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Standard User huwwatkins
(member) Wed 21-Mar-12 23:46:37
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CRC/ES errors?


[link to this post]
 
Somewhat related to my other issues - Can someone tell me how much of a problem these errors might be and if they are a lot?

CRC:
http://i44.tinypic.com/sq11qx.jpg

ES
http://i42.tinypic.com/r7r8ew.jpg

At the last spike the router gave up and re-synced lower.
Standard User tommy45
(fountain of knowledge) Thu 22-Mar-12 00:06:08
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Re: CRC/ES errors?


[re: huwwatkins] [link to this post]
 
In reply to a post by huwwatkins:
Somewhat related to my other issues - Can someone tell me how much of a problem these errors might be and if they are a lot?

CRC:
http://i44.tinypic.com/sq11qx.jpg

ES
http://i42.tinypic.com/r7r8ew.jpg

At the last spike the router gave up and re-synced lower.
Are you seeing any Packet loss , erratic throughput,or very slow throughput, ? downstream more so , could be outside interference, line fault or a problem with the isp's kit at the exchange

Standard User john2007
(legend) Thu 22-Mar-12 00:14:11
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Re: CRC/ES errors?


[re: huwwatkins] [link to this post]
 
You seem to be getting approximately 1500 CRC or superframe errors in a 15 minute period. Say 100 per minute. There are approximately 58 superframes a second or 3480 a minute. So approximately 3% of your downloaded data is corrupt and will be discarded. No problem for the sort of data which can be retransmitted. Probably not so good for viewing a video stream.

Sounds a high number of errors to me.


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Standard User huwwatkins
(member) Thu 22-Mar-12 00:15:47
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Re: CRC/ES errors?


[re: john2007] [link to this post]
 
Might explain the odd lag issues I was having playing Battlefield 3 earlier online!
Standard User john2007
(legend) Thu 22-Mar-12 07:09:14
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Re: CRC/ES errors?


[re: huwwatkins] [link to this post]
 
I must point out that 3% is very much worse case. Perhaps only one of the 10 or so TCP packets within the superframe was corrupted.

You'd probably need to use a tool such as wireshark to examine TCP and UDP packets to get a more accurate picture to gauge if retransmissions were required.
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