ADSL stats query

Hi forum folk,

I'm hoping someone can provide me with basic ADSL assistance. I'm with Plusnet using the supplied TG582n router, and have the updated 10.2.2.B firmware. Unfortunately I live about 3.5KM from my exchange and have 'broadband' of about 1Mb. My stats are below:

DSL Type:ITU-T G.992.1
Bandwidth (Up/Down) [kbps/kbps]:448 / 1,024
Data Transferred (Sent/Received) [MB/MB]:7.11 / 113.58
Output Power (Up/Down) [dBm]:12.4 / 16.0
Line Attenuation (Up/Down) [dB]:31.5 / 63.5
SN Margin (Up/Down) [dB]:11.0 / 7.9
System Vendor ID (Local/Remote):TMMB / ----
Chipset Vendor ID (Local/Remote):BDCM / TSTC
Loss of Framing (Local/Remote):0 / -
Loss of Signal (Local/Remote):0 / -
Loss of Power (Local/Remote):0 / -
Loss of Link (Remote):-
Error Seconds (Local/Remote):2 / -
FEC Errors (Up/Down):0 / 23,660
CRC Errors (Up/Down):0 / 2
HEC Errors (Up/Down):- / 1

I am happy with the TG582n for now as research suggests its Broadcom chipset is good for long/noisy lines like mine. I may try a Billion 7800N in the near future to alter target SNR, but don't want to get ahead of myself. My line is generally stable. I borrowed an Asus N66U and it synced at a much lower rate (though wireless LAN connectivity was great and the GUI was smashing).

I believe my stats tell me that I have a very noisy line (possibly higher than the reported 63.5dB downstream which I read is the max reported value). I currently have the modem plugged directly into the test socket of my master socket.

My questions...
- Do my stats tell me anything other than I'm unlucky with my line?
- Is there something I should try for basic problem identification?

Thanks in advance,
Dave

A lot further than 3.5km, the attenuations suggest 6km or more.

Nothing obvious in those stats ...

If you want to invest £5 or £10 look for a 2wire 2700HGV hub on ebay - make sure it is a 2700 and not a 2701, and if you are not on a BT service a minor tweak is needed. They too are excellent on most long lines and if the line is stable will sync with a 3dB SNR. They will then hold sync even as the SNR drops to zero and even when just negative.

I put one on a friends line, which was running at under 400kbps, sometime as low as 250kbps, and it moved the sync up to around 800 kbps.

Hi both,

Thanks for the info. Samknows suggests I am only 3.5km away from my exchange, and that feels about right based on my knowledge.

Having a quick look on ebay and the web, it seems tricky to be sure that whether a 2wire 2700HGV is a 2700 or 2701 - most of them appear in reality to be the newer 2701. I will continue to investigate and hopefully find a 2700 and report back. I presume the plan would be to run it in bridge mode with a router once I have the best line speed possible.

Thanks again,
Dave

In reply to a post by DGR1:

Samknows suggests I am only 3.5km away from my exchange

Sam only knows the straight line distance not the line length which is what matters.

You definitely need teh 2700, the tweak to get it to run on a non-BT line works with 2700s but not sure about 2701.

There is actually a reasonable router in the 2700 - I used one for several years and now use a 2701 with an FTTC modem.

http://bt2700hgv.tripod.com/ir1002700HGV.htm has a wealth of information and details on "unlocking".

Have a look at: http://tinyurl.com/q5l2bfq it shows how te noise margin varies during a day and dropped as low as 0.5dB

and from te diagnostics: http://tinyurl.com/pgvwghy showing it syced at 3.0dB and at that specific moment in time SNR was 0.5dB. Somewhere I have a screen shot showing -0.7dB.

A point to make is how different router report noise margin.

For example a DG834gv3 router I had would sync with a 6db noise margin and often, in fact every night report a noise margin as low as 1db.

Using a speedtouch router on the same line. I would sync with a 6db noise margin, virtually the same sync but this router would never show a noise margin below 5db.

Different routers measuring things differently. I doubt it was a case of the 'noise' was just coincidentally better everytime I used the speedtouch.

So it may just be that this router does report things a little more 'wildly.' That said it definitely does max out a lines sync speed like you say.

Whereas I had Speedtouch 585s that lost connection from a 6dB margin when it fell below 3dB, but Netgears with similar Broadcom chipsets sync'ed 500kbps higher and held sync easily, so I was able to tweak to 4dB and go even faster.

The Netgears also reported ~2.5dB lower attenuation.

Edited by RobertoS (Sat 06-Sep-14 01:53:10)

Thanks again for all the info. The content at http://bt2700hgv.tripod.com/ir1002700HGV.htm suggests that many 2wires branded as 2700s are in fact later 2701 models, and all the ones on ebay at the moment appear to be 2701s.

I presume it is one of the early models I need?

Dave

The only reason I said 2700 was that there are hardware differences between the 2700 and 2701 and I cannot be sure that the modem front end is still the same. All my long line experience was with the 2700.

So, try to get a 2700 - it will NOT have a WAN port.