test Part 1: By Fluke Networks

OptiFiber® Pro OTDR – Running a Test Part 1: By Fluke Networks


(Adrian Young) So we’re ready
to set our launch compensation. Go ahead and tap “Tools”
and “Launch Compensation.” There are 4 types of launch
compensation. There’s launch only, which you shouldn’t be doing today.
You should always be using the tail fiber and that’s what we’re doing. So go ahead and select the
second option, “Launch + Tail.” That third option, “Launch + Fiber
+ Tail”, is one of those instances, if you forget to do this, you drive
to the other end of your fiber link, and you think, “Ugh, I forgot to do this.”
This tester is smart enough to set the launch compensation when
you’re actually attached to the fiber. The fourth option is “Manual Entry.”
Always use this option if you’re testing links
that have APC connections in there. Now the reason why is, the launch
compensation works on by looking at the first reflective event.
APCs can be so good, they don’t have a reflective event.
And then the tester complains, It can’t find the launch event,
or, “It can’t find the tail event.” By telling the tester specifically
where the end of the launch fiber is, and where the tail fiber begins,
then we’ll put the marker at that location and mark the event at that location.
So we’re ready, set, go ahead and tap “Set.” And you’ll notice on here,
the OTDR port connection quality is shown every time. That tells me
my OTDR port connection is good. So on the screen here, we see
the length of our launch fiber, and the length of our tail fiber.
I think we’re pretty much good to go. So go ahead and tap “Save.” And it’s given us the,
“Hey, you just set this.” And we’re going to record the date
that we set this. So that’s good.
Tap “Okay.” And tap “Home.” Now, if you watched our CertiFiber Pro
video, you would’ve noticed that one of the most important things I said
when you were setting up the test reference cords was to verify
how good the test reference cords are. And we’re going to do that right now.
So go ahead and hit the “Test” for me. So they’re still connected together as if we were doing
the Launch + Fiber Compensation. The OTDR port connection quality is good,
that’s recorded with every test result. If it’s not good, that’s going to have
a negative impact on your test results. Now, the tester is going to complain here that,
“Hey, there’s something not right here.” Because it’s expecting the launch fiber,
the fiber that you’re testing, and the tail fiber. We’ve only got the launch and
the fiber here. The tester is smart enough to know that something’s
not quite right here. That’s okay. We’re just verifying the launch cords
here. Tap “Okay” for me. And you’ll see the event map.
Now on the event map here, you’ll see a loss and
a reflectance value. What’s the loss value on there
at the moment, Amanda? (Amanda)
0.16. (Adrian Young)
That’s a pretty nice value. It’s around in that 0.15 dB value
that we’re looking for. That’s not the most important
value here though. The value that I really want
to take a look at is reflectance, below that. So what’s that
reflectance number there? (Amanda)
-15.78. (Adrian Young)
That’s pretty nice numbers. Essentially, when you’re doing
Multimode, we want this verification here to be at least -40 dB.
If you’re doing Singlemode, we want that number to hit -45 dB. So we know our launch
and our tail fibers are good. And this is another advantage
if using launch and tail fibers. If you just use launch only,
there’s no way to verify if your launch fiber
is any good or not. So then when you go test,
and you start seeing problems, you don’t know if it’s the installation
or whether it’s your launch fiber.

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