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[roseway]

A couple of days ago a message was posted on TBB saying that the poster had been stuck with a 15 dB target noise margin, but after he installed a Billion Bipac 5200g router his target noise margin immediately fell to 6 dB and his connection speed rose by about 2 Mbps. This seemed most unlikely, probably just coincidence, and I suggested this to him.

However I had the opportunity to try out one of these routers on my connection, which has also been stuck at 15 dB. Rather to my amazement, it immediately came up with a noise margin of 6 dB and a higher connection speed than I've ever had before (7360 kbps). I'm still a bit gobsmacked, but it does look as though this router has the capability to force the target noise margin back to its default.

[mr_chris]

Ooooo...... interesting!

What happens if you then put another router back on the line? Is the target SNR still back at default?

If so, it might be worth investing in one of these routers - you could 'hire it out' to people who want to reset their noise margins

[roseway]

I don't know if I'm willing at present to swap the router back, when I'm getting such an improved connection.

[emgee]

Fascinating. I'm also stuck at 15db at the moment and I don't trust the DLM to lower it anytime soon.
What is the chipset in that router?

[roseway]

It's a TrendChip 3162 chipset, the same as is used on a number of other Billion routers. Not a chipset I'm familiar with at all.

[Floydoid]

After a quick google on the matter, I've seen a few comments about lower noise margin and improved speeds.

One for Kitz to get her teeth into methinks.

[b4dger]

I've been following that TBB thread...

Can you post your line stats to give us some more to think about?
If you are syncing at 7360 I'm guessing your line is quite short/good.

Also how is your SNRM looking over night?

All interesting stuff.

[roseway]

Here are my current stats:

       Downstream     Upstream    
      
SNR Margin:   5.0    22.0    dB
      
Line Attenuation: 45.0    24.5    dB
      
Data Rate:   7360    448    kbps


As you can see, it's not a particularly short line. The indicated downstream attenuation is higher than reported by other routers - they all report 41 - 42 dB

[emgee]

Wow. That's a good speed for that  line length. How much variation in the noise margin are you seeing?

[roseway]

I only installed it 8 hours ago, so I don't know the answer to that question. Tomorrow morning I'll have a better idea.

[roseway]

As I expected, the router reconnected at a lower speed during the night, but still with the 6 dB noise margin. It's now at the level I had before my line had the temporary fault a few weeks ago. So my IP profile should be back where it was very soon. It's definitely looking like a result.

I've been poking around in the CLI to see what I can find. It has a command which appears to set the target noise margin directly, and at the moment it's set to zero which is presumably the default. At the moment I haven't got a manual for the CLI, so I'm not going to change anything now, but when I've traced a manual I might have a play.

[mr_chris]

Definitely one to keep an eye on! I'd really love to know if it's permanently fixed it or whether it's just that router that somehow manages to temporarily override the DSLAM. Not expecting or asking you to try it Eric of course, given the delicate nature of IP profiles and sync speeds, but can't help wondering

[roseway]

I'm an inveterate fiddler as you know, so I'll probably be having another go at breaking things quite soon.

My IP profile is now back where it belongs, less than 24 hours after installing the new router.

[kitz]

hmmm  very interesting - like you I would have thought co-incidence at first, but from what you say it would appear to be over-riding the default.

I wonder if there is something somewhere which specifically allows this router to do this...  and if so where...  it could make it a bit of a winner for some.   That does seem a pretty good sync for your line.

Hows it holding out with errors count?

[roseway]

Fairly modest error counts after nearly two days of uptime:

router> wan adsl perfdata
near-end FEC error fast: 0
near-end FEC error interleaved: 9789
near-end CRC error fast: 0
near-end CRC error interleaved: 1002
near-end HEC error fast: 0
near-end HEC error interleaved: 11585
far-end FEC error fast: 0
far-end FEC error interleaved: 21
far-end CRC error fast: 0
far-end CRC error interleaved: 1
far-end HEC error fast: 0
far-end HEC error interleaved: 1
Error second in 15min           : 4
Error second in 24hr            : 55
Error second after power-up     : 655
ADSL uptime    43:40:27