Observer

Low Upstream with CM600 Modem.

New modem and just noticed that my upstream power is really low.

Modem is Netgear CM600

Modem is on a direct line from tap to barrel connector to Modem. No splitter. 

Cable Connection
Is there anything I can do or do I need to get a truck roll?

 

 
 
Apply               Cancel     
Frequency start Value
This field below allows you to modify the frequency the cable modem start with its scan during initialization and registration. Enter the new start frequency and restart the cable modem for it to take effect.
Starting Frequency
 
Startup Procedure
ProcedureStatusComment
Acquire Downstream Channel555000000 HzLocked
Connectivity StateOKOperational
Boot StateOKOperational
SecurityEnableBPI+
IP Provisioning ModeOverride MDDIPv6 only
 
<tabindex=-1>Downstream Bonded Channels
ChannelLock StatusModulationChannel IDFrequencyPowerSNRCorrectablesUncorrectables
1LockedQAM2563555000000 Hz9.4 dBmV40.2 dB30
2LockedQAM2561543000000 Hz7.0 dBmV40.0 dB40
3LockedQAM2562549000000 Hz8.4 dBmV40.1 dB30
4LockedQAM2564561000000 Hz9.8 dBmV40.1 dB50
5LockedQAM2565567000000 Hz10.0 dBmV40.2 dB60
6LockedQAM2566573000000 Hz10.0 dBmV40.1 dB50
7LockedQAM2567579000000 Hz10.1 dBmV40.1 dB90
8LockedQAM2568585000000 Hz10.0 dBmV40.1 dB140
9LockedQAM2569591000000 Hz10.1 dBmV40.0 dB100
10LockedQAM25610597000000 Hz10.2 dBmV40.1 dB90
11LockedQAM25611603000000 Hz10.3 dBmV40.1 dB200
12LockedQAM25612609000000 Hz10.4 dBmV40.1 dB90
13LockedQAM25613615000000 Hz10.5 dBmV40.1 dB160
14LockedQAM25614621000000 Hz10.5 dBmV40.2 dB140
15LockedQAM25615627000000 Hz10.6 dBmV40.2 dB180
16LockedQAM25616633000000 Hz10.7 dBmV40.2 dB270
 
<tabindex=-1>Upstream Bonded Channels
ChannelLock StatusUS Channel TypeChannel IDSymbol RateFrequencyPower
1LockedATDMA505120 Ksym/sec24200000 Hz25.8 dBmV
2LockedTDMA492560 Ksym/sec19400000 Hz25.0 dBmV
3LockedATDMA515120 Ksym/sec30600000 Hz26.8 dBmV
4LockedATDMA522560 Ksym/sec37000000 Hz27.3 dBmV
 

Error Log

 
 
 
 
TimePriorityDescription
2017-02-17, 06:45:59Critical (3)Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=10:da:43:55:69:41;CMTS-MAC=00:01:5c:8c:fe:4c;CM-QOS=1.1;CM-VER=3.0;
2017-02-13, 11:33:38Critical (3)Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=10:da:43:55:69:41;CMTS-MAC=00:01:5c:8c:fe:4c;CM-QOS=1.1;CM-VER=3.0;
2017-02-07, 00:15:03Critical (3)Resetting the cable modem due to docsDevResetNow
2017-02-06, 19:15:56Critical (3)No Ranging Response received - T3 time-out;CM-MAC=10:da:43:55:69:41;CMTS-MAC=00:01:5c:8c:fe:4c;CM-QOS=1.0;CM-VER=3.0;
Time Not EstablishedCritical (3)Telnet user logged out.
Time Not EstablishedError (4)Missing BP Configuration Setting TLV Type: 17.8;CM-MAC=10:da:43:55:69:41;CMTS-MAC=00:01:5c:8c:fe:4c;CM-QOS=1.1;CM-VER=3.0;
Time Not EstablishedError (4)Missing BP Configuration Setting TLV Type: 17.9;CM-MAC=10:da:43:55:69:41;CMTS-MAC=00:01:5c:8c:fe:4c;CM-QOS=1.1;CM-VER=3.0;
Time Not EstablishedWarning (5)ToD request sent - No Response received;CM-MAC=10:da:43:55:69:41;CMTS-MAC=00:01:5c:8c:fe:4c;CM-QOS=1.0;CM-VER=3.0;
Time Not EstablishedNotice (6)Overriding MDD IP initialization parameters; IP provisioning mode = IPv6
Time Not EstablishedCritical (3)No Ranging Response received - T3 time-out;CM-MAC=10:da:43:55:69:41;CMTS-MAC=00:01:5c:8c:fe:4c;CM-QOS=1.0;CM-VER=3.0;
Time Not EstablishedCritical (3)No Ranging Response received - T3 time-out;CM-MAC=10:da:43:55:69:41;CMTS-MAC=00:01:5c:8c:fe:4c;CM-QOS=1.0;CM-VER=3.0;
Time Not EstablishedCritical (3)No Ranging Response received - T3 time-out;CM-MAC=10:da:43:55:69:41;CMTS-MAC=00:01:5c:8c:fe:4c;CM-QOS=1.0;CM-VER=3.0;

 

6 REPLIES 6
Proven Sharer

Re: Low Upstream with CM600 Modem.


