Re: Yes, my noise margin is 3... what's it to you? in AT&T Midwest

Re: Yes, my noise margin is 3... what's it to you?

Mon, 13 Oct 2008 11:14:58 EDT

d_l : There are still differences in the AFE circuitry between modems and also probably in the programming/operation of the AR7 chip set (the DSP datapump firmware).

Re: Yes, my noise margin is 3... what's it to you?

Mon, 13 Oct 2008 10:35:35 EDT

lev : It's the new, low-latency interleave.

Pings to www.dslreports.com are either 44 or 45 ms.

It's a Netopia 3347, which uses the same chipset as the Motorola 2210.

Re: Yes, my noise margin is 3... what's it to you?

Mon, 13 Oct 2008 10:29:04 EDT

Dennis :

said by d_l :

Have you ever experimented with different modems on the line ...

Are you kidding? If I was him I wouldn't even look a the modem for fear of causing a loss of sync. :D
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Re: Yes, my noise margin is 3... what's it to you?

Mon, 13 Oct 2008 10:01:09 EDT

d_l : Is that interleave mode the old high latency, high depth (16?) version or the new low latency, low depth (4) interleave?

Have you ever experimented with different modems on the line such as the AR-7 Speedstreams, a 2210, or 2Wires to see if their AFEs, chip sets, and firmware might give better results?

Now my noise margin is 2

Mon, 13 Oct 2008 09:21:44 EDT

lev : I'd really, really like to have better bang for the buck than this.

Still, I'm wondering how low it will go and still function. No DSL reset for the past two days.

----

ADSL Line State: Up
ADSL Startup Attempts: 4
ADSL Modulation: DMT
ADSL Data Path: Interleave
Datapump Version: DSP 5.2.2.0, HAL 5.2.2.0
Downstream Upstream
---------- ----------
SNR Margin: 2.00 13.00 dB
Line Attenuation: 63.50 31.50 dB
Output Power: 16.79 11.64 dB
Errored Seconds: 0 0
Loss of Signal: 0 0
Loss of Frame: 0 0
CRC Errors: 8374 7
Data Rate: 1984 512

Re: Yes, my noise margin is 3... what's it to you?

Fri, 25 Apr 2008 13:41:27 EDT

nwrickert :

said by public :

It does not make sense to have 50dB atten with 16dB snr and only 9dBm Tx power.

That's going to depend on the modem. I should have mentioned that those figures are with a Westell 327w, and 1536 downstream speed. I would expect a higher transmit power with a higher speed.
--
AT&T dsl; Westell 327w modem/router; SuSE 10.1; firefox 2.0.0.13

Re: Yes, my noise margin is 3... what's it to you?

Fri, 25 Apr 2008 13:05:42 EDT

public :

said by lev :

The chipset in this modem is, I believe, the same chipset in the Motorola 2210. My older modems couldn't sync nearly as high on this crappy line.

The problem is the line or noise environment may degrade over time.

Re: Yes, my noise margin is 3... what's it to you?

Fri, 25 Apr 2008 13:02:40 EDT

public :

said by nwrickert :

[Margin (dB) 15.5 16.0
Line Attenuation (dB) 50.5 31.5
Transmit Power (dBm) 8.7 4.7

We are using different modems, so the statistics are not completely comparable. With a 5100b I get a higher attenuation (54 or 55 I think).

It does not make sense to have 50dB atten with 16dB snr and only 9dBm Tx power.
Reducing the dmt spectrum to a single number does not give good results.

Re: Yes, my noise margin is 3... what's it to you?

Fri, 25 Apr 2008 09:14:04 EDT

d_l : I don't know the official numbers, but from what I've seen, interleave mode for DSL is worth about 3.0 dB extra noise margin, more or less. Sometimes the extra interleave latency is a small price to pay for the additional noise margin. :)

Re: Yes, my noise margin is 3... what's it to you?

Thu, 24 Apr 2008 23:31:22 EDT

gdm : To me the interleave seems to be 10-15 for me with u-verse.

Rumors on utalk or uverseusers that someone was getting charged for a static IP on U-verse. Waiting on the guy to post his bill but nothing yet.

