Power levels

[Bullstein]

Are these modem stats ok?

I had a 15db attenuator fitted and my power levels were:

Downstream:
-2.1
-1.5
-2.9
-2.7

SNR:
41

Upstream:
41


I thought that the downstream power levels were getting close to the lower end of Optimum ( -3 to +7 ) so I decided to order a 10th attenuator off eBay (couldn't source a 12db one) to try and get it nearer the middle of optimum

My levels are now:

Downstream:
2.2
3.2
3.1
2.9

SNR:
42

Upstream:
41

Looks healthier to me?

[Sephiroth]

Your power levels are excellent. Being near to -3 isn't any kind of worry. Being at +7 is a worry because many modems (including mine) won't sync at +7.

[Nopanic]

Not syncing at 7 ? the limits changes all the time but generally sit with -10 to +10 ...

[Ignitionnet]

Odd. The Superhub / Netgear CG3101D is just fine at those power levels.

Locked QAM256 6 5360537 sym/sec 586000000 Hz 7.2 dBmV 42.3 dBmV EuroDocsis
Locked QAM256 1 5360537 sym/sec 546000000 Hz 7.0 dBmV 40.5 dBmV EuroDocsis
Locked QAM256 2 5360537 sym/sec 554000000 Hz 6.8 dBmV 40.4 dBmV EuroDocsis
Locked QAM256 3 5360537 sym/sec 562000000 Hz 6.8 dBmV 40.5 dBmV EuroDocsis
Locked QAM256 4 5360537 sym/sec 570000000 Hz 7.0 dBmV 40.4 dBmV EuroDocsis
Locked QAM256 5 5360537 sym/sec 578000000 Hz 6.5 dBmV 42.1 dBmV EuroDocsis
Not Locked Unknown 0 0 sym/sec 0 Hz 0.0 dBmV 0.0 dBmV Unknown
Not Locked Unknown 0 0 sym/sec 0 Hz 0.0 dBmV 0.0 dBmV Unknow

Upstream Bonded Channels Lock Status Modulation Channel ID Symbol Rate Frequency Power
Locked ATDMA 1 5120 Ksym/sec 54400000 Hz 36.2 dBmV
Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV
Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV
Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV

[qasdfdsaq]

A few VMNG300's (mine included) get flaky at or above +7db, mine specifically is more stable at -10 than it is at +7. General feedback seems the Superhub is more tolerant of higher downstream levels than the VMNG300.

[jb66]

Ive never came across the 7db threshold, i've seen loads of vmng300s on 10db or higher whirring away, its only when I've done a healthcheck while fixing other services i've came across it and attenuated.

[TJS]

Odd. The Superhub / Netgear CG3101D is just fine at those power levels.

Locked QAM256 6 5360537 sym/sec 586000000 Hz 7.2 dBmV 42.3 dBmV EuroDocsis
Locked QAM256 1 5360537 sym/sec 546000000 Hz 7.0 dBmV 40.5 dBmV EuroDocsis
Locked QAM256 2 5360537 sym/sec 554000000 Hz 6.8 dBmV 40.4 dBmV EuroDocsis
Locked QAM256 3 5360537 sym/sec 562000000 Hz 6.8 dBmV 40.5 dBmV EuroDocsis
Locked QAM256 4 5360537 sym/sec 570000000 Hz 7.0 dBmV 40.4 dBmV EuroDocsis
Locked QAM256 5 5360537 sym/sec 578000000 Hz 6.5 dBmV 42.1 dBmV EuroDocsis
Not Locked Unknown 0 0 sym/sec 0 Hz 0.0 dBmV 0.0 dBmV Unknown
Not Locked Unknown 0 0 sym/sec 0 Hz 0.0 dBmV 0.0 dBmV Unknow

Upstream Bonded Channels Lock Status Modulation Channel ID Symbol Rate Frequency Power
Locked ATDMA 1 5120 Ksym/sec 54400000 Hz 36.2 dBmV
Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV
Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV
Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV


6 channels?o_o

[Ignitionnet]

It's not VM.

---------- Post added at 09:52 ---------- Previous post was at 09:50 ----------

Ive never came across the 7db threshold, i've seen loads of vmng300s on 10db or higher whirring away, its only when I've done a healthcheck while fixing other services i've came across it and attenuated.

I've had one sync downstream at 15dBmV - this was being tested at the tap to confirm performance.