Do I have a Problem With My Line Errors?

Can somebody tell me if there is something unusual about my CRC, FEC
and/or HEC errors from my stats below? I think the errors look od
because I only have up errors and the FEC errors look high?

BT tell me that I am 6.5km from the exchange so I think that m
attenuation is about right? although it does change, and the tw
figures below represent the upper and lower limits.

I want to be sure that I have the best chance of a reliable service an
would welcome any advice about whether I could do anything to mak
things better. Like change the router? or my ISP? (I am wit
TalkTalk). I have an ASDL Nation faceplate and there is very littl
difference in the stats between having it on or connecting directly t
the test socket with an in-line filter. By the way I do lose the DS
signal regularly and when I do it seems to happen 3 or 4 times over
ten-minute period.

My Sample Stats (two given) a

Data Path: ----------------- Interleaved
Standard: ------------------ RE-ADSL2
Product Name: ------------- SmartAX MT882
System Up Time: -------------- 393:09:59 ----- 715:52:05
DSL Up Time: ------------------- 05:05:53 ------- 09:26:39
Bandwidth Down/Up(kbps): -- 495/89 -------- 458/109
SNR Margin Down/Up(dB): --- 17.0/17.5 ------ 18.5/17.0
Attenuation Down/Up(dB): --- 62.5/38.5 ------ 56.5/38.0
CRC Down/Up: ------------------- 0/188 ----------- 0/32
FEC Down/up: ------------------- 0/1215 ---------- 0/21644
HEC Down/up: ------------------- 0/359 ----------- 0/51

I would be really grateful for some help interpreting these figures an
suggestions about how I might improve them


--
Twyford_Keith


Twyford_Keith

"Twyford_Keith" <(E-Mail Removed)> wrote in
message news:(E-Mail Removed)...
>
> Can somebody tell me if there is something unusual about my CRC, FEC,
> and/or HEC errors from my stats below? I think the errors look odd
> because I only have up errors and the FEC errors look high?
>
> BT tell me that I am 6.5km from the exchange so I think that my
> attenuation is about right? although it does change, and the two
> figures below represent the upper and lower limits.
>
> I want to be sure that I have the best chance of a reliable service and
> would welcome any advice about whether I could do anything to make
> things better. Like change the router? or my ISP? (I am with
> TalkTalk). I have an ASDL Nation faceplate and there is very little
> difference in the stats between having it on or connecting directly to
> the test socket with an in-line filter. By the way I do lose the DSL
> signal regularly and when I do it seems to happen 3 or 4 times over a
> ten-minute period.
>
> My Sample Stats (two given) a
>
> Data Path: ----------------- Interleaved
> Standard: ------------------ RE-ADSL2
> Product Name: ------------- SmartAX MT882
> System Up Time: -------------- 393:09:59 ----- 715:52:05
> DSL Up Time: ------------------- 05:05:53 ------- 09:26:39
> Bandwidth Down/Up(kbps): -- 495/89 -------- 458/109
> SNR Margin Down/Up(dB): --- 17.0/17.5 ------ 18.5/17.0
> Attenuation Down/Up(dB): --- 62.5/38.5 ------ 56.5/38.0
> CRC Down/Up: ------------------- 0/188 ----------- 0/32
> FEC Down/up: ------------------- 0/1215 ---------- 0/21644
> HEC Down/up: ------------------- 0/359 ----------- 0/51
>
> I would be really grateful for some help interpreting these figures and
> suggestions about how I might improve them.
>
>
>

Keith,
they look a bit odd, but I'm afraid I don't have a magic wand to fix
things .
Why do you get lots of errors up, but none down? Mine are the other way
round. Are you submitting lots of photos or are you acting as a
distribution hub for music, phone traffic etc?
Your attenuation down is probably right for that distance (note that my
63.5dB is the max which can be reported - it is possibly higher) but your
downstream SNR margin (signal above noise level) is very generous. The
system should be learning from that, and bumping up your bandwidth until SNR
drops to around 6dB. Maybe those high up errors are the issue.
lternatively your BRAS profile may be 'stuck'.
What is voice quality like with the plain old phone? Lots of noise? Do
people you call complain of noise? If so then it might be worth reporting
a PHONE problem.

For comparison, I'm a claimed 8.6Km from the exchange and these figures
below are typical with my Home Hub
which is not the most consistent thing for reporting (uptimes vary depending
on which screen you are accessing). A few ADSL losses in a week is pretty
normal.

Uptime: 4 days, 10:31:15

Modulation: G.992.1 annex A

Bandwidth (Up/Down) [kbps/kbps]: 320 / 512

Data Transferred (Sent/Received) [MB/MB]: 12.00 / 44.86

Output Power (Up/Down) [dBm]: 12.0 / 14.0

Line Attenuation (Up/Down) [dB]: 31.5 / 63.5

SN Margin (Up/Down) [dB]: 6.0 / 5.0

Vendor ID (Local/Remote): TMMB / P

Loss of Framing (Local/Remote): 0 / 0

Loss of Signal (Local/Remote): 0 / 0

Loss of Power (Local/Remote): 0 / 0

Loss of Link (Remote): 0

Error Seconds (Local/Remote): 0 / 0

FEC Errors (Up/Down): 0 / 58,312

CRC Errors (Up/Down): 0 / 608

HEC Errors (Up/Down): 0 / 426

Phil B;238929 Wrote:[color=blue]
> "Twyford_Keith" (E-Mail Removed) wrote in
> messag
> news:(E-Mail Removed)...[i]
>
> Why do you get lots of errors up, but none down? Mine are the othe
> way
> round. Are you submitting lots of photos or are you acting as a
> distribution hub for music, phone traffic etc?
>
> Your attenuation down is probably right for that distance (note that m
>
> 63.5dB is the max which can be reported - it is possibly higher) bu
> your
> downstream SNR margin (signal above noise level) is very generous. Th
>
> system should be learning from that, and bumping up your bandwidt
> until SNR drops to around 6dB. Maybe those high up errors are th
> issue.
> alternatively your BRAS profile may be 'stuck'.
>
> What is voice quality like with the plain old phone? Lots of noise?
> Do
> people you call complain of noise? If so then it might be wort
> reporting
> a PHONE problem.

