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xiao
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Slow speed and a lot of Post RS errors

Hello,

I experienced this problem again this morning at 7am. My broadband has been terribly slow and unreliable (speed was less than 1Mb according to Netspeed). My ssh connection will be fine one minute then disconnected and this happens all the time.

Here is the Network Status (I rebooted the Modem 3 hours ago)

Downstream Channels Lock Status Channel ID Frequency Modulation Rx Power RxMER Pre RS Errors Post RS Errors
Locked 1 171000000 Hz 256 QAM 0.2 dBmV  32.3 dB 1836415 689
Locked 2 179000000 Hz 256 QAM -0.1 dBmV  32.4 dB 1668520 1440
Locked 3 187000000 Hz 256 QAM -0.5 dBmV  32.3 dB 1714184 371
Locked 4 195000000 Hz 256 QAM -0.6 dBmV  32.4 dB 1534569 949
Locked 5 203000000 Hz 256 QAM -0.8 dBmV  32.3 dB 1741328 1761
Locked 6 211000000 Hz 256 QAM -1.0 dBmV  32.4 dB 1404328 1200
Locked 7 219000000 Hz 256 QAM -1.2 dBmV  24.6 dB 343701226 342897154
Locked 8 227000000 Hz 256 QAM -1.2 dBmV  25.5 dB 343676801 336864077

 

Please note the Post RS errors in two channels.

Since April 2015, this problem has occurred many many times. Engineers visited a few times and never solved the problem. In last visit, I was told that the upgrade on my area (#F004742974) will solve the problem. BUT?

Can someone please assist?

Many thanks,

Xiao

 

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Superuser
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Re: Slow speed and a lot of Post RS errors

Your downstream SNR is too low across all channels, and abysmal on the two channels you mention. This is the cause of the high RS Errors.

It might be worth giving the coax cable a quick check for obvious signs of damage and kinks and connectors are hand tight.

You will need to contact VM again for resolution, either by waiting here about a week until a VM Forum Team Member picks up the thread, or give them a call on 150 from a VM line or 0345 454 1111 for a quicker response.

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xiao
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Re: Slow speed and a lot of Post RS errors

Thanks griffin.

An update about network status, now these two channels cannot lock and another one has lot Post RS Errors.

Downstream Channels Lock Status Channel ID Frequency Modulation Rx Power RxMER Pre RS Errors Post RS Errors
Locked 1 171000000 Hz 256 QAM 0.0 dBmV 32.2 dB 7632504 11304
Locked 2 179000000 Hz 256 QAM -0.5 dBmV 32.2 dB 8265806 311
Locked 3 187000000 Hz 256 QAM -0.8 dBmV 32.2 dB 7570029 322
Locked 4 195000000 Hz 256 QAM -0.9 dBmV 32.2 dB 7178524 316
Locked 5 203000000 Hz 256 QAM 0.0 dBmV 25.9 dB 456149186 431107010
Locked 6 211000000 Hz 256 QAM -1.5 dBmV 32.2 dB 7332191 314
NotLocked Unknown
NotLocked Unknown

 

Also there are a lot of "Lost MDD Timeout" in the log.

07/03/2017 17:33:17 GMT 84020200 Lost MDD Timeout
07/03/2017 17:33:17 GMT 84020200 Lost MDD Timeout
07/03/2017 17:33:17 GMT 84020200 Lost MDD Timeout
07/03/2017 17:33:17 GMT 84020200 Lost MDD Timeout
07/03/2017 17:33:17 GMT 84020200 Lost MDD Timeout
07/03/2017 17:33:17 GMT 84020200 Lost MDD Timeout
07/03/2017 17:33:17 GMT 84020200 Lost MDD Timeout
07/03/2017 17:33:17 GMT 84020200 Lost MDD Timeout
07/03/2017 17:33:17 GMT 84020200 Lost MDD Timeout
07/03/2017 17:33:17 GMT 84020200 Lost MDD Timeout
07/03/2017 17:33:17 GMT 84020200 Lost MDD Timeout
07/03/2017 17:33:17 GMT 84020200 Lost MDD Timeout
07/03/2017 17:33:17 GMT 84020200 Lost MDD Timeout
07/03/2017 17:33:17 GMT 84020200 Lost MDD Timeout
07/03/2017 17:33:17 GMT 84020200 Lost MDD Timeout
07/03/2017 17:33:17 GMT 84020200 Lost MDD Timeout
07/03/2017 17:33:17 GMT 84020200 Lost MDD Timeout
07/03/2017 17:33:17 GMT 84020200 Lost MDD Timeout
07/03/2017 17:33:17 GMT 84020200 Lost MDD Timeout
07/03/2017 17:33:17 GMT 84020200 Lost MDD Timeout
07/03/2017 17:33:17 GMT 84020200 Lost MDD Timeout
07/03/2017 17:33:17 GMT 84020200 Lost MDD Timeout
07/03/2017 17:33:17 GMT 84020200 Lost MDD Timeout
07/03/2017 17:33:17 GMT 84020200 Lost MDD Timeout
07/03/2017 17:33:17 GMT 84020200 Lost MDD Timeout
07/03/2017 17:33:17 GMT 84020200 Lost MDD Timeout
07/03/2017 17:33:17 GMT 84020200 Lost MDD Timeout
07/03/2017 17:33:17 GMT 84020200 Lost MDD Timeout
07/03/2017 17:33:17 GMT 84020200 Lost MDD Timeout
07/03/2017 17:33:17 GMT 84020200 Lost MDD Timeout
07/03/2017 17:33:17 GMT 84020200 Lost MDD Timeout

 

Help!

Xiao

 

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Forum Team
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Re: Slow speed and a lot of Post RS errors

Hi Xiao,

 

Thanks for posting!

 

I'm really sorry to hear you're having trouble with your connection.

 

Griffin is right, it looks like we're going to need to send a technician to take a look at this. I've sent you a private message (purple envelope at the top right of your screen) so I can arrange an appointment.

 

Speak soon Smiley Very Happy

 

Josh


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