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chrisjackson1985
17-10-2009, 04:16
Are my power levels fine, and is there anymore of the information available that would be useful to someone who has a clue what they all mean? :)

Downstream
Power Level
(dBmV) -5.65-5.37-6.07 N/A

Upstream
Power Level
(dBmV) 58.21 N/A N/A N/A

DOCSIS Mode : DOCSIS 3.0

Downstream Service Flow:

SFID : 7700
Max Traffic Rate : 53000000 bps
Max Traffic Burst : 3044 bytes
Min Traffic Rate : 0 bps

Upstream Service Flow:

SFID : 7699
Max Traffic Rate : 1750000 bps
Max Traffic Burst : 3044 bytes
Min Traffic Rate : 0 bps
Max Concatenated Burst : 1522 bytes
Scheduling Type : Best Effort
Peter_
17-10-2009, 06:28
Upstream to high call the 50Mb Support line after 0800 on 0800 052 0431
chrisjackson1985
17-10-2009, 13:20
cheers bud, what should it be at?

i phoned em and got an ENGLISH person... cant believe it.

they wonderered how i knew, so just told em an employee told me it was too high. lol

they agreed it was too high, and that a supervisor will come around next wednesday between 12-4 to do whatever they do.

should it be similar to my downstream one? ... -5.65?

if so, its wayyyy out.

also, what does a high upstream power level actually do to the connection?

sorry for all the questions :)
Peter_
17-10-2009, 20:45
Upstream ideally in the mid 40's

It can cause loss of connection and slow speeds..
AbyssUnderground
17-10-2009, 21:27
Downstream should be as near to 0 as possible. +/- 5dBmV is the tolerance level.
SNR should be above 30dB. Any lower will cause issues.
Upstream should be between 40-50dBmV.
chrisjackson1985
21-10-2009, 22:08
well, the engineer came.

hes bumped up my downstream power level from -5 to 8.79

and lowered my upstream from 58.21 to 46.50

he said its fine now.
Peter_
21-10-2009, 22:17
well, the engineer came.

hes bumped up my downstream power level from -5 to 8.79

and lowered my upstream from 58.21 to 46.50

he said its fine now.
If all your Downstreams are around 8/9 you may well have more issues as that is now to high for 50Mb, keep an eye on it and if you have any more issues call the 50Mb Support line on 0800 052 0431.
AbyssUnderground
21-10-2009, 22:51
Why do some engineers not know the basic information like proper signal levels? Makes me wonder sometimes... :rolleyes:
broadbandking
21-10-2009, 23:16
Can't the 50Mb modem handle higher power levels?
AbyssUnderground
21-10-2009, 23:21
I believe the 50Mbps modem is even fussier about signal levels than the lower tier modems...
Peter_
22-10-2009, 06:25
I believe the 50Mbps modem is even fussier about signal levels than the lower tier modems...
Oh yes quite an accurate observation.
AbyssUnderground
22-10-2009, 12:59
Oh yes quite an accurate observation.

In response to rep, perhaps I should work for Virgin?! I seem to know more than some of the engineers out there... :erm:
Luke19kor
22-10-2009, 14:11
Hiya, just wondering if you might be able to offer me a little advice please.

i'm on 10mb broadband with virgin media and at first it was great with good speeds, however recently (last couple of months) it's gotten progresively slower until now it can take minutes just to load simple webpages.

after reading this forum i was hoping you might cast your eyes over my modem stats as i think some of what's been said here might apply to me.

Downstream Lock : Locked
Downstream Frequency : 330750000 Hz
Downstream Modulation : QAM256
Downstream Interleave Depth : 32
Downstream Receive Power Level : 7.8 dBmV
Downstream SNR : 27.4 dB

Upstream Channel ID : 1
Upstream Transmit Power Level : 49.0 dBmV
Upstream Symbol Rate : 2560 Ksym/sec
Upstream Frequency : 25800000 Hz
Upstream Mini-Slot Size : 2


i have spoken to tech support once and they basically said the problem was mine even though i've bought all new cables and tested two different computers (one brand new and top spec) as well as a laptop, and have tested with and without my wireless router.

i've also done ping tests through cmd prompt and don't appear to be getting any packet loss.

thanks for any help, hopefully i can phone em back with a little more ammo, Luke.
moaningmags
22-10-2009, 14:20
Your downstream SNR: 27.4 is too low.
AbyssUnderground
22-10-2009, 14:21
Downstream Receive Power Level : 7.8 dBmV
Downstream SNR : 27.4 dB


Downstream is too high, it should be +/- 5dBmV
SNR is very borderline, it should be over 30dB

You need to call customer support and get a tech arranged. It won't cost you anything as the service is at fault.
webcrawler2050
22-10-2009, 14:22
Your downstream SNR: 27.4 is too low.

What she said :D
Luke19kor
22-10-2009, 15:12
Thanks for that, I suspected as much after reading the above posts but always nice to have a second opinion, have a nice day, Luke.