are these downstream power levels right

[jellyfish]

I am on XL BB (20Mb)

and these are my reading from the CM

Downstream Lock : Locked
Downstream Channel Id : 54
Downstream Frequency : 307000000 Hz
Downstream Modulation : QAM256
Downstream Symbol Rate : 6952 Ksym/sec
Downstream Interleave Depth : taps12Increment17
Downstream Receive Power Level : 11.3 dBmV
Downstream SNR : 43.0 dB

Upstream Lock : Locked
Upstream Channel ID : 7
Upstream Frequency : 45800000 Hz
Upstream Modulation : QPSK
Upstream Symbol Rate : 5120 Ksym/sec
Upstream transmit Power Level : 41.2 dBmV
Upstream Mini-Slot Size : 4

Network Access : Allowed
Maximum Downstream Data Rate : 20480000
Maximum Upstream Data Rate : 768000
Maximum Upstream Channel Burst : 3044
Maximum Number of CPEs : 1
Modem Capability : Concatenation Enabled, Fragametation Enabled, PHS Enabled

I am sure the Downstream Power Level is too high, yet when I do some speeds tests I am getting what I am expecting 18-20 MB

if I stick a 10 dB attenuator on to the CM will my downstream signal level drop to an acceptable level.

[Mick Fisher]

I am sure the Downstream Power Level is too high, yet when I do some speeds tests I am getting what I am expecting 18-20 MB

In that case I wouldn't worry about it.


if I stick a 10 dB attenuator on to the CM will my downstream signal level drop to an acceptable level.
No idea. Try it and see what happens.

[Peter_]

Your downstream is to high and should be as near to zero as possible so try the attenuator, if no different call support only if your speed deteriorates.

[pip08456]

I am sure the Downstream Power Level is too high, yet when I do some speeds tests I am getting what I am expecting 18-20 MB

if I stick a 10 dB attenuator on to the CM will my downstream signal level drop to an acceptable level.

If it works don't try to fix it.

[General Maximus]

If it works don't try to fix it.

I think you meant to say "if it ain't broken don't fix it"

[jellyfish]

will see how it goes over the next few days, monitor the speed and then perform necessary action to resolve it.

[Mick Fisher]

I think you meant to say "if it ain't broken don't fix it"
Can't argue with that. :tu:

[pip08456]

I think you meant to say "if it ain't broken don't fix it"

Merely semantics but yes.

[jb66]

It'll sit pretty happy at 11db, you should have a 10db forward path attenuator on not the old style, as the old style attenuates your upstream too

[jellyfish]

just as a bit of trial and error plugged in a 10 db Forward Path Attenuator

getting these results


Cable Modem Downstream
Downstream Lock : Locked
Downstream Channel Id : 54
Downstream Frequency : 307000000 Hz
Downstream Modulation : QAM256
Downstream Symbol Rate : 6952 Ksym/sec
Downstream Interleave Depth : taps12Increment17
Downstream Receive Power Level : 1.1 dBmV
Downstream SNR : 42.5 dB



Cable Modem Upstream
Upstream Lock : Locked
Upstream Channel ID : 7
Upstream Frequency : 45800000 Hz
Upstream Modulation : QPSK
Upstream Symbol Rate : 5120 Ksym/sec
Upstream transmit Power Level : 42.2 dBmV
Upstream Mini-Slot Size : 4


Cable Modem Operation Configuration
Network Access : Allowed
Maximum Downstream Data Rate : 20480000
Maximum Upstream Data Rate : 768000
Maximum Upstream Channel Burst : 3044
Maximum Number of CPEs : 1
Modem Capability : Concatenation Enabled, Fragametation Enabled, PHS Enabled


Getting an between 10-17 MB this evening .. so not sure if the attenuator has caused issues with my connection, will unplug and try some speed tests again.

[jb66]

You wont see a diference either way, downstream power levels play a small part in speed, its more to do with congestion on the network. Signal wise upstream and SNR are more important than downstream power. You should keep it on

[Sephiroth]

jb66 is spot on. Speed varies by the minute and the FPA will prebent the modem amplifier from being overdriven.