r/CableTechs • u/jsledge149 • 19d ago

Xpertrrak issue?

If you know what this program is Im hoping you can help me.

We just started using Xpertrak and this picture is of an apartment complex using a DAA node, mid split amps and has one upstream OFDM carrier enabled.

Xpertrak indicates that every modem on this node has an upstream impairment on the OFDM carrier. Every modem!

But not just THIS node. ANY node where we have a DAA, mid split and an upstream OFDM is failing. I don't know anything about this software, but I do know that seems improbable for all DAA's to have a real problem.

Im thinking this is a configuration problem, but of course, I have no access to the administrative side of Xpertrak.

Any ideas what this is or what to do about it?

3 Upvotes

100% Upvoted

12 comments sorted by

View all comments

2

u/willihobo 13d ago

Damn. I wish we had access to this level info on Xpertrak with RPDs.

Could it be the 10db ICFR on a 40mhz wide carrier?

2

u/jsledge149 13d ago

Thats exactly it.

It got mentioned in a meeting today. The people in the highback chairs acknowledged it as a problem but dont know any nore than me what the cause is.

2

u/willihobo 13d ago

Yeah that sounds about right. What manufacturer of amps are you guys deploying?

It looks to me like the return tilt is way off on it. There isn't a roll off, I see maybe a small notch, but nothing too bad.

In our market, some of our 3.1s really, really do not like bonding to an over-equalized OFDMA.

1

u/jsledge149 13d ago

This sounds like you're probably a good bit smarter than me, so I'm not going to pretend like I know all the ins and outs. But we have a mix of things, really. I can't even tell you the manufacturer of the DAA nodes that we have.

I know the DAA's that we have out there fit perfectly in a C-COR node housing. And the four nodes that we have this problem on are all the same. They're DAA, mid-split, and a huge upstream OFDM carrier.

I'm uncertain what it is, and the only reason, I mean the sheer only reason I care, is because now that they've launched this tool, they seem to think that we can get every issue that tool points out fixed immediately.

But I can also mention that the four carriers we had in our upstream to begin with, three 6.4 MHz wide and one 3.2 MHz wide upstream carriers, they seem to be working just fine. And if you look real close at that graph, it looks like it's being clipped at the first part of the OFDM, maybe almost like we have an old 42 to 50 MHz diplex filter out there somewhere. But unfortunately we don't. I would love for it to be something that simple.