View Full Version : Modem Event Log Details
Hello,
Just wondered if someone could kindly explain what this means below, and is there anything to be concerned about.
Thu Dec 10 12:39:53 2009 Thu Dec 10 12:39:53 2009 Critical (3) Started Unicast Maintenance Ranging - No Response received -
Thu Dec 10 10:17:00 2009 Thu Dec 10 10:17:00 2009 Information (7) New UCD in effect
Thu Dec 10 10:17:00 2009 Thu Dec 10 10:17:00 2009 Information (7) Starting on-the-fly UCD change.
Thu Dec 10 01:31:06 2009 Thu Dec 10 01:31:06 2009 Information (7) The s/w filename specified in the config file is the same as ...
Thu Dec 10 01:31:06 2009 Thu Dec 10 01:31:06 2009 Information (7) A software upgrade filename was specified in the config file.
Thu Dec 10 01:31:06 2009 Thu Dec 10 01:31:06 2009 Information (7) Authorized
Thu Dec 10 01:31:06 2009 Thu Dec 10 01:31:06 2009 Information (7) Registration complete!
Thu Dec 10 01:31:06 2009 Thu Dec 10 01:31:06 2009 Information (7) We registered with a DOCSIS 1.0 config file!
Thu Dec 10 01:31:06 2009 Thu Dec 10 01:31:06 2009 Information (7) Received a REG-RSP message from the CMTS...
Thu Dec 10 01:31:05 2009 Thu Dec 10 01:31:05 2009 Information (7) Sending a REG-REQ to the CMTS...
Thu Dec 10 01:31:05 2009 Thu Dec 10 01:31:05 2009 Information (7) CableModem SNMP configure complete
Thu Dec 10 01:31:05 2009 Thu Dec 10 01:31:05 2009 Information (7) IP init completed ok
Thu Dec 10 01:31:05 2009 Thu Dec 10 01:31:05 2009 Information (7) CableModem TFTP init ok
Thu Dec 10 01:31:05 2009 Thu Dec 10 01:31:05 2009 Information (7) CableModem DHCP client init ok
Thu Dec 10 01:31:05 2009 Thu Dec 10 01:31:05 2009 Critical (3) DHCP WARNING - Non-critical field invalid in response.
I have exactly the logs in my modem and the is nothing of any consequence in that post.
Below is my standard response to this common question.
Be careful of reading modem logs, because what happens when you reboot your modem is that every single update for that modem is received at the same time giving you those worrying logs.
Virgin also disable most of the updates as they are not required so making it look even worse.
Sephiroth
10-12-2009, 16:58
What are the entries after the Unicast message? All of them please.
What are the entries after the Unicast message? All of them please.
The will be nothing else in a standard modem other than what he has posted above, I could post virtually identical logs to the above.;)
Sephiroth
10-12-2009, 17:29
The will be nothing else in a standard modem other than what he has posted above, I could post virtually identical logs to the above.;)
Wouldn't that depend on whether or not there were following T4 timeouts?
True we see these (esp-. Unicast Maintenance Ranging) - and if the ranging request is satisfied before the retry exhaustion count, then it's insignificant.
But, if there are enough T4s then the modem would reset because it would have been dropped by the CMTS.
Or am I wong (as I often am)?
Ignitionnet
10-12-2009, 17:53
Wouldn't that depend on whether or not there were following T4 timeouts?
True we see these (esp-. Unicast Maintenance Ranging) - and if the ranging request is satisfied before the retry exhaustion count, then it's insignificant.
But, if there are enough T4s then the modem would reset because it would have been dropped by the CMTS.
Or am I wong (as I often am)?
It's the modem ramping up transmit power Seph. Only thing of interest is if it pops up a message like this:
Wed Dec 2 01:53:18 2009 Wed Dec 2 01:53:18 2009 Critical (3) 16 consecutive T3 timeouts while trying to range on upstream channel
Otherwise those are of no interest. Modem starts at 8dBmV and increases transmit power by 3dBmV incrementing T3 counter while it goes. After 16 of these, transmit power being 56dBmV, if modem is still not receiving any unicast traffic from CMTS it's hosed and we re-commence ranging.
1 x T4 will take a modem offline.
A pretty diagram may help, this if for once the modem is operational only though, not initial ranging:
http://www.cisco.com/image/gif/paws/22543/cm_dropping_offline1.gif
Wouldn't that depend on whether or not there were following T4 timeouts?
True we see these (esp-. Unicast Maintenance Ranging) - and if the ranging request is satisfied before the retry exhaustion count, then it's insignificant.
But, if there are enough T4s then the modem would reset because it would have been dropped by the CMTS.
Or am I wong (as I often am)?
We tend to see the T3's and T4's in the VMNG300 50Mb modem as we get a lot more information from that piece of kit, but I have not seen them in any of the other modems as yet.
I have no doubt that they do have the same issues but tend not to show them in the logs.
