Analyse my Line Stats Please:

n30_mkii

n30_mkii

n30_mkii

Associate
Joined
31 May 2005
Posts
2,180
Location
Alfreton,Derbyshire
I have just been into the new house, and have plugged my router in straight away in the hope the old adsl service might be active;

To my luck it was, obviously I can't login to the current ISP but thought I would share my stats.

This is a line with a BT max of 256k on there checker. These however are the current stats

Uptime: 0 days, 0:02:58
DSL Type: G.992.3 annex A
Bandwidth (Up/Down) [kbps/kbps]: 422 / 1.663
Data Transferred (Sent/Received) [kB/kB]: 7,00 / 17,00
Output Power (Up/Down) [dBm]: 12,5 / 0,0
Line Attenuation (Up/Down) [dB]: 39,5 / 68,5
SN Margin (Up/Down) [dB]: 6,0 / 5,5
Vendor ID (Local/Remote): TMMB / IFTN
Loss of Framing (Local/Remote): 0 / 0
Loss of Signal (Local/Remote): 0 / 0
Loss of Power (Local/Remote): 0 / 0
Loss of Link (Remote): 0
Error Seconds (Local/Remote): 0 / 0
FEC Errors (Up/Down): 0 / 301
CRC Errors (Up/Down): 0 / 25
HEC Errors (Up/Down): 0 / 19

It looks to me like a connection of 1.6 MB download? But how do the other stats hold up? SNR seems low and attenuation pretty high, will the connection be stable at those rates? Or will it be flakey? Any room for improvement?

The router was plugged directly into the master socket, which already had an NT5e type faceplate so ADSL/Phone with two sockets.

Any advice appreciated, basically I can either go with ADSL depending what the stats mean above, or there is an option of a guaranteed 1MB wireless connection in the area.

Thoughts please?
 
The high attenuation indicates you have a very long line, so as long as the SNR (down) stays around 6db your line should remain stable at the current speed.

During the evening hours the SNR could dip due to all the street lighting, but so long as it remains between 3 & 6db, your line should remain stable.
 
I'm guessing that is the sync speed that has been on the line for a while? i.e through the training period for the previous owners. That was read after 6pm last night.

Looks a little more promising than the expected 256k, for the couple of mins it was connected seems like there was a good few errors? Is that anything to worry about? Is there any other way these stats could be improved at all? I know it's a long way from the exchange so I don'tmind if this is the peak performance. I have a thompson 585 so can tweak the margins etc, but they already look pretty tight
 
Line's pretty long, but that in itself shouldn't really affect stability. Think that's probably about the limit, speed-wise - could ask for a 3dB SNR profile, but a line of that length probably has enough day-to-day variation to require the 6dB margin to be stable.
 
Thanks for your comments folks, I'll be happy if I can get a 1.6MB connection. Not great but better than 256k :D
 
Summary
Please post your stats with at least 6 hours uptime for the best results.
If your line is too unstable to gain 6 hours then here is an interpretation of the submitted stats:
Average down sync speed is 78% of the estimated maximum.
Only connecting on ADSL2 not ADSL2+.
SNR is good.
The attenuation values are out.
The power values are out.
There are some FEC errors.
There are CRC errors.
There are HEC errors.
It looks like you are using a SpeedTouch780 to connect to (Unknown)'s network via Manchester (GB).
Overall your line looks poor. Line has a score of: 5
A lower score is better.
* Upstream errors are not reset when your modem syncs or is rebooted as these are kept on the DSLAM in the exchange. These errors are not counted in your connection score as it is imposable to tell if they have been cleared. Here are some instructions to clear the upstream error count if you want to have an idea on the upstream error rate.

Down Sync
You are synced at 1,663 kbps. This sync will have a max throughput of about 0.17 MiB/s or 1,380 kbps.

Your expected max sync depends on many things, mostly the quality of the line and the target Signal to Noise margin at the time of sync.
Expected max syncs are:
3db Fastpath: 3,506
6db Fastpath or 3db Interleaved: 2,583
6db Interleaved: 2,143

You appear to be on the standard Signal to Noise margin and with Interleaved set.
Your sync is 78% of the estimated maximum for a line with Interleaved and standard SNR at your line length (4,960 meters).
Your sync is a little lower than expected, but within the normal range.

Modulation
You are on ADSL2. If you have not requested ADSL2 then this indicates that there is probably noise on the line or you have an internal wiring issue that you need to get sorted.
You are on the standard upload rate.
- You would gain next to nothing with annex M (an enhanced upload rate), and would lose download speed.

Signal-to-Noise
Your SN margins look to be within normal range.

Attenuation
The attenuation values of your line indicate that there is an issue somewhere.
The Attenuation values are normaly ~2:1 (downstream:upstream). Your values were 69 down and 40 up. That is 1.73.
This is usually a hardware problem rather than a line issue, and the main culprit is the adsl filter, or your internal wiring.

Output Power
The output power for either the DSLAM or your modem indicate that there is an issue somewhere.
This is usually a hardware problem rather than a line issue. Ignore this if you are synced close to the max sync rates as less power is needed if you are close to the exchange.

Errors
There have been 301 FEC errors in the last 0h 02m 58s
These FEC errors are corrected errors on the downstream and are not necessarily something to worry about.
0.59 seconds per corrected error. Keep an eye on these errors as it they are getting close to problematic.
6,088 corrected errors per hour

There have been 25 CRC errors in the last 0h 02m 58s on the downstream.
Oh dear there are lots of CRC errors...
506 CRC errors per hour

There have been 19 HEC errors in the last 0h 02m 58s on the downstream.
Oh dear there are lots of HEC errors...
384 HEC errors per hour
 
Last edited:
You must log in or register to reply here.
Back
Top Bottom