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Standard User diputs36
(newbie) Mon 02-Apr-12 14:43:04
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Maybe a fresh router?


[link to this post]
 
For my position I have a good ADSL2+ connection and BT has set my margin to 3.5dB which means I sync 8700-9100kb/s with 4.65 dB attenuation. However most evenings /nights the connection will drop and reconnect @ ~1000kb/s less with a margin of 4-4.5dB.

Present router is Thompson TG 585 v7 8.2.3.5 supplied by ISP.

Can you recommend options that either will maintain the higher sync or a rate higher than the lower, whether that is by tweaking or otherwise?

My router details are below, the first at higher sync, the second at lower.



Link Information
Uptime: 0 days, 1:18:18
DSL Type: G.992.5 annex A
Bandwidth (Up/Down) [kbps/kbps]: 440 / 8,784
Output Power (Up/Down) [dBm]: 12.5 / 0.0
Line Attenuation (Up/Down) [dB]: 25.5 / 46.5
SN Margin (Up/Down) [dB]: 20.0 / 3.5
Vendor ID (Local/Remote): TMMB / IFTN
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 / 14,348
CRC Errors (Up/Down): 0 / 8
HEC Errors (Up/Down): 0 / 4

Link Information
Uptime: 3 days, 13:44:09
DSL Type: G.992.5 annex A
Bandwidth (Up/Down) [kbps/kbps]: 440 / 7,818
Output Power (Up/Down) [dBm]: 12.5 / 0.0
Line Attenuation (Up/Down) [dB]: 25.5 / 46.5
SN Margin (Up/Down) [dB]: 9.5 / 4.5
Vendor ID (Local/Remote): TMMB / IFTN
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): 14 / 0
FEC Errors (Up/Down): NA / 15,705,129
CRC Errors (Up/Down): NA / 750
HEC Errors (Up/Down): 0 / 647
Standard User XRaySpeX
(eat-sleep-adslguide) Mon 02-Apr-12 15:13:09
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Re: Maybe a fresh router?


[re: diputs36] [link to this post]
 
Your speeds are already better than expected.

You either:
  • Have highest speeds and risk instability and discons. as you are getting, with a low Target NM of 3.5 dB, or
  • Sacrifice some speed for more stability, by raising your Target NM to 6dB or more.
As you are already getting discons with the low NM, I would recommend getting your Target raised.

1999: Freeserve 48K Dial-Up => 2005: Wanadoo 1 Meg BB => 2007: Orange 2 Meg BB => 2008: Orange 8 Meg LLU => 2010: Orange 16 Meg LLU => 2011: Orange 19 Meg WBC
Standard User diputs36
(newbie) Mon 02-Apr-12 18:36:08
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Re: Maybe a fresh router?


[re: XRaySpeX] [link to this post]
 
I think I'd lose more than now were the margin to go to 6dB. Surely it can hardly be called proper instability to have a once a day at most resync.

How does the 585 rank in the holding at low margins fare against other routers?
Are there better?


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Standard User baby_frogmella
(committed) Tue 03-Apr-12 07:19:37
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Re: Maybe a fresh router?


[re: diputs36] [link to this post]
 
In reply to a post by diputs36:
Can you recommend options that either will maintain the higher sync or a rate higher than the lower, whether that is by tweaking or otherwise?


Yes, go for a Billion 7800N router which should have no problem hanging onto a line with 3-4db noisemargin. Its arguably the best router out there. You could always return it back to Amazon for a refund if you're not happy, but pretty sure you won't. Also it lets you tweak your noise margin for speed/stability smile
http://www.amazon.co.uk/Billion-BiPAC-7800N-Broadban...

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Standard User b4dger
(knowledge is power) Tue 03-Apr-12 08:40:48
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Re: Maybe a fresh router?


[re: diputs36] [link to this post]
 
You can only push a line so far so perhaps at your attenuation you're asking a bit much.

I would suggest getting your ISP to change your TSNRM to 6db. You can then see if this then runs stable and/or if you actually notice the reduced sync in everyday use.

I swear by my ST585v6 - if you want to try one of these then at least you can pick one up very cheaply (around £15) on eBay to give it a go.

But it looks like 3.5db is too low for a TSNRM on your line...

Standard User diputs36
(newbie) Tue 03-Apr-12 08:59:11
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Re: Maybe a fresh router?


[re: baby_frogmella] [link to this post]
 
Any views on the 7700N which is somewhat cheaoer?
Standard User baby_frogmella
(committed) Tue 03-Apr-12 18:09:05
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Re: Maybe a fresh router?


[re: diputs36] [link to this post]
 
In reply to a post by diputs36:
Any views on the 7700N which is somewhat cheaoer?


The 7700N is a budget version of the 7800N and while i wouldn't say its poor, the 7800N is far superior. The 7800N uses a more powerful chipset broadcom 6358, whilst the 7700N uses 6328. The 7800N has more RAM, has better wifi range, gigabit ports and SNR can be tweaked through the web page whereas you need to faff around with telnet commands to tweak the snr on the 7700N and unlike the 7800N, you lose the tweaked SNR on the 7700N every time the router is rebooted. If you can afford it, id strongly recommend going for the 7800N (have a look at the amazon reviews), however if its way out of your budget, then the 7700N is a good cheaper alternative.

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Standard User diputs36
(newbie) Tue 03-Apr-12 18:48:56
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Re: Maybe a fresh router?


[re: baby_frogmella] [link to this post]
 
Thanks for tips! BTW What chip version does my existing router have in it? TG 585 v7
Standard User epyon
(committed) Tue 03-Apr-12 19:32:30
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Re: Maybe a fresh router?


[re: diputs36] [link to this post]
 
broadcom also you should get your upstream uncapped.

My Broadband Speed Test
Standard User DrTeeth
(knowledge is power) Tue 03-Apr-12 20:39:56
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Re: Maybe a fresh router?


[re: diputs36] [link to this post]
 
For maximum stability, you need to tweak your SNRM at night. It would be better for you if you bought a router that allowed you to self-tweak it.

DrT

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