Broadbandings will let us know if that is correct.
Sephiroth
10-12-2009, 18:14
It's the modem ramping up transmit power Seph. Only thing of interest is if it pops up a message like this:
Wed Dec 2 01:53:18 2009 Wed Dec 2 01:53:18 2009 Critical (3) 16 consecutive T3 timeouts while trying to range on upstream channel
Otherwise those are of no interest. Modem starts at 8dBmV and increases transmit power by 3dBmV incrementing T3 counter while it goes. After 16 of these, transmit power being 56dBmV, if modem is still not receiving any unicast traffic from CMTS it's hosed and we re-commence ranging.
1 x T4 will take a modem offline.
A pretty diagram may help, this if for once the modem is operational only though, not initial ranging:
http://www.cisco.com/image/gif/paws/22543/cm_dropping_offline1.gif
BBings - that's more or less what I said (although I should have said a number of T3s rather than T4). I was asking VMBoy to send the rest of the event log to see if that is what was happening.
I regard it as unlikely but was just being thorough.
It's frustrating when we are only given the picture a CP wishes us to see!
What are the entries after the Unicast message? All of them please.
I have been off-line since then, so here are 2 new entries now that I am back.
Thu Dec 10 16:29:28 2009 Thu Dec 10 16:29:28 2009 Information (7) New UCD in effect
Thu Dec 10 16:29:28 2009 Thu Dec 10 16:29:28 2009 Information (7) Starting on-the-fly UCD change.
I have been off-line since then, so here are 2 new entries now that I am back.
Thu Dec 10 16:29:28 2009 Thu Dec 10 16:29:28 2009 Information (7) New UCD in effect
Thu Dec 10 16:29:28 2009 Thu Dec 10 16:29:28 2009 Information (7) Starting on-the-fly UCD change.
Were you offline because of the modem.
Were you offline because of the modem.
No, I was meaning the PC was switched off.
No, I was meaning the PC was switched off.
Just wanted to be sure.;)
Just wanted to be sure.;)
No problem.
I had posted the next 2 lines in my modem event log as per Sephiroth's request.
Sephiroth
10-12-2009, 19:04
No problem.
I had posted the next 2 lines in my modem event log as per Sephiroth's request.
Well, as Moldova thought, there being no further negative events following the ranging request, your event list was absolutely clean.
If you're technically minded you could follow the link that BBings provided which is Cisco's authoritative explanation of what happens. You have to move between two flowcharts - but if you read the whole article you'll appreciate that running a cable network is not so simple; all the CMs have to operate within a tight spec and the CMTS has to own and manage a relationship with each CM while handling all the data you intend tyo upload/download. Quite an undertaking..
Why has my upstream speed gone down to 27Mbps.
Here are some levels from modem.
Cable Modem Upstream
Upstream Lock : Locked
Upstream Channel ID : 1
Upstream Frequency : 18800000 Hz
Upstream Modulation : QPSK
Upstream Symbol Rate : 2560 Ksym/sec
Upstream transmit Power Level : 46.0 dBmV
Upstream Mini-Slot Size : 2
Now I bet the response will be that the power level is too high.
Sephiroth
10-12-2009, 19:12
Why has my upstream speed gone down to 27Mbps.
Here are some levels from modem.
Cable Modem Upstream
Upstream Lock : Locked
Upstream Channel ID : 1
Upstream Frequency : 18800000 Hz
Upstream Modulation : QPSK
Upstream Symbol Rate : 2560 Ksym/sec
Upstream transmit Power Level : 46.0 dBmV
Upstream Mini-Slot Size : 2
Now I bet the response will be that the power level is too high.
27Mbps upstream? Are you sure? Upstream?
27Mbps upstream? Are you sure? Upstream?
That would be rather fast if it was not a typo.:D
https://www.cableforum.co.uk/images/local/2009/12/59.png (http://www.speedtest.net)
https://www.cableforum.co.uk/images/local/2009/12/59.png (http://www.speedtest.net)
The way you posted made it look like 27Mb not 0.27Mb which is why we found it funny.
So are they reducing the uploads now by 50%?
I have never experienced problems with upload speed before until now.
So are they reducing the uploads now by 50%?
I have never experienced problems with upload speed before until now.
No still the same.
Check this link out if you downloaded the amounts specified during the time periods shown you will have your speed cut to the limits listed.
http://www.virginmedia.com/help/traffic-management.php
No still the same.
Check this link out if you downloaded the amounts specified during the time periods shown you will have your speed cut to the limits listed.
http://www.virginmedia.com/help/traffic-management.php
What do you mean no still the same, I have just checked your link and it says for the M customers that it's throttled by 50%
Does uploading so much data count to this or is it just downloads?
What do you mean no still the same, I have just checked your link and it says for the M customers that it's throttled by 50%
Does uploading so much data count to this or is it just downloads?
You would not be getting almost 7Mb if you were being traffic managed, but only tech support can confirm one way or another.
