High downstream power level

[tWm_]

I recently upgraded from 20mb to 100mb (XXL) and the speed seems to fluctuate greatly. I didn't really know what I was looking for but I see most other peoples power levels are in single figures while mine are in the twenties.

Downstream Channels Lock Status Modulation Channel ID Max Raw Bit Rate Frequency Power SNR Docsis/EuroDocsis lockedLocked QAM256 26 55616000 Kbits/sec 306750000 Hz 21.8 dBmV 44.6 dB Hybrid Locked QAM256 25 55616000 Kbits/sec 298750000 Hz 21.4 dBmV 43.4 dB Hybrid Locked QAM256 27 55616000 Kbits/sec 314750000 Hz 22.2 dBmV 44.2 dB Hybrid Locked QAM256 28 55616000 Kbits/sec 322750000 Hz 22.3 dBmV 44.5 dB Hybrid Unlocked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV 0.0 dB Unknown Unlocked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV 0.0 dB Unknown Unlocked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV 0.0 dB Unknown Unlocked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV 0.0 dB Unknown

Upstream Channels Lock Status Modulation Channel ID Max Raw Bit Rate Frequency PowerLocked ATDMA 5 20480 Kbits/sec 45800000 Hz 45.0 dBmV Unlocked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV Unlocked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV Unlocked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV

Could this be a cause and is it something I should get adjusted?

[Stythinator]

Hiya,

You will need to call VM on 150 and get an Engineer Booked out to see you. They will Lower the Powerlevels and your Internet will be much faster. They are way too high.

[craigj2k11]

bladdy nora!! never seen power levels that high!!

[Sephiroth]

---

tWm_ wrote:

I recently upgraded from 20mb to 100mb (XXL) and the speed seems to fluctuate greatly. I didn't really know what I was looking for but I see most other peoples power levels are in single figures while mine are in the twenties.

Downstream Channels Lock Status Modulation Channel ID Max Raw Bit Rate Frequency Power SNR Docsis/EuroDocsis locked

Locked QAM256 26 55616000 Kbits/sec 306750000 Hz 21.8 dBmV 44.6 dB Hybrid

Locked QAM256 25 55616000 Kbits/sec 298750000 Hz 21.4 dBmV 43.4 dB Hybrid

Locked QAM256 27 55616000 Kbits/sec 314750000 Hz 22.2 dBmV 44.2 dB Hybrid

Locked QAM256 28 55616000 Kbits/sec 322750000 Hz 22.3 dBmV 44.5 dB Hybrid

Upstream Channels Lock Status Modulation Channel ID Max Raw Bit Rate Frequency Power

Locked ATDMA 5 20480 Kbits/sec 45800000 Hz 45.0 dBmV 

Could this be a cause and is it something I should get adjusted?

---

Please see the Power Levels/SNR sticky for more information on the effects of this.  I assume you're near the street cabinet.  But I would have expected your upstream power to be lower.  Is it stable at c. 45 dBmv or does it fluctuate by more than 1 dBmv?

[tWm_]

Thank you all, I will call Virgin and get them to sort it out.

I am fairly near the cabinet yes. The connection is stable as in I don't suffer disconnects but the performance goes all over the place. One moment I can pull 103mb, the next it'll be in the 30's, this is via ethernet not wifi. I've never encountered an issue with my upload, that stays around the 5mb mark even when the download is fluctuating.

Some time ago on my 20mb package I was suffering disconnects and was told the power on my line was too low and needed to be raised, perhaps they were a little keen.

[Dai_T]

Hi tWm_

I have checked your connection to the network and I can see that the power levels are still very high. 

I can see that you have called us since your first post and a technician has been booked for you.

Please let us know the outcome of the tech visit.

[tWm_]

Engineer came and fitted an attenuator to the back of the Superhub which brought the levels down from the low twenties to about 6.

However, my Internet stopped working this morning so I reset the Superhub and now my power levels are all in minus figures.

Lock Status Modulation Channel ID Max Raw Bit Rate Frequency Power SNR Docsis/EuroDocsis lockedLocked QAM256 26 55616000 Kbits/sec 306750000 Hz -3.8 dBmV 38.7 dB Hybrid Locked QAM256 25 55616000 Kbits/sec 298750000 Hz -4.2 dBmV 38.3 dB Hybrid Locked QAM256 27 55616000 Kbits/sec 314750000 Hz -3.5 dBmV 38.9 dB Hybrid Locked QAM256 28 55616000 Kbits/sec 322750000 Hz -3.4 dBmV 39.0 dB Hybrid

My apologies if the formatting of that has gone, I'm not sure how to retain it when I paste it from the hub screen.

I assume the power on the network in my area must have been lowered in the last week which means with the effects of the attenuator I'm now in minus figures?

Just checking if I'm okay to remove it for the purpose of testing or whether I should be calling out an engineer, again?