Phil,
Thanks for your response and the copy of your stats. It is strang
that I only have up errors whereas your stats, and most of the others
have seen, have only down errors. I wonder whether my router i
reporting errors the wrong way around.
I am not submitting lots of photos or acting as a distribution hub, no
do I have any phone line quality problems. Maybe my connection i
normal and OK for such a long line? The only real problem I have wit
my connection is that I lose synch regularly. I connect for maybe 5 t
10 hours then have a series of dropped connections. This is normally i
I have not used the connection for a while, however, I have never lost
connection during a big download. Therefore, I am wondering if my IS
(TalkTalk) is cutting the connection after an idle period for som
reason. I am also wondering if changing the modem might offer hope fo
improvement.
The reason for my good SNR Margin figures is that my BRAS profile i
set to 15dB to give me reliability. It was set at 6dB for a while an
my speed was higher but reliability was poor. I notice from you
figures that your connection has been up for over 4 days yet you have
low SNR Margin and high attenuation so I imagine that despite the lengt
of your line it is actually very stable.
I also notice from your stats that your up speed is two-thirds of you
down speed. My limited experience and understanding of ADSL is that
would expect a down speed of about five times the up speed. What d
you think? and do you have any thoughts on whether a change o
modem/router might improve my connection times, and maybe reduce m
errors


--
Twyford_Keith

"Twyford_Keith" <(E-Mail Removed)> wrote in
message news:(E-Mail Removed)...[color=blue]
>
> Phil B;238929 Wrote:
>> "Twyford_Keith" (E-Mail Removed) wrote in
>> message
>> news:(E-Mail Removed)...[i]
>>
>> Why do you get lots of errors up, but none down? Mine are the other
>> way
>> round. Are you submitting lots of photos or are you acting as a
>> distribution hub for music, phone traffic etc?
>>
>> Your attenuation down is probably right for that distance (note that my
>>
>> 63.5dB is the max which can be reported - it is possibly higher) but
>> your
>> downstream SNR margin (signal above noise level) is very generous. The
>>
>> system should be learning from that, and bumping up your bandwidth
>> until SNR drops to around 6dB. Maybe those high up errors are the
>> issue.
>> alternatively your BRAS profile may be 'stuck'.
>>
>> What is voice quality like with the plain old phone? Lots of noise?
>> Do
>> people you call complain of noise? If so then it might be worth
>> reporting
>> a PHONE problem.
>
> Phil,
> Thanks for your response and the copy of your stats. It is strange
> that I only have up errors whereas your stats, and most of the others I
> have seen, have only down errors. I wonder whether my router is
> reporting errors the wrong way around.
> I am not submitting lots of photos or acting as a distribution hub, nor
> do I have any phone line quality problems. Maybe my connection is
> normal and OK for such a long line? The only real problem I have with
> my connection is that I lose synch regularly. I connect for maybe 5 to
> 10 hours then have a series of dropped connections. This is normally if
> I have not used the connection for a while, however, I have never lost a
> connection during a big download. Therefore, I am wondering if my ISP
> (TalkTalk) is cutting the connection after an idle period for some
> reason. I am also wondering if changing the modem might offer hope for
> improvement.
> The reason for my good SNR Margin figures is that my BRAS profile is
> set to 15dB to give me reliability. It was set at 6dB for a while and
> my speed was higher but reliability was poor. I notice from your
> figures that your connection has been up for over 4 days yet you have a
> low SNR Margin and high attenuation so I imagine that despite the length
> of your line it is actually very stable.
> I also notice from your stats that your up speed is two-thirds of your
> down speed. My limited experience and understanding of ADSL is that I
> would expect a down speed of about five times the up speed. What do
> you think? and do you have any thoughts on whether a change of
> modem/router might improve my connection times, and maybe reduce my
> errors?
>
>
Hi Keith,
sorry to be so long coming back. Lots of visitors!

Well, my line is not very typical. I think that the lower frequencies are
used for the 'up' connection whilst the higher ones for the 'down'. The
higher ones get more easily lost on long lines so my down/up ratio will not
be very high compared with those on shorter lines.
As for my line stability I've no real way of telling from router stats. I
have read that the ADSL spec only allows attenuation reporting with a limit
of 63.5 - anything over that still gets reported as 63.5. My snr stays
between 4.5 and 7dB but speed is another matter.
My first HH synched at speeds 576 to 720K but it failed with a bad ether
port. The replacement stuck like a limpet to 544K for months but now sticks
at 512 with the occasional 480K. Up speed though seems to have taken a bad
turn - often 288K but it is developing a pattern of slowly dropping to 64K
when nothing works happily. Reboot and it pops up again. It seemed to
coincide with the introduction of new profile mechanisms, but I don't have
enough evidence to point a finger.

As for whether your stats are wrong way round, why not post a query - quote
the router and software version and ask others.

For long lines I've heard good reports of Netgear DG836GT with latest
software (older software was not good), Thompson 585 v6 and Zyxel 660. Why
not lurk in the forums on http://www.thinkbroadband.com/ ?

Regards
Phil









..

>
> --
> Twyford_Keith