Ignitionnet
10-12-2009, 19:37
Uploading so much data? Were you uploading when you did the earlier test, and did you do it avoiding that weird antivirus proxy of yours?
Have you contacted Virgin yet?
No I wasn't and never upload while doing those tests, and I haven't been uploading anything today either, and it was without the proxy.
Contacting virgin? what about, this upstream issue you mean?
Ignitionnet
10-12-2009, 19:47
No I wasn't and never upload while doing those tests, and I haven't been uploading anything today either, and it was without the proxy.
Contacting virgin? what about, this upstream issue you mean?
The speed issues you've been posting about for the past few days. Any problems with pings?
Sephiroth
10-12-2009, 19:57
Your upstream speed has dropped because it's peak time, VM are operating (it seems from what we've pieced together) on half/partial capacity at regional head ends and we're more or less where we were with your previous Edinburgh thread.
BT OpenReach there you go?
Your upstream speed has dropped because it's peak time, VM are operating (it seems from what we've pieced together) on half/partial capacity at regional head ends and we're more or less where we were with your previous Edinburgh thread.
So why was the upstream not dropped last night at this time?
---------- Post added at 20:27 ---------- Previous post was at 20:08 ----------
Not so quick to answer that one though.
Sephiroth
10-12-2009, 20:34
So why was the upstream not dropped last night at this time?
---------- Post added at 20:27 ---------- Previous post was at 20:08 ----------
Not so quick to answer that one though.
I had to think really hard about this one.
Er - that was yesterday. You could have posted upload speeds a few seconds later and they could have said what it said today.
You really don't know how to treat people who are trying to help you.
And by the way I haven't downloaded 750MB of data, so why am I being hit, and the 5 hours are up anyway.
http://www.virginmedia.com/help/traffic-management.php
---------- Post added at 20:37 ---------- Previous post was at 20:35 ----------
I had to think really hard about this one.
Er - that was yesterday. You could have posted upload speeds a few seconds later and they could have said what it said today.
Er...wrong, the upload speeds if you care to look were normal yesterday.
And by the way I haven't downloaded 750MB of data, so why am I being hit, and the 5 hours are up anyway.
http://www.virginmedia.com/help/traffic-management.php
You cannot just assume that you are being traffic managed, you need to call support for confirmation.
https://www.cableforum.co.uk/images/local/2009/12/58.png (http://www.speedtest.net)
It may be a fault, ring up to check and let us know the result.
It may be a fault, ring up to check and let us know the result.
I am just off the phone after calling 151, and he said like has been said previously there is high utilisation in my area.
I am not traffic managed according to him.
Sephiroth
10-12-2009, 21:21
And by the way I haven't downloaded 750MB of data, so why am I being hit, and the 5 hours are up anyway.
http://www.virginmedia.com/help/traffic-management.php
---------- Post added at 20:37 ---------- Previous post was at 20:35 ----------
Er...wrong, the upload speeds if you care to look were normal yesterday.
Exactly. You said in the earlier post: "So why was the upstream not dropped last night at this time?"
NOT dropped. Right? NOT dropped yesterday.
I'm saying that with those instantaneous speed tests you could run them a few seconds later and get a totally different result - like dropped speed. But as there is a nationwide problem with VM and we've done your stats to death, you appear to be part of the sad problem facing many others.
Not what I wanted to hear but thanks again Sephiroth.
---------- Post added at 22:04 ---------- Previous post was at 21:43 ----------
Hi, sorry me again,
Just noticed a change in the Cable Modem Upstream.
Earlier it had Upstream Modulation : QPSK, but now when the upstream is back to normal it says Upstream Modulation : QAM16
Would this be anything to do with the upstream speed change earlier this afternoon?
Lastly what is this on the fly stuff in the modem log, never seen that until recently.
Sephiroth
10-12-2009, 22:19
QPSK carries 2 bits per symbol. 16QAM carries 4 bits per symbol. Put very simply, when the network is under pressure or line quality is poor, the modulation will fall to the highest sustainable rate. QPSK modulation carries 2 bits per symbol and 16QAM carries 4 bits per symbol. That's half capacity.
BBings can give you the full skinny if you need it. But I don't think you do.
QPSK carries 2 bits per symbol. 16QAM carries 4 bits per symbol. Put very simply, when the network is under pressure or line quality is poor, the modulation will fall to the highest sustainable rate. QPSK modulation carries 2 bits per symbol and 16QAM carries 4 bits per symbol. That's half capacity.
BBings can give you the full skinny if you need it. But I don't think you do.
So in simple terms are you saying that having QAM16 showing in the modem log is better than QPSK as far as the best speeds are concerned?
Sephiroth
10-12-2009, 22:41
So in simple terms are you saying that having QAM16 showing in the modem log is better than QPSK as far as the best speeds are concerned?
Yes.
Yes.
I really appreciate your help on this.
