Selected ISP Support > Covad / covad.net > Firmware rasied noise margins on 643

reply to Bill_MI

Re: Firmware rasied noise margins on 643

Sorry, I edited after excitement! I have lots of noise margin data (every hour since last April... no kidding!).

I'll be able to plot noise margin (downstream is the limiting factor) for a week before and a week after, I hope.
[text was edited by author 2003-04-07 20:41:45]

reply to gdm
See something is up with this new firmware:) it's just not in my head:)

I was wondering if a forced re-train may have done that with noise margins anyway. Well, what poo-pooh's that theory is that 13.5db is the highest I've ever seen this month - so it just may be real.

EDIT: I log noise margin every hour and 11.5db was the April high.
[text was edited by author 2003-04-07 20:50:39]

Now remember bill in my case safe mode the highest I could get was 10db down and averaged 8db or lower. When I upgraded the highest I got was 14db and goes down to 12db. Usually it's around 13db most of the time.

The question of the hour is if it equates to better noise performance (a.k.a less SYNC loss). For all we know something may have changed an arithmetic bug so the numbers change but performance doesn't. Remember... pessimists are NEVER disappointed.

EDIT: I'm inquiring in the ZyXEL forum.
[text was edited by author 2003-04-07 21:00:13]

One important thing you guys are overlooking. You see noise margins of 'x' and 'y' from your end. At the same time, what does Covad see on theirs ??
--
-= Mindspring MaxDSL via Covad 1536/384 TeleSurfer Pro =-

Hall, the 2 numbers always compared but it's been a while since I heard the DSLAM end. The DSLAM has a set of parameters but they compared so exactly I always figured they exchange each other's numbers. Only the modem can measure signal-to-noise ratio received, the DSLAM cannot, right?

EDIT: Or do you mean upstream? Upstream has never been an issue here - is it anywhere? Upstream is the low-freq end and (in our case) the narrower bandwidth. My upstream noise margin never gets below 18 (but I'll watch that, too).
[text was edited by author 2003-04-07 22:01:31]

reply to Hall
Well Monday night and I have been up the whole time. That is a first for a weeknight in about a month or so.

Not sure if the firmware had anything to do with it but it certainly didn't hurt.

My downstream noise margin is currently only 10.0 but maybe it went down lower every evening and that was why I couldn't hold sync?

By the way I am in Safe Mode and have been for a while so 928 is tops for me. Which is fine since my distance dictates that I am lucky to get that. Speed tests are giving me a 776/326 rating.

Hall,

My numbers always are in sync with what Covad sees. At least on the 643. Well Bill and ccarlin will be the test mine is another issue with night time at this point.

Let's see if ccarlin keeps sync the whole and week. Plus what Bill's monitor shows friday/saturday.

Ccarlin my noise margins go down at night and raise during the day by 1 db usually

Right now I am back in safe mode at 13/17.

Bill, I just checked and have
DSL F/W Version: Alcatel, Version 3.8.164
I can't say what it was before the firmware update. Also my firmware update shows 11/08/2002 where A3 I believe was 09/2002.
[text was edited by author 2003-04-08 00:55:10]

reply to gdm
I was in Safe Mode due to sync issues for about the last month using the 643 and TeleSoho 1500/384 service.
I just flashed my firmware to V2.50(AY.4) | 11/08/2002
and immediately saw an increase of about 4db in noise margins and a 5db decrease in relative capacity occupation downstream.
I called tech support and asked to be put in Fast Path.
My downstream noise margins in Fast Path since the firmware flash are about 3 to 3.5 db higher than they were when when I was having sync issues. Hopefully it will remain stable.

Downstream Noise Margin
relative capacity occupation: 82%
noise margin downstream: 9.5 db
output power upstream: 12.0 dbm
attenuation downstream: 64.0 db

Very interesting. Szanke so far all of ours have remained stable. It may decrease 1-2 db but it usually goes up to.

Form me in safe mode 14/18 are my peaks. I average about 12.5-13/17.

reply to szanke
9.5 is still borderline, isn't it ??

reply to gdm

Hall I want to smack you:) I was running fine at 7.5/13 in fast path with no issues from 6am to 7pm. After that something is going on.

From all my reading as long as you can stay above 6db you are good.

Where/how did you get that screen shot?
[text was edited by author 2003-04-08 22:51:40]

Data Update

Do it Bill!!!! Come on you know you want to:):)

reply to gdm

Re: Firmware rasied noise margins on 643

said by gdm:

---

Bill, I just checked and have
DSL F/W Version: Alcatel, Version 3.8.164
I can't say what it was before the firmware update.

---

I haven't found anything on it either.