@Krazijoe wrote:

New modem and just noticed that my upstream power is really low.

Modem is Netgear CM600

Modem is on a direct line from tap to barrel connector to Modem. No splitter. 

Cable Connection
Is there anything I can do or do I need to get a truck roll?

 

 
 
Apply               Cancel     
Frequency start Value
This field below allows you to modify the frequency the cable modem start with its scan during initialization and registration. Enter the new start frequency and restart the cable modem for it to take effect.
Starting Frequency
 
Startup Procedure
ProcedureStatusComment
Acquire Downstream Channel555000000 HzLocked
Connectivity StateOKOperational
Boot StateOKOperational
SecurityEnableBPI+
IP Provisioning ModeOverride MDDIPv6 only
 
<tabindex=-1>Downstream Bonded Channels
ChannelLock StatusModulationChannel IDFrequencyPowerSNRCorrectablesUncorrectables
1LockedQAM2563555000000 Hz9.4 dBmV40.2 dB30
2LockedQAM2561543000000 Hz7.0 dBmV40.0 dB40
3LockedQAM2562549000000 Hz8.4 dBmV40.1 dB30
4LockedQAM2564561000000 Hz9.8 dBmV40.1 dB50
5LockedQAM2565567000000 Hz10.0 dBmV40.2 dB60
6LockedQAM2566573000000 Hz10.0 dBmV40.1 dB50
7LockedQAM2567579000000 Hz10.1 dBmV40.1 dB90
8LockedQAM2568585000000 Hz10.0 dBmV40.1 dB140
9LockedQAM2569591000000 Hz10.1 dBmV40.0 dB100
10LockedQAM25610597000000 Hz10.2 dBmV40.1 dB90
11LockedQAM25611603000000 Hz10.3 dBmV40.1 dB200
12LockedQAM25612609000000 Hz10.4 dBmV40.1 dB90
13LockedQAM25613615000000 Hz10.5 dBmV40.1 dB160
14LockedQAM25614621000000 Hz10.5 dBmV40.2 dB140
15LockedQAM25615627000000 Hz10.6 dBmV40.2 dB180
16LockedQAM25616633000000 Hz10.7 dBmV40.2 dB270
 
<tabindex=-1>Upstream Bonded Channels
ChannelLock StatusUS Channel TypeChannel IDSymbol RateFrequencyPower
1LockedATDMA505120 Ksym/sec24200000 Hz25.8 dBmV
2LockedTDMA492560 Ksym/sec19400000 Hz25.0 dBmV
3LockedATDMA515120 Ksym/sec30600000 Hz26.8 dBmV
4LockedATDMA522560 Ksym/sec37000000 Hz27.3 dBmV
 

Error Log

 
 
 
 
TimePriorityDescription
2017-02-17, 06:45:59Critical (3)Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=10:da:43:55:69:41;CMTS-MAC=00:01:5c:8c:fe:4c;CM-QOS=1.1;CM-VER=3.0;
2017-02-13, 11:33:38Critical (3)Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=10:da:43:55:69:41;CMTS-MAC=00:01:5c:8c:fe:4c;CM-QOS=1.1;CM-VER=3.0;
2017-02-07, 00:15:03Critical (3)Resetting the cable modem due to docsDevResetNow
2017-02-06, 19:15:56Critical (3)No Ranging Response received - T3 time-out;CM-MAC=10:da:43:55:69:41;CMTS-MAC=00:01:5c:8c:fe:4c;CM-QOS=1.0;CM-VER=3.0;
Time Not EstablishedCritical (3)Telnet user logged out.
Time Not EstablishedError (4)Missing BP Configuration Setting TLV Type: 17.8;CM-MAC=10:da:43:55:69:41;CMTS-MAC=00:01:5c:8c:fe:4c;CM-QOS=1.1;CM-VER=3.0;
Time Not EstablishedError (4)Missing BP Configuration Setting TLV Type: 17.9;CM-MAC=10:da:43:55:69:41;CMTS-MAC=00:01:5c:8c:fe:4c;CM-QOS=1.1;CM-VER=3.0;
Time Not EstablishedWarning (5)ToD request sent - No Response received;CM-MAC=10:da:43:55:69:41;CMTS-MAC=00:01:5c:8c:fe:4c;CM-QOS=1.0;CM-VER=3.0;
Time Not EstablishedNotice (6)Overriding MDD IP initialization parameters; IP provisioning mode = IPv6
Time Not EstablishedCritical (3)No Ranging Response received - T3 time-out;CM-MAC=10:da:43:55:69:41;CMTS-MAC=00:01:5c:8c:fe:4c;CM-QOS=1.0;CM-VER=3.0;
Time Not EstablishedCritical (3)No Ranging Response received - T3 time-out;CM-MAC=10:da:43:55:69:41;CMTS-MAC=00:01:5c:8c:fe:4c;CM-QOS=1.0;CM-VER=3.0;
Time Not EstablishedCritical (3)No Ranging Response received - T3 time-out;CM-MAC=10:da:43:55:69:41;CMTS-MAC=00:01:5c:8c:fe:4c;CM-QOS=1.0;CM-VER=3.0;