Thank you.
:)
ASM is enabled on your cmts so when upstream SNR/CNR drops, rather then you losing your connection the modulation type is switched to QPSK. You may run at reduced speeds on QPSK.
ASM is enabled on your cmts so when upstream SNR/CNR drops, rather then you losing your connection the modulation type is switched to QPSK. You may run at reduced speeds on QPSK.
Thank you for that info.
Why would it drop though, or is that a new matter entirely.
It may drop whilst modulation type is changed, however should SNR/CNR be < 17 db you may suffer a intermittent connection even on QPSK.
Sephiroth
10-12-2009, 23:42
Thank you for that info.
Why would it drop though, or is that a new matter entirely.
The CNR could drop with variation in temperature, intentional optical power change (e.g. during upgrade, downgrade or maintenance), optical poer change through fault, laser degradation.
You guys sure know your stuff, thanks again.
Ignitionnet
11-12-2009, 13:45
ASM is enabled on your cmts so when upstream SNR/CNR drops, rather then you losing your connection the modulation type is switched to QPSK. You may run at reduced speeds on QPSK.
Yuck.
I am back to QPSK again for some strange reason.
Ignitionnet
11-12-2009, 14:06
No strange reason Xocemp kindly explained it. Try disconnecting and reconnecting by rebooting your modem and see if you pick up a different upstream.
Sephiroth
11-12-2009, 14:12
No strange reason Xocemp kindly explained it. Try disconnecting and reconnecting by rebooting your modem and see if you pick up a different upstream.
He's good - eh?
But first capture and post your modem event log before it's wiped!
Sorry I had re-booted the modem before I copied the event log.
I rebooted by resetting the modem using the Reset Defaults and not at the power, is that ok that way?
PS, I've an engineer booked next week to look at the fluctuating power levels.
Fri Dec 11 14:30:51 2009 Fri Dec 11 14:30:51 2009 Information (7) The s/w filename specified in the config file is the same as ...
Fri Dec 11 14:30:51 2009 Fri Dec 11 14:30:51 2009 Information (7) A software upgrade filename was specified in the config file.
Fri Dec 11 14:30:51 2009 Fri Dec 11 14:30:51 2009 Information (7) Authorized
Fri Dec 11 14:30:51 2009 Fri Dec 11 14:30:51 2009 Information (7) Registration complete!
Fri Dec 11 14:30:51 2009 Fri Dec 11 14:30:51 2009 Information (7) We registered with a DOCSIS 1.0 config file!
Fri Dec 11 14:30:51 2009 Fri Dec 11 14:30:51 2009 Information (7) Received a REG-RSP message from the CMTS...
Fri Dec 11 14:30:50 2009 Fri Dec 11 14:30:50 2009 Information (7) Sending a REG-REQ to the CMTS...
Fri Dec 11 14:30:50 2009 Fri Dec 11 14:30:50 2009 Information (7) CableModem SNMP configure complete
Fri Dec 11 14:30:50 2009 Fri Dec 11 14:30:50 2009 Information (7) IP init completed ok
Fri Dec 11 14:30:50 2009 Fri Dec 11 14:30:50 2009 Information (7) CableModem TFTP init ok
Fri Dec 11 14:30:50 2009 Fri Dec 11 14:30:50 2009 Information (7) CableModem DHCP client init ok
Fri Dec 11 14:30:50 2009 Fri Dec 11 14:30:50 2009 Critical (3) DHCP WARNING - Non-critical field invalid in response.
Time Not Established Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Time Not Established Information (7) MAP w/initial maintenance region received
Time Not Established Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Time Not Established Information (7) MAP w/initial maintenance region received
Time Not Established Time Not Established Information (7) Downstream sync ok
Time Not Established Time Not Established Information (7) Beginning initial ranging...
Time Not Established Time Not Established Information (7) downstream time sync acquired...
Time Not Established Time Not Established Information (7) Downstream sync ok
Time Not Established Time Not Established Information (7) starting ds time sync acquisition...
Time Not Established Time Not Established Information (7) Locked on the downstream. Waiting for UCDs...
Time Not Established Time Not Established Information (7) Downstream lock ok
Time Not Established Time Not Established Information (7) Sync Start
---------- Post added at 14:38 ---------- Previous post was at 14:37 ----------
Oh and the Upstream is still at QPSK after the re-boot.
Ignitionnet
11-12-2009, 14:43
Upstream Frequency : 18800000 Hz
If you're on that one still try and get off it - lower frequencies tend to be noisier.
Needs the local network staff to fix whatever is causing noise on the network to be honest.
If you're on that one still try and get off it - lower frequencies tend to be noisier.
Needs the local network staff to fix whatever is causing noise on the network to be honest.
Yes that is what I have Upstream Frequency :18800000 Hz
So it's a low frequency then?
Can I ask the engineer to take me off that frequency then?
