Update:
BT came, they did a line test, said all was fine.

They went back the exchange and some checks there.

Said they were getting 80m at the cab, and it drops to 72m by the time it gets to me.

I guess I really shouldn't complain, although still not gotten an explanation why the Line and Signal attenuation are so high on such a short link.

In reply to a post by mramcha:

Update:
BT came, they did a line test, said all was fine.

They went back the exchange and some checks there.

Said they were getting 80m at the cab, and it drops to 72m by the time it gets to me.

That makes sense, it's fibre to the cab so the cab should always get 80m.

I guess I really shouldn't complain, although still not gotten an explanation why the Line and Signal attenuation are so high on such a short link.

Are they high? What values should they be exactly?

That was the title of the post!

I was trying to find out what is "normal". If there is such a thing.

My stats are this:

6. Data rate: 19999 / 71621
7. Maximum data rate: 24055 / 70937
8. Noise margin: 15.2 / 6.3
9. Line attenuation: 22.1 / 17.2
10. Signal attenuation: 22.1 / 17.2

Compared to all other examples of Line attenuation and Signal attenuation I've seen posted by others in this and other forums for the HH5, people tend to have much lower values.

I have been connected since the 16th Jan and the line has appeared stable since, yet have noticed the SNR margins getting higher. The 1st two weeks it was roughly 15.5db UP and 11.5db - 12.7db Down.

From my understanding of ADSL+2, the lower the SNR the better sync rate and throughput. I was BE member for years and could alter my IP for fast path, etc, and having a 3db SNR was great but not stable but still enabled me to sync @ a 24mb line.

With FTTC, this appears to not be the case, as I'm having more noise but the sync is the same as day 1. Not complaining as its great and i'm way happy but would like some info to why this is? I'm I the only one on the cab?


Firmware version: v0.07.03.0814-BT (Type B) Last updated 22/1/2015
4. Board version: 01
5. VDSL uptime: 1 days, 15:10:14
6. Data Rate: 20000 / 79999
7. Maximum Data Rate: 36236 / 120267
8. Noise Margin: 16.6 / 17.3
9. Line Attenuation: 0.0 / 13.8
10. Signal Attenuation: 0.0 / 0.0

@ the OP, it's possible crosstalk could be impacting your line. Still a noob with FTTC myself

Edited by deleted (Thu 19-Feb-15 18:12:00)

The line attenuation is mainly a function of line length, but in VDSL2 land there are more than 1 band plan in use, each having it's own attenuation. So the figure you see is slightly more complex than in good old ADSL terms. If you want lower attenuation you'll have to move closer to the cabinet. My line length is about 200 metres and my attenuation is around 10.

My engineer said "Oooooh you are getting 80meg at the cab".

I was like, no shirt sherlock!

The SNR on VDSL still works the same as on ADSL.

But, you are at max sync. Unless noise increases significantly or BT introduce a new product above the current 80/20 then your sync will not change.

Many people would kill for such a short / good line.

Didn't know BT had gotten to the USA

Edited by lelboy (Fri 20-Feb-15 15:02:48)

In reply to a post by mramcha:

That was the title of the post!

I was trying to find out what is "normal". If there is such a thing.

My stats are this:

6. Data rate: 19999 / 71621
7. Maximum data rate: 24055 / 70937
8. Noise margin: 15.2 / 6.3
9. Line attenuation: 22.1 / 17.2
10. Signal attenuation: 22.1 / 17.2

Compared to all other examples of Line attenuation and Signal attenuation I've seen posted by others in this and other forums for the HH5, people tend to have much lower values.

I got connected on Tuesday and a stable connection ever since. I'm about 70m from the Fibre Cab.

My Stats

Upstream line rate (kbit/s): 19999
Downstream line rate (kbit/s): 79987
Maximum upstream rate (kbit/s): 36468
Maximum downstream rate (kbit/s): 123060
Upstream noise safety coefficient (dB): 23
Downstream noise safety coefficient (dB): 18.2
Upstream interleave depth: 0
Downstream interleave depth: 0
Line standard:
VDSL
Upstream line attenuation (dB): 4.5
Downstream line attenuation (dB): 3.3
Upstream output power (dBm): -11.8
Downstream output power (dBm): 13
Channel type: None
DSL up-time: 3 days 3 hours 35 minutes 55 seconds

Why are some peoples attenuation and signal attenuation 0.0?