Should have mentioned, the attenuator is 15db.

[Sephiroth]

---

tWm_ wrote:

Engineer came and fitted an attenuator to the back of the Superhub which brought the levels down from the low twenties to about 6.

However, my Internet stopped working this morning so I reset the Superhub and now my power levels are all in minus figures.

Lock Status Modulation Channel ID Max Raw Bit Rate Frequency Power SNR Docsis/EuroDocsis locked

Locked QAM256 26 55616000 Kbits/sec 306750000 Hz -3.8 dBmV 38.7 dB Hybrid

Locked QAM256 25 55616000 Kbits/sec 298750000 Hz -4.2 dBmV 38.3 dB Hybrid

Locked QAM256 27 55616000 Kbits/sec 314750000 Hz -3.5 dBmV 38.9 dB Hybrid

Locked QAM256 28 55616000 Kbits/sec 322750000 Hz -3.4 dBmV 39.0 dB Hybrid

My apologies if the formatting of that has gone, I'm not sure how to retain it when I paste it from the hub screen.

I assume the power on the network in my area must have been lowered in the last week which means with the effects of the attenuator I'm now in minus figures?

Just checking if I'm okay to remove it for the purpose of testing or whether I should be calling out an engineer, again?

Should have mentioned, the attenuator is 15db.

---

With those SNR levels, the downstream power is OK.  In the winter the power level wil rise by c. 3 dBmv.

If you need it examining why the internet might have stopped working, we'd need to see full stats including upstream plus the event log. 

Perhaps do that if it stops again and note what the top light is doing when it stops.

For example, if the upstream is struggling, you might see high upstream power; eventually  it gives up and reinitialises; that is the same as "stops working".

As to formatting, a simple copy & paste does it for most people.  PPutting it through a word processor usually screws it up.  Of course after your post you could edit it tidy-ish like I did for you

[tWm_]

Thank you. I will keep an eye on it over the next week or so.

[tWm_]

My internet was down again this morning and I had to reboot the Superhub as I couldn't even log into it over the network. The top light on the hub was blue and stuck on with no blinking at all.

My line power however now seems to be at -1 rather than -3

As requested here are the various pieces of information from the hub

Connection
Startup Procedure
Procedure	Status	Comment
Acquire Downstream Channel	290750000 Hz	Locked
Connectivity State	OK	Operational
Boot State	OK	Operational
Configuration File	OK	 
Security	Enabled	BPI+

Downstream Channels
Lock Status	Modulation	Channel ID	Max Raw Bit Rate	Frequency	Power	SNR	Docsis/EuroDocsis locked
Locked	QAM256	51	55616000 Kbits/sec	290750000 Hz	-1.8 dBmV	40.1 dB	Hybrid
Locked	QAM256	52	55616000 Kbits/sec	298750000 Hz	-1.4 dBmV	40.6 dB	Hybrid
Locked	QAM256	53	55616000 Kbits/sec	306750000 Hz	-1.0 dBmV	40.8 dB	Hybrid
Locked	QAM256	54	55616000 Kbits/sec	314750000 Hz	-0.7 dBmV	41.3 dB	Hybrid
Locked	QAM256	55	55616000 Kbits/sec	322750000 Hz	-0.2 dBmV	41.3 dB	Hybrid
Unlocked	Unknown	0	0 Ksym/sec	0 Hz	0.0 dBmV	0.0 dB	Unknown
Unlocked	Unknown	0	0 Ksym/sec	0 Hz	0.0 dBmV	0.0 dB	Unknown
Unlocked	Unknown	0	0 Ksym/sec	0 Hz	0.0 dBmV	0.0 dB	Unknown

Upstream Channels
Lock Status	Modulation	Channel ID	Max Raw Bit Rate 	Frequency	Power
Locked	ATDMA	3	20480 Kbits/sec	27400000 Hz	41.0 dBmV
Unlocked	Unknown	0	0 Ksym/sec	0 Hz	0.0 dBmV
Unlocked	Unknown	0	0 Ksym/sec	0 Hz	0.0 dBmV
Unlocked	Unknown	0	0 Ksym/sec	0 Hz	0.0 dBmV

Primary Downstream Service Flow
Downstream(0)
SFID	6429
Max Traffic Rate	111000000 bps
Max Traffic Burst	10000 bytes
Mix Traffic Rate	0 bps
Primary Upstream Service Flow
Upstream(0)
SFID	6428
Max Traffic Rate	5120000 bps
Max Traffic Burst	16320 bytes
Mix Traffic Rate	0 bps
Max Concatenated Burst	16320 bytes
Scheduling Type	Best Effort
Current System Time:Fri Jun 22 09:12:58 2012

Event Log
Time	Priority	Description
Fri Jun 22 09:02:04 2012  	 Critical (3) 	 DHCP FAILED - Requested Info not supported.;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0; 
 