 


@Krazijoe
I think you have a completely different problem - your incoming DS levels appear too high.  The gain settings on some trunk line amplifiers are probably in need of calibration.  You need to call TWC service for a line crew.  Be sure the person writing up the service request includes the following details:  User reports his internet modem DS levels on most channels are at/above +10.0 AND he has low US levels of 25 to 27 dBmV.

Observer

Re: Low Upstream with CM600 Modem.


@karlbeckman wrote:

@Krazijoe
I think you have a completely different problem - your incoming DS levels are too high.  The gain settings on some trunk cable amplifiers are probably in need of adjustment.  You need to call TWC service for a line crew.  Be sure the person writing up the service request includes the following:  User reports  his internet modem DS levels are at/above +10.0 AND low US levels of 25 to 27 dBmV.


Would throwing a -7DB splitter on there do any good? Or am I just applying a bandaid?

Proven Sharer

Re: Low Upstream with CM600 Modem.

It's a good temporary bandaid if it works until TWC can get their main trunk hardware fixed..  Be sure you put terminations on all unused port connectors to keep interference out.

Observer

Re: Low Upstream with CM600 Modem.

Added a splitter and now it's this, which is a little better but the Upstream power is still off.

<tabindex=-1>Downstream Bonded Channels
ChannelLock StatusModulationChannel IDFrequencyPowerSNRCorrectablesUncorrectables
1LockedQAM2562549000000 Hz3.0 dBmV39.4 dB90
2LockedQAM2561543000000 Hz1.7 dBmV39.4 dB120
3LockedQAM2563555000000 Hz4.1 dBmV39.5 dB50
4LockedQAM2564561000000 Hz4.6 dBmV39.5 dB80
5LockedQAM2565567000000 Hz4.8 dBmV39.6 dB100
6LockedQAM2566573000000 Hz4.7 dBmV39.5 dB100
7LockedQAM2567579000000 Hz4.8 dBmV39.5 dB120
8LockedQAM2568585000000 Hz4.7 dBmV39.4 dB170
9LockedQAM2569591000000 Hz4.7 dBmV39.3 dB130
10LockedQAM25610597000000 Hz4.9 dBmV39.5 dB110
11LockedQAM25611603000000 Hz5.0 dBmV39.5 dB220
12LockedQAM25612609000000 Hz5.1 dBmV39.5 dB120
13LockedQAM25613615000000 Hz5.2 dBmV39.5 dB170
14LockedQAM25614621000000 Hz5.3 dBmV39.7 dB180
15LockedQAM25615627000000 Hz5.4 dBmV39.4 dB190
16LockedQAM25616633000000 Hz5.4 dBmV39.6 dB280
 
<tabindex=-1>Upstream Bonded Channels
ChannelLock StatusUS Channel TypeChannel IDSymbol RateFrequencyPower
1LockedATDMA505120 Ksym/sec24200000 Hz31.5 dBmV
2LockedTDMA492560 Ksym/sec19400000 Hz31.0 dBmV
3LockedATDMA515120 Ksym/sec30600000 Hz32.0 dBmV
4LockedATDMA522560 Ksym/sec37000000 Hz32.8 dBmV
Expert

Re: Low Upstream with CM600 Modem.

Levels are a tad hot due to you haviing a decent outside plant that allows 8 way splitters... I'd put in a 4 way with terminators on the 3 unused ports or just leave it alone.... the modems can transmit as low as a +18 dBmv level.

All that TWC will do is put on a 10dB or 2- 6 dB attenuators.

You have no credible complaint for them to roll a truck...

 

Proven Sharer

Re: Low Upstream with CM600 Modem.

We should probably explain again for those curious folks who want to learn about the black magic of cable.  The upstream [US] channel power levels from each individual subscriber's modem are automatically adjusted up or down by the modem, based on how well the node at the far end of the cable hears them.  Low upstream levels don't indicate a modem failure; to the contrary,  that can only happen when everything is working really well.  High levels [above +51 dBmV] are bad, that's when 'the modem is shouting to be heard' over a combination of cable with high losses and interference and noise sneaking in that affect the far end.