| Author |
Message |
Bert Hyman
Guest
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 Posted:
Sun Jul 03, 2005 4:20 pm Post subject:
Where's the "Far End" of a DSL circuit? |
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My Actiontec GT701 is a bit short on diagnostic and error reporting, but
when I looked at it this AM, I see the error counters are astronomical,
and one of them is climbing rapidly during a file transfer.
I see these counters right now:
Near End CRC Errors (I/F) 575/0
Far End CRC ... 10759/0
Near End RS FEC 39168/0
Far End RS FEC 54469597/0
and the "Far End RS FEC" counter is climbing rapidly (55089354 by the time
I typed in this line) while the others aren't changing at all.
I now see that the "Far End RS FEC" counter continues to climb even when
there's no data traffic.
So, where's the "far end", and what's likely causing the errors?
BTW, I was sold a 7Mb line from Qwest, I'm trained at 6112/896 right now
and file transfer is still running at about 5-6Mb/sec from a capable site.
--
Bert Hyman St. Paul, MN bert@iphouse.com |
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Frankster
Guest
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| Posted:
Mon Jul 04, 2005 4:20 pm Post subject:
Re: Where's the "Far End" of a DSL circuit? |
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| Quote: | Resetting the box caused the error counters to return to their "normal"
behavior, so I still don't know if it's a line problem or a router
problem, or if the problem is on my end or at the CO.
|
If there really is a "problem", I believe it is that the modem is training
at a higher speed than it is capable of delivering without significant
errors. Do you have the latest version of firmware in your Actiontec? Not
that the latest is always the best in this regard, but it is something to
try. I have been through this with the Actiontec before. There is no way to
force it to train at any given speed. It handles the negotiations
automatically during connection. However, different versions of firmware
have different amounts of aggressiveness.
Check your train speed on the WAN Status page. You will probably train at
different speeds occasionally after a restart. I'll bet you find that you
get more errors when trained at the higher speeds.
Having said all that.... the errors are USUALLY on the near end. Far end
errors indicate errors on the carriers end of the connection. On lower speed
connections (like my 1.5M) the carriers end errors are normally almost zero.
But on a high speed connection like yours, I would not be surprised if the
carriers equipment isn't quite up to the task of 7MB either. Remember, this
is specific to your particular C.O., not the carrier overall in all its
locations.
Just my take.
-Frank |
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Frankster
Guest
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| Posted:
Mon Jul 04, 2005 4:20 pm Post subject:
Re: Where's the "Far End" of a DSL circuit? |
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At first I thought you had a problem. Until I read the part about having a
7MB line and getting solid 5-6MB transfers. Considering that, I would
consider these errors "normal". The modem is doing its best on your line to
achieve the highest transfer. You are trained at a speed that is probably
slightly above optimal. But I have found that this is better than below
optimal where you have no chance of ever achieving optimal transfer.
About being "sold a 7MB line". Qwest sells services "up to" certain speeds
(like 7MB). Getting 5-6MB is certainly in line with what you were sold.
There are a lot of factors that determine whether or not your line can
actually achieve 7MB.
They won't even sell me a plan over 1.5M/856K.
-Frank
"Bert Hyman" <bert@iphouse.com> wrote in message
news:Xns96886E37DB0CBVeebleFetzer@216.250.184.7...
| Quote: | My Actiontec GT701 is a bit short on diagnostic and error reporting, but
when I looked at it this AM, I see the error counters are astronomical,
and one of them is climbing rapidly during a file transfer.
I see these counters right now:
Near End CRC Errors (I/F) 575/0
Far End CRC ... 10759/0
Near End RS FEC 39168/0
Far End RS FEC 54469597/0
and the "Far End RS FEC" counter is climbing rapidly (55089354 by the time
I typed in this line) while the others aren't changing at all.
I now see that the "Far End RS FEC" counter continues to climb even when
there's no data traffic.
So, where's the "far end", and what's likely causing the errors?
BTW, I was sold a 7Mb line from Qwest, I'm trained at 6112/896 right now
and file transfer is still running at about 5-6Mb/sec from a capable site.
--
Bert Hyman St. Paul, MN bert@iphouse.com |
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Bert Hyman
Guest
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| Posted:
Mon Jul 04, 2005 4:20 pm Post subject:
Re: Where's the "Far End" of a DSL circuit? |
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In news:kNidneKl2-0f3lTfRVn-qw@giganews.com "Frankster"
<Frank@SPAM2TRASH.com> wrote:
| Quote: | At first I thought you had a problem. Until I read the part about having
a 7MB line and getting solid 5-6MB transfers. Considering that, I would
consider these errors "normal". The modem is doing its best on your line
to achieve the highest transfer. You are trained at a speed that is
probably slightly above optimal. But I have found that this is better
than below optimal where you have no chance of ever achieving optimal
transfer.
|
I agree that my line is ->probably doing as well as it can, but the error
counts aren't normal. While I'll usually see counts in the thousands after
the box has been up for a few a day or so (I usually turn it off overnight
but sometimes forget), counts in the tens-of-millions are unusual.
