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Acceptable Post-RS levels
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Old 07-07-2017, 17:49   #1
Travelstar
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Acceptable Post-RS levels

Anyone here got a view on what is acceptable from a post-RS errors count view?

Looking at my SH3, I'm seeing low hundreds over the course of several days.
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Old 07-07-2017, 20:55   #2
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Re: Acceptable Post-RS levels

How are you measuring them? I thought the Hub 3.0 didn't report that information.
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Old 07-07-2017, 22:54   #3
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Re: Acceptable Post-RS levels

Pre:

http://192.168.100.1/walk?oids=1.3.6....127.1.1.4.1.3

Post:

http://192.168.100.1/walk?oids=1.3.6....127.1.1.4.1.4

Obviously the above is modem mode. Adjust IP address if using as a firewall.
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Old 07-07-2017, 22:59   #4
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Re: Acceptable Post-RS levels

...and how do you refresh the counts so you can get a good idea of the growth rate?
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Old 07-07-2017, 23:16   #5
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Re: Acceptable Post-RS levels

Visit the page over a period of time and watch the counts change. Simples!
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Old 08-07-2017, 00:41   #6
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Re: Acceptable Post-RS levels

Is your service being affected? If not then don't worry about it!
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Old 08-07-2017, 10:51   #7
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Re: Acceptable Post-RS levels

There is no set figure
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Old 08-07-2017, 13:21   #8
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Re: Acceptable Post-RS levels

Quote:
Originally Posted by vm_tech View Post
Is your service being affected? If not then don't worry about it!

It has at certain points so yes. Downloads in particular can get corrupted.
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Old 09-07-2017, 11:20   #9
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Re: Acceptable Post-RS levels

Quote:
Originally Posted by Travelstar View Post
It has at certain points so yes. Downloads in particular can get corrupted.
Post-RS errors won't cause corrupted downloads, assuming you're using a transport protocol such as TCP, which you almost certainly are. The receiving end drops any packets that have post-RS errors, and waits/asks for them to be retransmitted. So the post-RS error doesn't corrupt your data; it just slows down the overall download by a tiny amount.
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Old 09-07-2017, 11:26   #10
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Re: Acceptable Post-RS levels

You took the words out of my mouth spider. The errors are on the RF side of things. Also how the modems read them are slightly different, as that counter could be a few errors over a long period of time. How i see it with my tester in the field is different, if you get the odd blip now and again, you probably won't notice. But if it's a constant stream, you will
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Old 09-07-2017, 11:44   #11
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Re: Acceptable Post-RS levels

Quote:
Originally Posted by vm_tech View Post
You took the words out of my mouth spider. The errors are on the RF side of things. Also how the modems read them are slightly different, as that counter could be a few errors over a long period of time. How i see it with my tester in the field is different, if you get the odd blip now and again, you probably won't notice. But if it's a constant stream, you will
No - I have actually had some corrupted downloads. I've had to do a few Linux installs lately and the MD5 checks have come back bad on a few occasions. In all the cases, the download had stopped partially and was restarted.
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Old 09-07-2017, 13:23   #12
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Re: Acceptable Post-RS levels

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Originally Posted by Travelstar View Post
In all the cases, the download had stopped partially and was restarted.
Post-RS errors won't cause the download to stop unless you have a crazy number of them, which you don't.
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Old 09-07-2017, 13:47   #13
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Re: Acceptable Post-RS levels

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Originally Posted by spiderplant View Post
Post-RS errors won't cause the download to stop unless you have a crazy number of them, which you don't.
Agreed in principle however this is not the first time I've done a few big downloads and MD5s have not returned as expected. It's also not just from one source so quite surprised. I'm more surprised that use of MD5s is not as prevelabt as I would have liked as it's the quickest way to verify a download.

It might be time for me to do a little more testing with large downloads and try and replicate more, however surprised it's happened so many times.

---------- Post added at 12:47 ---------- Previous post was at 12:43 ----------

I've checked my networking equipment and no CRC errors are showing, so it's definitely upstream.
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Old 09-07-2017, 14:47   #14
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Re: Acceptable Post-RS levels

Quote:
Originally Posted by Travelstar View Post
Agreed in principle however this is not the first time I've done a few big downloads and MD5s have not returned as expected.
I'm not saying you don't have a problem, but your problem is not post-RS errors.

Quote:
Originally Posted by Travelstar View Post
I've checked my networking equipment and no CRC errors are showing, so it's definitely upstream.
Post-RS errors reported by your modem are downstream. If the upstream gets corrupted, the CMTS would see the errors, not your modem. It's always the receiving end that detects RS errors.
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Old 09-07-2017, 16:12   #15
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Re: Acceptable Post-RS levels

Quote:
Originally Posted by spiderplant View Post
I'm not saying you don't have a problem, but your problem is not post-RS errors.


Post-RS errors reported by your modem are downstream. If the upstream gets corrupted, the CMTS would see the errors, not your modem. It's always the receiving end that detects RS errors.
I'm referring upstream from my PC. I know the difference between upstream and downstream.
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