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Administrator MrSaffron
(staff) Tue 23-Aug-11 12:57:10
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Re: ADSL speed dropped below 1mbit


[re: keymoo] [link to this post]
 
Time to reboot the router then, to try and get some of your sync speed back

Andrew Ferguson, andrew@thinkbroadband.com
www.thinkbroadband.com - formerly known as ADSLguide.org.uk
The author of the above post is a thinkbroadband staff member. It may not constitute an official statement on behalf of thinkbroadband.
Standard User keymoo
(newbie) Wed 24-Aug-11 07:40:44
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Re: ADSL speed dropped below 1mbit


[re: MrSaffron] [link to this post]
 
I will probably wait another day or two, request a noise reset and then reboot - does that sound sensible? Here's my stats today:

http://postimage.org/image/28k9m5yxw/
Standard User keymoo
(newbie) Thu 25-Aug-11 11:20:47
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Re: ADSL speed dropped below 1mbit


[re: MrSaffron] [link to this post]
 
My ISP has just told me a line reset will be done in the next 24 hours.

I have requested the line reset and this should be completed within the next 24 hours. Please be aware that this will place your line back into its 10 day training period. Please do not restart the router during this time for best results.


When should I reboot the router to get it to sync at a higher speed? Above, they are telling me not to reboot it. If I don't reboot it then the speed won't go up. Confused.


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Standard User keymoo
(newbie) Thu 25-Aug-11 12:32:53
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Re: ADSL speed dropped below 1mbit


[re: MrSaffron] [link to this post]
 
I asked my ISP when I should reboot my router to get it to resync at a higher speed and I got this back:

As I said, please do not reboot the router, it will retrain itself.
Rebooting the router does not improve the speed.


Is that true? Doesn't sound right to me.
Standard User shtu
(experienced) Thu 25-Aug-11 14:01:34
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Re: ADSL speed dropped below 1mbit


[re: keymoo] [link to this post]
 
Sort-of-right.

If left along long enough, the DLM will reset the target noise margin itself and this triggers a resync. Can take weeks though, and sometimes doesn't happen as it should.

*If* the target margin has reset, but the resync hasn't happened, a reboot\resync will work. Note the "if".
Standard User keymoo
(newbie) Thu 25-Aug-11 14:32:11
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Re: ADSL speed dropped below 1mbit


[re: shtu] [link to this post]
 
OK, so if you were in my position when would you reboot the router? The speed at the moment is almost unusable and if a reboot will "fix" it then I'm happy to do that. I can't afford to wait weeks for it to reset itself. With that said should I wait 24 hours as the ISP said, to ensure that the line reset has happened? Would the noise margin drop down again? It's at 12.5 right now. Not sure what to do.
Standard User shtu
(experienced) Fri 26-Aug-11 13:28:49
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Re: ADSL speed dropped below 1mbit


[re: keymoo] [link to this post]
 
Well, they claim that the reset should happen today (Fri), so leave it until tomorrow morning.

This is, of course, assuming that they actually do what they say they will...
Standard User keymoo
(newbie) Fri 26-Aug-11 16:06:20
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Re: ADSL speed dropped below 1mbit


[re: shtu] [link to this post]
 
Thanks, well something seems to have happened today. The connection speed went from 416 to 512 and then to 352 and has stayed at 352 for the last six hours or so. I also notice that the WAN port "Up Time" got reset at about 7am this morning. The router has not been rebooted yet. Here are the stats now at the time of this post:

http://postimage.org/image/1x945zves/

Should I expect the speed to start gradually increasing without a reboot? The noise margin still looks high to me, what do you think?
Standard User shtu
(experienced) Fri 26-Aug-11 16:44:41
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Re: ADSL speed dropped below 1mbit


[re: keymoo] [link to this post]
 
I think you need to try and

Keep track of the uptime - that's resynced this morning = not stable, so noise margin will not reduce.

Try and get more stats out of that router, particularly about errors on the line.
Standard User keymoo
(newbie) Sat 27-Aug-11 09:51:29
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Re: ADSL speed dropped below 1mbit


[re: shtu] [link to this post]
 
I have a Netgear DG834Gv4 and I have just telnet into the router and run this command:

adslctl info --stats

and got this:

BusyBox v1.00 (2009.06.09-07:57+0000) Built-in shell (ash)
Enter 'help' for a list of built-in commands.

# adslctl info --stats
adslctl: ADSL driver and PHY status
Status: ShowtimeRetrain Reason: 1
Channel: INTR, Upstream rate = 448 Kbps, Downstream rate = 352 Kbps
Link Power State: L0
Mode: G.DMT
Channel: Interleave
Trellis: ON
Line Status: No Defect
Training Status: Showtime
Down Up
SNR (dB): 12.4 18.0
Attn(dB): 58.0 29.0
Pwr(dBm): 14.3 12.1
Max(Kbps): 512 996
Rate (Kbps): 352 448
G.dmt framing
K: 12(0) 15
R: 16 16
S: 8 8
D: 4 4
ADSL2 framing
MSGc: 1 1
B: 15 15
M: 8 8
T: 1 1
R: 16 16
S: 9.0000 9.0000
L: 128 128
D: 4 4
Counters
SF: 5033052 5033004
SFErr: 0 97
RS: 42780950 42780534
RSCorr: 9907523 294
RSUnCorr: 0 0

HEC: 0 67
OCD: 0 0
LCD: 0 0
Total Cells: 71032334 0
Data Cells: 8155497 0
Drop Cells: 0
Bit Errors: 0 0

ES: 22452 0
SES: 19301 0
UAS: 412 0
AS: 85562

INP: 2.00 2.00
PER: 1.96 1.96
delay: 9.00 9.00
OR: 28.44 28.44

Bitswap: 0 0

Total time = 1 days 22 hours 40 min 40 sec
SF = 23669594
CRC = 11082
LOS = 31
LOF = 279
ES = 22452
Latest 1 day time = 22 hours 40 min 40 sec
SF = 4802364
CRC = 0
LOS = 0
LOF = 0
ES = 0
Latest 15 minutes time = 10 min 40 sec
SF = 37642
CRC = 0
LOS = 0
LOF = 0
ES = 0
Previous 15 minutes time = 15 min 0 sec
SF = 52982
CRC = 0
LOS = 0
LOF = 0
ES = 0
Previous 1 day time = 24 hours 0 sec
SF = 3621632
CRC = 11082
LOS = 31
LOF = 279
ES = 22452
15 minutes interval [-30 min to -15 min] time = 15 min 0 sec
SF = 52923
CRC = 0
LOS = 0
LOF = 0
ES = 0
15 minutes interval [-45 min to -30 min] time = 15 min 0 sec
SF = 52923
CRC = 0
LOS = 0
LOF = 0
ES = 0
15 minutes interval [-60 min to -45 min] time = 15 min 0 sec
SF = 52923
CRC = 0
LOS = 0
LOF = 0
ES = 0
Showtime Drop Reason: 1
Last Retrain Reason: 1

I'm wondering if I should plug the router in directly to the master test socket with no filter just to eliminate the filter as a potential problem. What do you think?
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