Ignitionnet
11-12-2009, 14:55
Yes that is what I have Upstream Frequency :18800000 Hz
So it's a low frequency then?
Can I ask the engineer to take me off that frequency then?
No, it's handed out in a round-robin stylie. Restarting the modem until you get on another one is the only option to get away from it. That said the kit load balances even when you are online so you could end up anywhere.
There is nothing the engineer who comes by can do about the upstream congestion.
There is nothing the engineer who comes by can do about the upstream congestion.
I understand that, it's the power levels fluctuating is why he was booked according to Virgin Media Tech UK support.
Still confused as to why you said and I quote "If you're on that one still try and get off it - lower frequencies tend to be noisier"
---------- Post added at 15:48 ---------- Previous post was at 14:59 ----------
There are some criticals at the end of this event log.
Fri Dec 11 15:10:47 2009 Fri Dec 11 15:10:47 2009 Information (7) The s/w filename specified in the config file is the same as ...
Fri Dec 11 15:10:47 2009 Fri Dec 11 15:10:47 2009 Information (7) A software upgrade filename was specified in the config file.
Fri Dec 11 15:10:47 2009 Fri Dec 11 15:10:47 2009 Information (7) Authorized
Fri Dec 11 15:10:47 2009 Fri Dec 11 15:10:47 2009 Information (7) Registration complete!
Fri Dec 11 15:10:47 2009 Fri Dec 11 15:10:47 2009 Information (7) We registered with a DOCSIS 1.0 config file!
Fri Dec 11 15:10:47 2009 Fri Dec 11 15:10:47 2009 Information (7) Received a REG-RSP message from the CMTS...
Fri Dec 11 15:10:46 2009 Fri Dec 11 15:10:46 2009 Information (7) Sending a REG-REQ to the CMTS...
Fri Dec 11 15:10:46 2009 Fri Dec 11 15:10:46 2009 Information (7) CableModem SNMP configure complete
Fri Dec 11 15:10:46 2009 Fri Dec 11 15:10:46 2009 Information (7) IP init completed ok
Fri Dec 11 15:10:46 2009 Fri Dec 11 15:10:46 2009 Information (7) CableModem TFTP init ok
Fri Dec 11 15:10:46 2009 Fri Dec 11 15:10:46 2009 Information (7) CableModem DHCP client init ok
Fri Dec 11 15:10:46 2009 Fri Dec 11 15:10:46 2009 Critical (3) DHCP WARNING - Non-critical field invalid in response.
Time Not Established Time Not Established Information (7) MAP w/initial maintenance region received
Time Not Established Time Not Established Information (7) Downstream sync ok
Time Not Established Time Not Established Information (7) Beginning initial ranging...
Time Not Established Time Not Established Information (7) downstream time sync acquired...
Time Not Established Time Not Established Information (7) Downstream sync ok
Time Not Established Time Not Established Information (7) starting ds time sync acquisition...
Time Not Established Time Not Established Information (7) Locked on the downstream. Waiting for UCDs...
Time Not Established Time Not Established Information (7) Downstream lock ok
Time Not Established Time Not Established Information (7) Sync Start
Fri Dec 11 14:30:50 2009 Fri Dec 11 14:30:50 2009 Critical (3) DHCP WARNING - Non-critical field invalid in response.
Time Not Established Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Time Not Established Critical (3) No Ranging Response received - T3 time-out
---------- Post added at 17:23 ---------- Previous post was at 15:48 ----------
I've been on QPSK all afternoon and evening!
https://www.cableforum.co.uk/images/local/2009/12/55.png (http://www.speedtest.net)
Sephiroth
11-12-2009, 17:48
@ VMbOY
Can we keep your issues to one thread please?
My upstream modulation has just changed due to manual re-boot of the modem and is now QAM16 and you can see below the upstream is looking normal.
https://www.cableforum.co.uk/images/local/2009/12/53.png (http://www.speedtest.net)
Sephiroth
11-12-2009, 18:00
But remember, you have issues in your area and it will fluctuate. So perhaps you need to sit these problems out.
Ignitionnet
11-12-2009, 19:17
So upstream frequency now changed?
Sephiroth
11-12-2009, 19:26
So upstream frequency now changed?
You're a pixie, BB. Here's me trying to close this issue down on VMboy's other thread and you're busy stroking his G spot!
But remember, you have issues in your area and it will fluctuate.
Funny then how VM BB support tell me there are NO issues in my area.
---------- Post added at 20:29 ---------- Previous post was at 20:26 ----------
So upstream frequency now changed?
Yes it had, from QPSK to QAM16.
Sephiroth
11-12-2009, 21:53
Funny then how VM BB support tell me there are NO issues in my area.
---------- Post added at 20:29 ---------- Previous post was at 20:26 ----------
Yes it had, from QPSK to QAM16.
So what do you think is wrong? Because we've given you the best advice available - stuff that the VM support staff don't have in their scripts and very clearly your upstream function is misbehaving.