The fact that the count continued to climb rapidly even when there was no
data traffic was also interesting.
Resetting the box caused the error counters to return to their "normal"
behavior, so I still don't know if it's a line problem or a router
problem, or if the problem is on my end or at the CO.
| Quote: | About being "sold a 7MB line". Qwest sells services "up to" certain
speeds (like 7MB). Getting 5-6MB is certainly in line with what you
were sold. There are a lot of factors that determine whether or not your
line can actually achieve 7MB.
They won't even sell me a plan over 1.5M/856K.
-Frank
"Bert Hyman" <bert@iphouse.com> wrote in message
news:Xns96886E37DB0CBVeebleFetzer@216.250.184.7...
My Actiontec GT701 is a bit short on diagnostic and error reporting,
but when I looked at it this AM, I see the error counters are
astronomical, and one of them is climbing rapidly during a file
transfer.
I see these counters right now:
Near End CRC Errors (I/F) 575/0
Far End CRC ... 10759/0
Near End RS FEC 39168/0
Far End RS FEC 54469597/0
and the "Far End RS FEC" counter is climbing rapidly (55089354 by the
time I typed in this line) while the others aren't changing at all.
I now see that the "Far End RS FEC" counter continues to climb even
when there's no data traffic.
So, where's the "far end", and what's likely causing the errors?
BTW, I was sold a 7Mb line from Qwest, I'm trained at 6112/896 right
now and file transfer is still running at about 5-6Mb/sec from a
capable site.
|
--
Bert Hyman St. Paul, MN bert@iphouse.com |
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Bert Hyman
Guest
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| Posted:
Mon Jul 04, 2005 9:35 pm Post subject:
Re: Where's the "Far End" of a DSL circuit? |
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In news:IoCdndMRftNUyFTfRVn-rw@giganews.com "Frankster"
<Frank@SPAM2TRASH.com> wrote:
| Quote: | Having said all that.... the errors are USUALLY on the near end. Far
end errors indicate errors on the carriers end of the connection.
|
Well, that's what started this whole thing:
Near End CRC Errors (I/F) 575/0
Far End CRC ... 10759/0
Near End RS FEC 39168/0
Far End RS FEC 54469597/0
Far End RS errors in the tens-of-millions and rising.
--
Bert Hyman St. Paul, MN bert@iphouse.com |
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Bob
Guest
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| Posted:
Mon Jul 04, 2005 11:21 pm Post subject:
Re: Where's the "Far End" of a DSL circuit? |
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Bert Hyman wrote:
| Quote: |
So, where's the "far end", and what's likely causing the errors?
|
Bert,
Here's an explanation:
"Near End CRC Errors (I/F), Far End CRC Errors (I/F) - Displays the number
of interleaved (I) and fast path (F) cell errors occurring on the DSL line.
Near
end errors occur on the DSL network side; far end errors originate from the
DSL modem. These numbers can be used to diagnose network problems, such
as slow response times."
I've wondered what they mean as well, since I have a couple of clients and
friends using the Actiontec. I found the explanation here:
https://www.zhonka.net/files/user-manual.pdf
It appears to be an older version of the Actiontec wireless DSL modem; the
version up on Qwest's site doesn't have the info in it anymore.
Now I need to track down what Local and Remote counters really mean on my
Cisco 678. I'm getting the feeling I should think of it from the phone
company's perspective, where Local is the central office, and Remote is my
modem.
Hope this helps,
Bob. |
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Frankster
Guest
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| Posted:
Tue Jul 05, 2005 12:20 am Post subject:
Re: Where's the "Far End" of a DSL circuit? |
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| Quote: | Near End CRC Errors (I/F) 575/0
Far End CRC ... 10759/0
Near End RS FEC 39168/0
Far End RS FEC 54469597/0
Far End RS errors in the tens-of-millions and rising.
|
Still, the connect time will matter. This many errors in 1 hour is a lot
different than this many errors in 6 months.
Also, I have read that Actiontec modems had a problem where they quadrupled
the number of errors (or maybe times 10, I can't remember). Some SW upgrade
was meant to fix that. Don't know if it did.
-Frank |
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