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New Visitor
HapGail
Posts: 9
Registered: ‎02-05-2012

Downstream level changed

I notice today my Downstream Power Level has changed from +8dB to now -2dB and SNR is 38dB, that is a big difference, so I might have a problem since we had falling trees during the last snow storm up here in Cascade MD, should I put in a troubleshooting ticket.

Recognized Contributor
sabretooth
Posts: 351
Registered: ‎12-15-2011

Re: Downstream level changed

Are you having any problems?

New Visitor
HapGail
Posts: 9
Registered: ‎02-05-2012

Re: Downstream level changed

not really sure yet the download speed is about 20m, upload about 4m

Recognized Contributor
sabretooth
Posts: 351
Registered: ‎12-15-2011

Re: Downstream level changed

Then don't worry about it.

New Visitor
HapGail
Posts: 9
Registered: ‎02-05-2012

Re: Downstream level changed

[ Edited ]

not the answer I was looking for, since the dB level has changed- alot- yes there is a problem, also the on demand could have issues

Recognized Contributor
sabretooth
Posts: 351
Registered: ‎12-15-2011

Re: Downstream level changed

-10 dBmV to +10 dBmV is the spec for downstream power levels.  Are you out of spec?

New Visitor
HapGail
Posts: 9
Registered: ‎02-05-2012

Re: Downstream level changed

the point is, when the repair Tech came out to do the setup he used all my equipment and not his because mine was better then what comcast offered and he was very happy with the results, less cable loss, better splitters, soild connectors not cables, splitting the Modem/on-demand off from the other TV ports, and he liked the download pwr level which was +8dB/SNA 38dB which was the best he seen in a while.

Connection Expert
EG
Posts: 42,184
Registered: ‎12-24-2003

Re: Downstream level changed

[ Edited ]

The signal stats should never fluctuate more than 2-3 dB Even though your downstream power has actually gotten better. What does the upstream power level figure look like ? Keep an eye on your stats for a while and see if they remain relatvely stable. If not. and you experience issues even with your T.V. reception, you should call it back in for a tech to investigate further.

Connection Expert
EG
Posts: 42,184
Registered: ‎12-24-2003

Re: Downstream level changed


sabretooth wrote:

-10 dBmV to +10 dBmV is the spec for downstream power levels.


It's actually even tighter now-a-days in upgraded to DOCSIS 3 systems. -7 dB to +7 dB is the preferred range with - 10 dB to +10 dB being the very outer limits.

Recognized Contributor
sabretooth
Posts: 351
Registered: ‎12-15-2011

Re: Downstream level changed

^^ Thank you.  I was going by this document I found on this forum.

 

http://www.dslreports.com/faq/16085 

Connection Expert
EG
Posts: 42,184
Registered: ‎12-24-2003

Re: Downstream level changed

That hasn't been updated in a while... Neither have the sticky troubleshooting topics here in this forum.

Recognized Contributor
sabretooth
Posts: 351
Registered: ‎12-15-2011

Re: Downstream level changed


EG wrote:

That hasn't been updated in a while... Neither have the sticky troubleshooting topics here in this forum.



So.... what are you doing right now???  :smileywink:

New Visitor
HapGail
Posts: 9
Registered: ‎02-05-2012

Re: Downstream level changed

[ Edited ]

Upstream is +49dB.

and most likely why the Tech liked my setup because the on-demand box.

The Wife states the On-demand picture is not always good , it has rips during playback.

Connection Expert
EG
Posts: 42,184
Registered: ‎12-24-2003

Re: Downstream level changed

That is at the upper limit of being in spec (should be below 50 db) but it doesn't leave much wiggle room for fluctuations. 40 to 45 dB would be better.

New Visitor
HapGail
Posts: 9
Registered: ‎02-05-2012

Re: Downstream level changed

[ Edited ]

The Tech liked it??

and it's been like that for a long time>2yrs

Connection Expert
EG
Posts: 42,184
Registered: ‎12-24-2003

Re: Downstream level changed

Alrighty then. Suit yourself. I hope things hold out for you..

New Visitor
HapGail
Posts: 9
Registered: ‎02-05-2012

Re: Downstream level changed

[ Edited ]

suit myself..LOL, my guess is your an RF Tech then

Connection Expert
EG
Posts: 42,184
Registered: ‎12-24-2003

Re: Downstream level changed

"You can lead a horse to water, but you can't make him drink".... :smileysad: 

New Visitor
HapGail
Posts: 9
Registered: ‎02-05-2012

Re: Downstream level changed

LoL, so true