If you think the modem's the cause, ask for a replacement. From the evidence you've provided, it's unlikely to be your modem but by no means impossible.
It is now for VM to sort out. I believe you have an engineer comming. Let us know how it pans out.
So what do you think is wrong? Because we've given you the best advice available - stuff that the VM support staff don't have in their scripts and very clearly your upstream function is misbehaving.
I wish I knew for sure.
If you think the modem's the cause, ask for a replacement. From the evidence you've provided, it's unlikely to be your modem but by no means impossible.
I will ask the engineer, see what he says.
It is now for VM to sort out. I believe you have an engineer comming. Let us know how it pans out.
Will do.
---------- Post added at 23:47 ---------- Previous post was at 22:22 ----------
Would you believe it, I had to reboot my PC, and I am back with QPSK again, this is just unbelievable.
If this tech can't come up with a solution then I walk for sure.
Can I just nip in here to say that my Downstream Modem Power Level reached as high as 12:00 dVmB this morning.
Ain't that high a reading?
Ignitionnet
12-12-2009, 13:43
Just as well an engineer is visiting really.
Just as well an engineer is visiting really.
When I checked it this morning it was even higher at 12.5 dBmV
I hope though that if I require an attenuator fitted I will notice a difference in less problems or whatever it's supposed to address.
Ignitionnet
14-12-2009, 09:50
Given your problem, as has been mentioned previously, relates to upstream issues I doubt it.
Given your problem, as has been mentioned previously, relates to upstream issues I doubt it.
So what good will the engineer do?
I read many articles about power level for downstream being too high, and I remember the chap at support said as long as it didn't go over 12.0 dBmV, well it has gone over that now, is it necessary to sort that level out?
Ignitionnet
14-12-2009, 10:28
It's necessary for your blood pressure for you to stop obsessing over every number, digit and dial on your cable modem before you do yourself an injury. Refreshing the status page every morning and running endless speed tests isn't healthy. Looking at the status page and refreshing it lots even if the speed tests are ok also not good.
The engineer will adjust the downstream power to ensure it's more within spec but as mentioned it's not the cause of your slow speeds though it should be taken care of to avoid it becoming an 'issue'. At your last post your speeds were fine, let the guy in to do his job and tweak it and stop stressing mebbe?
Sephiroth
14-12-2009, 11:14
@VMBoy
BBings is spot on. Leave it alone on the forum till the engineer'd been. We've exhausted everything we can do. You've got tons of stuff withh which to be aware when the engineer comes. Write it down in an orderly manner so that you can ask him questions (without p*ssing him off) and then get back to us.
Schtumm till then please!
Here are the details now that an attenuator has been fitted, but unfortunately I have just reset the modem, and the upstream is now back as QPSK.
Can I ask as each time I turn on the computer does the modem search for a new upstream modulation, or am I stuck with QPSK ? is there anything I can do to get the QAM16 back again?
Cable Modem Upstream
Upstream Lock : Locked
Upstream Channel ID : 1
Upstream Frequency : 18800000 Hz
Upstream Modulation : QPSK
Upstream Symbol Rate : 2560 Ksym/sec
Upstream transmit Power Level : 51.5 dBmV
Upstream Mini-Slot Size : 2
Cable Modem Downstream
Downstream Lock : Locked
Downstream Channel Id : 4
Downstream Frequency : 331000000 Hz
Downstream Modulation : QAM256
Downstream Symbol Rate : 5360.537 Ksym/sec
Downstream Interleave Depth : taps32Increment4
Downstream Receive Power Level : 4.9 dBmV
Downstream SNR : 38.7 dB
Wed Dec 16 18:13:28 2009 Wed Dec 16 18:13:28 2009 Information (7) The s/w filename specified in the config file is the same as ...
Wed Dec 16 18:13:28 2009 Wed Dec 16 18:13:28 2009 Information (7) A software upgrade filename was specified in the config file.
Wed Dec 16 18:13:28 2009 Wed Dec 16 18:13:28 2009 Information (7) Authorized
Wed Dec 16 18:13:28 2009 Wed Dec 16 18:13:28 2009 Information (7) Registration complete!
Wed Dec 16 18:13:28 2009 Wed Dec 16 18:13:28 2009 Information (7) We registered with a DOCSIS 1.0 config file!
Wed Dec 16 18:13:28 2009 Wed Dec 16 18:13:28 2009 Information (7) Received a REG-RSP message from the CMTS...
Wed Dec 16 18:13:28 2009 Wed Dec 16 18:13:28 2009 Information (7) Sending a REG-REQ to the CMTS...