Fri Jun 22 09:01:48 2012  	 Notice (6) 	 CMTS DCC 290750000 MHz 

Fri Jun 22 08:26:05 2012  	 Critical (3) 	 TFTP failed - Request sent - No Response;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.0;CM-VER=3.0; 

Fri Jun 22 08:24:19 2012  	 Critical (3) 	 SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.0;CM-VER=3.0; 

Fri Jun 22 08:24:17 2012  	 Critical (3) 	 SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.0;CM-VER=3.0; 

Fri Jun 22 08:22:20 2012  	 Critical (3) 	 DHCP FAILED - Requested Info not supported.;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.0;CM-VER=3.0; 

Fri Jun 22 08:22:16 2012  	 Critical (3) 	 No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.0;CM-VER=3.0; 

Fri Jun 22 08:18:42 2012  	 Critical (3) 	 DHCP FAILED - Requested Info not supported.;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.0;CM-VER=3.0; 

Fri Jun 22 08:15:40 2012  	 Critical (3) 	 SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.0;CM-VER=3.0; 

Fri Jun 22 08:15:39 2012  	 Critical (3) 	 SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.0;CM-VER=3.0; 

Fri Jun 22 08:14:28 2012  	 Critical (3) 	 Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.0;CM-VER=3.0; 

Fri Jun 22 08:07:58 2012  	 Critical (3) 	 DHCP FAILED - Requested Info not supported.;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.0;CM-VER=3.0; 

Fri Jun 22 08:07:43 2012  	 Critical (3) 	 SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.0;CM-VER=3.0; 

Fri Jun 22 08:07:39 2012  	 Critical (3) 	 SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.0;CM-VER=3.0; 

Fri Jun 22 08:05:49 2012  	 Critical (3) 	 DHCP FAILED - Requested Info not supported.;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.0;CM-VER=3.0; 

Fri Jun 22 08:03:29 2012  	 Critical (3) 	 DHCP FAILED - Requested Info not supported.;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.0;CM-VER=3.0; 

Fri Jun 22 07:57:01 2012  	 Critical (3) 	 DHCP FAILED - Requested Info not supported.;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.0;CM-VER=3.0; 

Fri Jun 22 07:54:55 2012  	 Critical (3) 	 DHCP FAILED - Requested Info not supported.;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.0;CM-VER=3.0; 

Fri Jun 22 07:53:16 2012  	 Critical (3) 	 Ranging Request Retries exhausted;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.0;CM-VER=3.0; 

Fri Jun 22 07:47:27 2012  	 Critical (3) 	 DHCP FAILED - Requested Info not supported.;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.0;CM-VER=3.0; 

Fri Jun 22 07:45:16 2012  	 Critical (3) 	 DHCP FAILED - Requested Info not supported.;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.0;CM-VER=3.0; 

Fri Jun 22 07:43:15 2012  	 Critical (3) 	 DHCP FAILED - Requested Info not supported.;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.0;CM-VER=3.0; 

Fri Jun 22 07:41:06 2012  	 Critical (3) 	 DHCP FAILED - Requested Info not supported.;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.0;CM-VER=3.0; 

Fri Jun 22 07:38:55 2012  	 Critical (3) 	 DHCP FAILED - Requested Info not supported.;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.0;CM-VER=3.0; 

Fri Jun 22 07:36:52 2012  	 Critical (3) 	 DHCP FAILED - Requested Info not supported.;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.0;CM-VER=3.0; 

Fri Jun 22 07:34:50 2012  	 Critical (3) 	 DHCP FAILED - Requested Info not supported.;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.0;CM-VER=3.0; 

Fri Jun 22 07:32:41 2012  	 Critical (3) 	 DHCP FAILED - Requested Info not supported.;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.0;CM-VER=3.0; 

Fri Jun 22 07:30:34 2012  	 Critical (3) 	 DHCP FAILED - Requested Info not supported.;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.0;CM-VER=3.0; 

Fri Jun 22 07:28:23 2012  	 Critical (3) 	 DHCP FAILED - Requested Info not supported.;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.0;CM-VER=3.0; 

Fri Jun 22 07:26:11 2012  	 Critical (3) 	 DHCP FAILED - Requested Info not supported.;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.0;CM-VER=3.0; 
 Time Not Established 	 Critical (3) 	 DHCP FAILED - Requested Info not supported.;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.0;CM-VER=3.0; 
 Time Not Established 	 Critical (3) 	 No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.0;CM-VER=3.0; 

I have been noticing that loading sites has been slow, not in terms of content but getting there to begin with, as if the DNS is lagging. I tried using Google's DNS servers but can't say that it made any noticeable difference.

The only other things I notice is I now have a new IP address as of this morning which is much different to before starting 213. rather than 88.