Wonnov Menny
31-07-2009, 13:03
Hello,
Last week I had the BB upgraded on my VIP pack from 20mb to 50mb. I've had quite a few problems, especially relating to speed issues. 2 engineers and one senior tech have been out, they have tried/done various things, checked/replaced cables, altered settings in the street cabinet, altered settings on my PC, in fact they couldn't do enough.
They told me I'm on the same UBR as I was on 20mb which is perfectly fine for 50mb, but they checked it anyway, everything was fine.
From what they tell me, it appears that there is not a decent speed test site anywhere, or one that is compatible with 50mb. Some give extremely low results (1.96mbit), others give absurdly high results (184mbit). Apparently, the only one that gives a true and correct reading is virgin medias own 50mb test, but this is only available to the tech/install guys.
The senior tech spent a few hours here, doing various tests.. every level and setting all the way from their end to my house was checked and adjusted to be spot on. In the end the problem turned out to be my firewall. Using VM speedtest, on the techs laptop, D/L speed was average 46mb, on my pc anywhere from 18-26mb. Disabled the firewall on mine and the D/L speed went up to 45-47mb. Repeated the tests numerous times with firewall on/off, same conclusive results every time. The tech explained anything over 45mb is considered good and within parameters.
He told me to speak to my firewall tech support people to see if there's a setting I can change. They have suggested I upgrade to latest release just out, then retest. The problem I have is, how can I test if the new firewall software improves things if I can't use the 50mb VM speed test (which is the only one that works)? VM should allow a speed test site just for the 50mb users to use if none of the others work with 50mb.
The upstream/downstream settings from my modem are shown below. Based on the above, I know all the levels etc must now be correct & set spot on, but what does all the other stuff mean such as correctable & uncorrectable codewords, timeouts, ranging status, etc? Could someone please explain.
-------------------------------------------------
Cable Modem Downstream
DS-1 DS-2 DS-3 DS-4
Frequency 298750000 306750000 314750000 N/A
Lock Status
(QAM Lock/FEC Sync/MPEG Lock) Y/Y/Y Y/Y/Y Y/Y/Y N/N/N
Channel Id 36 37 38 N/A
Modulation 256QAM 256QAM 256QAM N/A
Symbol Rate
(Msym/sec) 6.952 6.952 6.952 N/A
Interleave Depth I=12
J=17 I=12
J=17 I=12
J=17 N/A
Power Level
(dBmV) 6.22 6.31 6.16 N/A
RxMER
(dB) 35.78 36.17 36.84 N/A
Correctable
Codewords 1293 490 561 N/A
Uncorrectable
Codewords 339 313 307 N/A
Cable Modem Upstream
US-1 US-2 US-3 US-4
Channel Type 1.0 N/A N/A N/A
Channel ID 1 N/A N/A N/A
Frequency
(Hz) 45808000 N/A N/A N/A
Ranging Status Success N/A N/A N/A
Modulation 16QAM N/A N/A N/A
Symbol Rate
(KSym/sec) 2560 N/A N/A N/A
Mini-Slot Size 2 N/A N/A N/A
Power Level
(dBmV) 49.71 N/A N/A N/A
T1 Timeouts 4
T2 Timeouts 0 0 0 0
T3 Timeouts 10 0 0 0
T4 Timeouts 1 0 0 0
------------------------------------------------------
In addition, I checked the modem log file, it's full of loads of these critical errors and warnings (below) going right back to the install date last week. The tech guys must obviously think they're ok, but could someone please explain what they actually mean?...
------log file extract (edited to save space)------
Critical (3) SYNC Timing Synchronization failure - Loss of Sync;
Critical (3) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out
Warning (5) MDD message timeout;
Critical (3) No Ranging Response received - T3 time-out;
Warning (5) MDD message timeout;
Critical (3) No Ranging Response received - T3 time-out;
Warning (5) MDD message timeout;
Critical (3) No Ranging Response received - T3 time-out;
Warning (5) MDD message timeout;
Critical (3) No Ranging Response received - T3 time-out
Warning (5) MDD message timeout;
etc
etc
Thanks in advance..