Re: Yes, my noise margin is 3... what's it to you?

Thu, 24 Apr 2008 23:26:07 EDT

Floydo : Yup, mine hangs on pretty good at 3 to 5dB with a 4100 and the Elite pkg.

Line State UP
Modulation DMT
Data Path fast

To Modem To Internet
Max Allowed Speed (kbps) 4704 768
SN Margin (dB) 3.0 -
Line Attenuation (dB) 58.0 -

Re: Yes, my noise margin is 3... what's it to you?

Thu, 24 Apr 2008 23:20:49 EDT

VegasMan : That's funny my SN has been around 6.5-7 all week and I haven't lost connection other than when I reset the modem trying to get a better ratio. My attenuation has been steady at 45.
I still putter along at 5.1/520 on my speed test and have low errors using a 4100.
--
In need of a Vegas vacation.

Re: Yes, my noise margin is 3... what's it to you?

Thu, 24 Apr 2008 23:17:07 EDT

lev : I did, but I found that interleave only took my latency up 10ms.

I'd take UVerse at this point, but only with static IPs, which they're still not offering.

Re: Yes, my noise margin is 3... what's it to you?

Thu, 24 Apr 2008 23:08:25 EDT

gdm : Didn't some one tell me they would rather have dsl then interleave U-verse???

Hmmm here's my stats on interleave :).

DSL Down Up
Current Rate: 25216 kbs 2048 kbs
Max Rate: 62076 kbs Not Available
Current Connection:
Current Noise Margin: 26.0 dB Not Available
Current Attenuation: 22.4 dB Not Available
Current Output Power: 13.7 dBm -12.2 dBm

Re: Yes, my noise margin is 3... what's it to you?

Thu, 24 Apr 2008 22:04:59 EDT

lev :

said by nwrickert :

... what's it to you?

That makes me wonder whether I should try to get bumped up to a higher speed.

You probably could, even on Fastpath.

The key line in what I posted that allowed that is:

ADSL Data Path: Interleave

Otherwise, it'd be dead as a doornail.

The chipset in this modem is, I believe, the same chipset in the Motorola 2210. My older modems couldn't sync nearly as high on this crappy line.

Re: Yes, my noise margin is 3... what's it to you?

Thu, 24 Apr 2008 21:07:49 EDT

Dennis : I honestly thought nothing below 5 would ever hold...with a noise margin that small you might want to look at buying a Hummer.

Re: Yes, my noise margin is 3... what's it to you?

Thu, 24 Apr 2008 20:42:05 EDT

wayjac : I'm guessing its a netopia modem that's hanging on to that signal like there's no tomorrow

Re: Yes, my noise margin is 3... what's it to you?

Thu, 24 Apr 2008 20:42:03 EDT

nwrickert :

... what's it to you?

That makes me wonder whether I should try to get bumped up to a higher speed.


Data Path:               Fast
Transceiver Information
DSL Speed (Kbits/Sec)  	1536  	384
Margin (dB) 	15.5 	16.0
Line Attenuation (dB) 	50.5 	31.5
Transmit Power (dBm) 	8.7 	4.7

We are using different modems, so the statistics are not completely comparable. With a 5100b I get a higher attenuation (54 or 55 I think).

What holds me back from asking, is that the 1536 is adequate for most of what I do, and reliable is more important than fast.

--
AT&T dsl; Westell 327w modem/router; SuSE 10.1; firefox 2.0.0.13

Yes, my noise margin is 3... what's it to you?

Thu, 24 Apr 2008 20:22:48 EDT

lev : ADSL Line State: Up
ADSL Startup Attempts: 50
ADSL Modulation: DMT
ADSL Data Path: Interleave
Datapump Version: DSP 5.2.2.0, HAL 5.2.2.0
Downstream Upstream
---------- ----------
SNR Margin: 3.00 14.00 dB
Line Attenuation: 63.50 31.50 dB
Output Power: 17.16 11.83 dB
Errored Seconds: 0 0
Loss of Signal: 0 0
Loss of Frame: 0 0
CRC Errors: 511 6
Data Rate: 2496 512

----

So my connection resets every few hours. At least I have broadband.

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started to keep discussion away from this post in another thread.