Wed Dec 16 18:13:28 2009 Wed Dec 16 18:13:28 2009 Information (7) CableModem SNMP configure complete
Wed Dec 16 18:13:28 2009 Wed Dec 16 18:13:28 2009 Information (7) IP init completed ok
Wed Dec 16 18:13:27 2009 Wed Dec 16 18:13:27 2009 Information (7) CableModem TFTP init ok
Wed Dec 16 18:13:27 2009 Wed Dec 16 18:13:27 2009 Information (7) CableModem DHCP client init ok
Wed Dec 16 18:13:27 2009 Wed Dec 16 18:13:27 2009 Critical (3) DHCP WARNING - Non-critical field invalid in response.
Time Not Established Time Not Established Information (7) MAP w/initial maintenance region received
Time Not Established Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Time Not Established Information (7) MAP w/initial maintenance region received
Time Not Established Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Time Not Established Information (7) MAP w/initial maintenance region received
Time Not Established Time Not Established Information (7) Downstream sync ok
Time Not Established Time Not Established Information (7) Beginning initial ranging...
Time Not Established Time Not Established Information (7) downstream time sync acquired...
Time Not Established Time Not Established Information (7) Downstream sync ok
Time Not Established Time Not Established Information (7) starting ds time sync acquisition...
Time Not Established Time Not Established Information (7) Locked on the downstream. Waiting for UCDs...
Time Not Established Time Not Established Information (7) Downstream lock ok
Time Not Established Time Not Established Information (7) Sync Start
Cable Modem Upstream Burst
Req
Init Maint
Per Maint
Short Data
Long Data
(1)
(3)
(4)
(5)
(6)
Modulation Type QPSK QPSK QPSK QPSK QPSK
Differential Encoding Off Off Off Off Off
Preamble Length 64 128 128 100 80
Preamble Value Offset 396 6 6 396 396
FEC Error Correction (T) 0 5 5 3 9
FEC Codeword Information Bytes (k) 16 34 34 78 232
Scrambler Seed 338 338 338 338 338
Maximum Burst Size 0 0 0 35 254
Guard Time Size 8 48 48 25 134
Last Codeword Length Fixed Fixed Fixed Short Short
Scrambler on/off On On On On On
Ignitionnet
16-12-2009, 18:41
Every modem reboot not PC.
Every modem reboot not PC.
So let me get this right, if I re-boot the modem enough till the QAM16 is back, will it remain unless the modem is re-booted again?
In other words once I have the QAM16 then it will stay with that setting unless there is a modem re-boot.
What is the preferred method of re-booting the modem, is it turning off it's power, or using the reset on the modem config?
Reset Defaults
This page allows user to restore defaults, and Cable Modem will reset after pressing Apply button.
---------- Post added at 19:24 ---------- Previous post was at 18:46 ----------
I just re-booted the modem and I am back with QAM16 which gives me my full upload speed of 512.
Will it stay like this unless there is a power cut or if a manual reset is performed?
And lastly as this may well be part of the problem as to why the upstream type keeps changing, but why on the Cable Modem Upstream Burst I see 5 columns numbered 1 to 6 no mention of number 2, and the Modulation Type has QPSK for 1,3 and 4, and 16QAM for 5 and 6 which is short data and long data column.
---------- Post added at 19:45 ---------- Previous post was at 19:24 ----------
Anyone? lol
Ignitionnet
16-12-2009, 19:55
Yes I know exactly what the score is but I'm not going to explain it all, stop panicking QPSK is of itself not necessarily a bad thing so long as performance is fine with it. Different modulation types in different bursts are fine. Your modem can be moved from one upstream to another at any time.
There are loads of resources online if you wish to learn a bit more about all these fields and what they actually do mean. I find Brady Volpe's site is excellent.
Yes I know exactly what the score is but I'm not going to explain it all, stop panicking QPSK is of itself not necessarily a bad thing so long as performance is fine with it.
But that's the problem, the performance is lowered especially on the upstream when I have the QPSK, reason being why I wanted to know if there was a solution.
So it's really luck whether I go back to 16QAM after a modem re-boot/re-set or not.
:cool:
---------- Post added at 20:35 ---------- Previous post was at 20:01 ----------
I meant to say the attenuator sticky label had fallen off, because it looked so grubby and the details on the label were well and truly worn, couldn't stick it back on so just left it off, actually looked like it had been used previously.
Can I just ask what you think of this log detail for today, which is the only one for today's date.
Just a bit concerned of the criticals here, now I'm only asking so please don't shoot me head off. :D
Thu Dec 17 09:26:06 2009 Thu Dec 17 09:26:06 2009 Critical (3) Started Unicast Maintenance Ranging - No Response received - ...
Wed Dec 16 22:44:19 2009 Wed Dec 16 22:44:19 2009 Information (7) New UCD in effect
Wed Dec 16 19:12:05 2009 Wed Dec 16 19:12:05 2009 Information (7) The s/w filename specified in the config file is the same as ...
Wed Dec 16 19:12:05 2009 Wed Dec 16 19:12:05 2009 Information (7) A software upgrade filename was specified in the config file.