Last week I had the BB upgraded on my VIP pack from 20mb to 50mb. I've had quite a few problems, especially relating to speed issues. 2 engineers and one senior tech have been out, they have tried/done various things, checked/replaced cables, altered settings in the street cabinet, altered settings on my PC, in fact they couldn't do enough.
They told me I'm on the same UBR as I was on 20mb which is perfectly fine for 50mb, but they checked it anyway, everything was fine.
From what they tell me, it appears that there is not a decent speed test site anywhere, or one that is compatible with 50mb. Some give extremely low results (1.96mbit), others give absurdly high results (184mbit). Apparently, the only one that gives a true and correct reading is virgin medias own 50mb test, but this is only available to the tech/install guys.
The senior tech spent a few hours here, doing various tests.. every level and setting all the way from their end to my house was checked and adjusted to be spot on. In the end the problem turned out to be my firewall. Using VM speedtest, on the techs laptop, D/L speed was average 46mb, on my pc anywhere from 18-26mb. Disabled the firewall on mine and the D/L speed went up to 45-47mb. Repeated the tests numerous times with firewall on/off, same conclusive results every time. The tech explained anything over 45mb is considered good and within parameters.
He told me to speak to my firewall tech support people to see if there's a setting I can change. They have suggested I upgrade to latest release just out, then retest. The problem I have is, how can I test if the new firewall software improves things if I can't use the 50mb VM speed test (which is the only one that works)? VM should allow a speed test site just for the 50mb users to use if none of the others work with 50mb.
The upstream/downstream settings from my modem are shown below. Based on the above, I know all the levels etc must now be correct & set spot on, but what does all the other stuff mean such as correctable & uncorrectable codewords, timeouts, ranging status, etc? Could someone please explain.
-------------------------------------------------
Cable Modem Downstream
DS-1 DS-2 DS-3 DS-4
Frequency 298750000 306750000 314750000 N/A
Lock Status
(QAM Lock/FEC Sync/MPEG Lock) Y/Y/Y Y/Y/Y Y/Y/Y N/N/N
Channel Id 36 37 38 N/A
Modulation 256QAM 256QAM 256QAM N/A
Symbol Rate
(Msym/sec) 6.952 6.952 6.952 N/A
Interleave Depth I=12
J=17 I=12
J=17 I=12
J=17 N/A
Power Level
(dBmV) 6.22 6.31 6.16 N/A
RxMER
(dB) 35.78 36.17 36.84 N/A
Correctable
Codewords 1293 490 561 N/A
Uncorrectable
Codewords 339 313 307 N/A
Cable Modem Upstream
US-1 US-2 US-3 US-4
Channel Type 1.0 N/A N/A N/A
Channel ID 1 N/A N/A N/A
Frequency
(Hz) 45808000 N/A N/A N/A
Ranging Status Success N/A N/A N/A
Modulation 16QAM N/A N/A N/A
Symbol Rate
(KSym/sec) 2560 N/A N/A N/A
Mini-Slot Size 2 N/A N/A N/A
Power Level
(dBmV) 49.71 N/A N/A N/A
T1 Timeouts 4
T2 Timeouts 0 0 0 0
T3 Timeouts 10 0 0 0
T4 Timeouts 1 0 0 0
------------------------------------------------------
In addition, I checked the modem log file, it's full of loads of these critical errors and warnings (below) going right back to the install date last week. The tech guys must obviously think they're ok, but could someone please explain what they actually mean?...
------log file extract (edited to save space)------
Critical (3) SYNC Timing Synchronization failure - Loss of Sync;
Critical (3) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out
Warning (5) MDD message timeout;
Critical (3) No Ranging Response received - T3 time-out;
Warning (5) MDD message timeout;
Critical (3) No Ranging Response received - T3 time-out;
Warning (5) MDD message timeout;
Critical (3) No Ranging Response received - T3 time-out;
Warning (5) MDD message timeout;
Critical (3) No Ranging Response received - T3 time-out
Warning (5) MDD message timeout;
etc
etc
Thanks in advance..