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Really bad speeds in Colchester (50Kb/s)
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Old 30-05-2008, 09:59   #1
phoenix__
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Really bad speeds in Colchester (50Kb/s)
Hi All,

I'm on a 20Mb service in Colchester, and most of the time get a very good services. That said, over the last week or so I've noticed it been a bit slower but nothing too much to really bother me (maybe 10-15Mb). However this morning it's gone to pot. I'm currently getting about 50Kb/s from a download, and a debian upgrade earlier averaged 15Kb/s!

A quick look at the modem info page shows:
Downstream Recieve Power Level: 4.1dBmV
Downstream SNR: 30.8dB
and the maximum downstream data rate is correct at 20480000

The service status page on VMs site says there are no known problem. Anyone got any ideas or suggestions?
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Old 30-05-2008, 10:02   #2
whydoIneedatech
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Re: Really bad speeds in Colchester (50Kb/s)
Quote:
Originally Posted by phoenix__ View Post
Hi All,

I'm on a 20Mb service in Colchester, and most of the time get a very good services. That said, over the last week or so I've noticed it been a bit slower but nothing too much to really bother me (maybe 10-15Mb). However this morning it's gone to pot. I'm currently getting about 50Kb/s from a download, and a debian upgrade earlier averaged 15Kb/s!

A quick look at the modem info page shows:
Downstream Recieve Power Level: 4.1dBmV
Downstream SNR: 30.8dB
and the maximum downstream data rate is correct at 20480000

The service status page on VMs site says there are no known problem. Anyone got any ideas or suggestions?

Post your Upstream power and what modem you have.
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Old 30-05-2008, 10:06   #3
phoenix__
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Re: Really bad speeds in Colchester (50Kb/s)
It's the 255 modem, upstream is:
channel ID: 3
Frequency: 41000000 Hz
Modulation: QAM16
Symbol Rate: 1280 Ksym/sec
transmit power: 56.5dBmV
Mini-Slot size: 4
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Old 30-05-2008, 10:09   #4
whydoIneedatech
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Re: Really bad speeds in Colchester (50Kb/s)
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Originally Posted by phoenix__ View Post
It's the 255 modem, upstream is:
channel ID: 3
Frequency: 41000000 Hz
Modulation: QAM16
Symbol Rate: 1280 Ksym/sec
transmit power: 56.5dBmV
Mini-Slot size: 4
That power level does look high and a call to Tech Support may be in order from Sunday 1st of June it is free to call from a Virgin landline on 151 or you could call the premium rate number on 0906 212 1111
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Old 30-05-2008, 10:18   #5
phoenix__
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Re: Really bad speeds in Colchester (50Kb/s)
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Originally Posted by whydoIneedatech View Post
That power level does look high and a call to Tech Support may be in order from Sunday 1st of June it is free to call from a Virgin landline on 151 or you could call the premium rate number on 0906 212 1111
Thanks, what would an acceptable level be for this?
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Old 30-05-2008, 10:37   #6
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Re: Really bad speeds in Colchester (50Kb/s)
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Originally Posted by phoenix__ View Post
Thanks, what would an acceptable level be for this?
Well mine is 39.4 dBmV.
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Old 30-05-2008, 11:35   #7
whydoIneedatech
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Re: Really bad speeds in Colchester (50Kb/s)
All I can say is that it looks high and free call from Sunday may be in order as sometimes NTL say if its not broke do not fix it.

But it would be best to check withTech Support
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Old 30-05-2008, 11:54   #8
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Re: Really bad speeds in Colchester (50Kb/s)
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Originally Posted by phoenix__ View Post
Modulation: QAM16
That can't be right can it? I thought Virgin was either 64 or 256?
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Old 30-05-2008, 19:12   #9
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Re: Really bad speeds in Colchester (50Kb/s)
^It is only used for upstream modulation, QAM16 and QPSK are the 2 main upload modulations Virgin use.

QAM64 and QAM256 are the main download modulations, though QAM64 is getting abit dated and getting replaced by QAM256.
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