Wed Dec 16 19:12:05 2009 Wed Dec 16 19:12:05 2009 Information (7) Authorized
Wed Dec 16 19:12:05 2009 Wed Dec 16 19:12:05 2009 Information (7) Registration complete!
Wed Dec 16 19:12:05 2009 Wed Dec 16 19:12:05 2009 Information (7) We registered with a DOCSIS 1.0 config file!
Wed Dec 16 19:12:05 2009 Wed Dec 16 19:12:05 2009 Information (7) Received a REG-RSP message from the CMTS...
Wed Dec 16 19:12:04 2009 Wed Dec 16 19:12:04 2009 Information (7) Sending a REG-REQ to the CMTS...
Wed Dec 16 19:12:04 2009 Wed Dec 16 19:12:04 2009 Information (7) CableModem SNMP configure complete
Wed Dec 16 19:12:04 2009 Wed Dec 16 19:12:04 2009 Information (7) IP init completed ok
Wed Dec 16 19:12:04 2009 Wed Dec 16 19:12:04 2009 Information (7) CableModem TFTP init ok
Wed Dec 16 19:12:04 2009 Wed Dec 16 19:12:04 2009 Information (7) CableModem DHCP client init ok
Wed Dec 16 19:12:04 2009 Wed Dec 16 19:12:04 2009 Critical (3) DHCP WARNING - Non-critical field invalid in response.
Time Not Established Time Not Established Information (7) MAP w/initial maintenance region received
Time Not Established Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Time Not Established Information (7) MAP w/initial maintenance region received
Time Not Established Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Time Not Established Information (7) MAP w/initial maintenance region received
Time Not Established Time Not Established Information (7) Downstream sync ok
Time Not Established Time Not Established Information (7) Beginning initial ranging...
Time Not Established Time Not Established Information (7) downstream time sync acquired...
Time Not Established Time Not Established Information (7) Downstream sync ok
Time Not Established Time Not Established Information (7) starting ds time sync acquisition...
Time Not Established Time Not Established Information (7) Locked on the downstream. Waiting for UCDs...
Time Not Established Time Not Established Information (7) Downstream lock ok
Time Not Established Time Not Established Critical (3) Received Response to Broadcast Maintenance Request, But no Un...
Time Not Established Time Not Established Information (7) Reset downstream scanning state!
Time Not Established Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Time Not Established Information (7) MAP w/initial maintenance region received
Time Not Established Time Not Established Critical (3) No Ranging Response received - T3 time-out
Time Not Established Time Not Established Information (7) MAP w/initial maintenance region received
Sephiroth
17-12-2009, 14:01
Can I just ask what you think of this log detail for today, which is the only one for today's date.
Just a bit concerned of the criticals here, now I'm only asking so please don't shoot me head off. :D
Thu Dec 17 09:26:06 2009 Thu Dec 17 09:26:06 2009 Critical (3) Started Unicast Maintenance Ranging - No Response received - ...
Wed Dec 16 22:44:19 2009 Wed Dec 16 22:44:19 2009 Information (7) New UCD in effect
Wed Dec 16 19:12:05 2009 Wed Dec 16 19:12:05 2009 Information (7) The s/w filename specified in the config file is the same as ...
Wed Dec 16 19:12:05 2009 Wed Dec 16 19:12:05 2009 Information (7) A software upgrade filename was specified in the config file.
Wed Dec 16 19:12:05 2009 Wed Dec 16 19:12:05 2009 Information (7) Authorized
Wed Dec 16 19:12:05 2009 Wed Dec 16 19:12:05 2009 Information (7) Registration complete!
Wed Dec 16 19:12:05 2009 Wed Dec 16 19:12:05 2009 Information (7) We registered with a DOCSIS 1.0 config file!
Wed Dec 16 19:12:05 2009 Wed Dec 16 19:12:05 2009 Information (7) Received a REG-RSP message from the CMTS...
Wed Dec 16 19:12:04 2009 Wed Dec 16 19:12:04 2009 Information (7) Sending a REG-REQ to the CMTS...
Wed Dec 16 19:12:04 2009 Wed Dec 16 19:12:04 2009 Information (7) CableModem SNMP configure complete
Wed Dec 16 19:12:04 2009 Wed Dec 16 19:12:04 2009 Information (7) IP init completed ok
Wed Dec 16 19:12:04 2009 Wed Dec 16 19:12:04 2009 Information (7) CableModem TFTP init ok
Wed Dec 16 19:12:04 2009 Wed Dec 16 19:12:04 2009 Information (7) CableModem DHCP client init ok
Wed Dec 16 19:12:04 2009 Wed Dec 16 19:12:04 2009 Critical (3) DHCP WARNING - Non-critical field invalid in response.
Time Not Established Time Not Established Information (7) MAP w/initial maintenance region received
Time Not Established Time Not Established Critical (3) No Ranging Response received - T3 time-out
......
POW. :sniper:
You asked that question in post #1 and it was fully answered in post #6. Any more repeat questions?
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