power levels are these correct eeek

[herc]

Downstream Status
Operational

Channel ID
1

Downstream Frequency
331000000 Hz

Modulation
256QAM

Bit Rate
10240000 bits/sec

Power Level
-1.3 dBmV

Signal to Noise Ratio
41.5 dB
Upstream Status
Operational

Channel ID
4

Upstream Frequency
29200000 Hz

Modulation
QPSK

Bit Rate
384000 bits/sec

Power Level
37.0 dBmV

[papa smurf]

:tu:

[matuneek]

Downstream Lock : LockedDownstream Frequency : 402750000 HzDownstream Modulation : QAM256Downstream Interleave Depth : 32Downstream Receive Power Level : 8.3 dBmVDownstream SNR : 37.1 dB


wat about these?

[hairy_mick]

Now thats too high ideal level should be in the negs -4 if its in the + then the low freq signals will be high this can flood the tuner causing errors.

[pjuk]

Hi all,

Could someone confirm if these are correct
Cable Modem Downstream Downstream Lock : Locked
Downstream Channel Id : 0
Downstream Frequency : 586750000 Hz
Downstream Modulation : QAM64
Downstream Symbol Rate : 6952 Ksym/sec
Downstream Interleave Depth : taps12Increment17
Downstream Receive Power Level : -14.1 dBmV
Downstream SNR : 28.6 dBThanks in advance,

Phil

[GuyVXT]

how about these

Downstream Lock : Locked
Downstream Channel Id : 31
Downstream Frequency : 402750000 Hz
Downstream Modulation : QAM256
Downstream Symbol Rate : 5360.537 Ksym/sec
Downstream Interleave Depth : taps32Increment4
Downstream Receive Power Level : 7.5 dBmV
Downstream SNR : 40.7 dB


Upstream Lock : Locked
Upstream Channel ID : 2
Upstream Frequency : 29200000 Hz
Upstream Modulation : QPSK
Upstream Symbol Rate : 2560 Ksym/sec
Upstream transmit Power Level : 40.0 dBmV
Upstream Mini-Slot Size : 2

[slowcoach]

http://www.cableforum.co.uk/board/12/26006-cable-modem-signal-levels.html

[pjuk]

Thanks slowcoach for pointing that out but I had read it before posting and couldn't get my head around it

Phil

[GuyVXT]

Thanks slowcoach for pointing that out but I had read it before posting and couldn't get my head around it

Phil

ditto.. bit ambiguous

''Downstream Receive Power: Ideally +/- 3dBmV, cause for concern at around +/- 8dBmV, different modems handle the higher and lower levels differently however I'd expect to see service degredation at that point''

that could mean different modems can handle +-8 or +-18 or +-54?

mines an ntl:250 btw, due to the last comment about degredation at +-8 on some modems... im guessing my 7.5 is pretty bad?

[slowcoach]

My brand new 255 modem is showing the Downstream Receive Power Level around the -10.0 dBmV mark and the engineer was satisfied with it.
So far the level hasn't proved to be life threatening. :dozey:

[homealone]

My brand new 255 modem is showing the Downstream Receive Power Level around the -10.0 dBmV mark and the engineer was satisfied with it.
So far the level hasn't proved to be life threatening. :dozey:

as iggy said in the sticky, a spot 'bad' reading may not be the only reason for a poor connection, but the nearer to nominal you are, the better, one assumes ?

mine currently


Downstream Receive Power Level : 4.1 dBmV
Downstream SNR : 37.8 dB

Upstream transmit Power Level : 47.8 dBmV

[slowcoach]

as iggy said in the sticky, a spot 'bad' reading may not be the only reason for a poor connection, but the nearer to nominal you are, the better, one assumes ?
[/code]
One would think so.