Understanding My Tone Graph

Hi there,

I am just doing some learning as my broadband has degraded from 13Mb to 8Mb.....I have tried to get the SNR margins lowered which never last long before DLM put them back up.....I was wondering if this Tone graph holds any clues but am not sure what I should be looking for....

Any opinions if it looks ok or not ?

[img=http://s18.postimg.org/3pim8gy05/graph.jpg]

[img=http://s11.postimg.org/j0sby96db/graph2.jpg]

Edited by deleted (Wed 14-Oct-15 21:15:41)

The first looks sort of normal, the SNRM graph in the second is completely crazy.

Was anything electrical or electronic in the house switched on between the two? Possibly something on, and something else off.

The question includes anything, such as fluorescent or LED lights, vacuum cleaners, particular TVs, Sky boxes, similar in children's rooms, electrical exercise equipment. Anything at all electrical. This may even include next door wrt terraced or semi-detached houses, though answering the question wrt them may not be simple.

Is this a regular occurrence at this time, or is it random?

They were taken at the same time.....the first shows SNR and the second pic shows SNRM.

I wasnt sure which would be more beneficial for fault finding so posted pics of both

Edit to add more detail:

I always use the master socket, Tried 2 routers/adsl filters.......If I listen carefully on a quiet line test I can hear a very faint noise blipping quite frequently (but at random intervals)....... the noise doesnt sound like a 'blip', but I'm not sure how else to describe it.

It is very faint so unsure if this is worthwhile reporting ?

Edited by deleted (Wed 14-Oct-15 22:31:37)

Oops. I'm so used to everyone calling SNRM SNR, including many routers and software, that I didn't spot that.

It's probably your error counts that we need to see.

Edited by RobertoS (Wed 14-Oct-15 22:24:52)

Ive had this CRC log running since 9pm today if it helps:.....the count resets every 15mins as the graph shows....

http://s15.postimg.org/f6e9acezf/crc.jpg

Total Uptimes (From SF counts):
WAN: 0 days, 07:18:59
LAN: 0 days, 00:00:00


Noise Margin: 9.6 dB
Connection Rate: 8279 Kbps
Line Attenuation: 34.0 dB
Power: 0.0 dBm
Max Rate: 10776 Kbps

SuperFrames: 1627864
SF (CRC) Errors: 4762
Reed Solomon: 211622410
RS Corrected: 122195310
RS Un-Corrected: 5679
HEC: 2950
Errored Seconds: 2746
Severe ES: 0

Interleave Depth: 64
Bitswaps: 75

I always use the master socket,

Is there any extension wiring connected to the master socket front plate, and if so, what do those stats look like with the front plate removed and the router in the test socket ?

I tried the test socket but it made no difference.....then again, there were no other wires attached to the pins on the back of the plate either.

Are there any extension that a phone works in?

In reply to a post by RobertoS:

Are there any extension that a phone works in?

There is only the master socket in the house if that's what you mean, filtered to the router and phone.

Over half your packets are needing correction. Over 122 million in under 8 hours. That's about 4,600 per second. Your router is doing little but error correction.

What do speed test results give?

Summat is oop!

Speed test shows 7.3 download speed, .7 up

Odder still.

I wonder - at the start of the 8 hours, did you do a re-sync of the router, or a power cycle. In other words, might those counts be for longer than 8 hours?

Even if they are, over half the packets being errored is horrendous.

Stops - thinks.
...
This isn't making sense. You have these millions of errors in 8 hours, 2746 error seconds (46 minutes) but no Severe ES. I suspect the figures.

What router is it, and how long have you had it? Have you another? If so, did you get the current one because of the loss of speed?

Probably unimportant - which ISP and package is it please?

pretty sure all stats are over the course of the 8hours or so.

I have 2 routers., I used the BT homehub up until I wanted to try figure out what was going on with the line......the homehub gives no details...

So, I plugged my second router in, it is a Netgear DGN2200 with ModFS installed.....never had issues with the router before but can't rule out that MODFS reporting might be dodgy?

updated stats:

SuperFrames: 2064766
SF (CRC) Errors: 5300
Reed Solomon: 268419662
RS Corrected: 163275291
RS Un-Corrected: 6326
HEC: 3266
Errored Seconds: 3250
Severe ES: 0

The CRC errors have calmed down to about 200 an hour for now....seemed to be a big spike of them at the time I posted the CRC graph earlier.

the stats on the routers interface show:

FEC: 163098527
CRC: 5300
ES: 3250
SES: 0
UAS: 38
LOS: 0
LOF: 0

If I had my way I would reintroduce flogging for calling SNRM SNR...

About 10 years ago, I gave up trying to educate people about the difference. The manufacturers, who should know better, are just as bad.