New Zyxel Router Disconnections and Sync Speed
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- Re: New Zyxel Router Disconnections and Sync Speed
New Zyxel Router Disconnections and Sync Speed
24-03-2011 12:46 AM
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It appears that both routers use the TI AR7 chipset yet the 3Com suffered from less disconnections and managed to achieve a higher data throughput than the Zyxel (up to 2200kbps vs 1800kbps via the BBC iPlayer diagnostics page).
My router displays the following information.
ras> wan adsl perfdata
near-end FEC error fast: 0
near-end FEC error interleaved:22230
near-end CRC error fast: 0
near-end CRC error interleaved: 333
near-end HEC error fast: 0
near-end HEC error interleaved: 0
far-end FEC error fast: 0
far-end FEC error interleaved:2856
far-end CRC error fast: 0
far-end CRC error interleaved: 12
far-end HEC error fast: 0
far-end HEC error interleaved: 0
ras> wan adsl version
ADSL Chipset Vendor: TI AR7 07.02.03.00
ras> wan adsl chandata
DSL standard: ADSL_G.dmt
near-end interleaved channel bit rate: 2336 kbps
near-end fast channel bit rate: 0 kbps
far-end interleaved channel bit rate: 448 kbps
far-end fast channel bit rate: 0 kbps
ras> wan adsl coinfo
ATUC Information
country code:15 0
vender:ALCB
ras> wan adsl targetnoise
Current target noise margin value:0
ras> wan adsl linedata far
noise margin upstream: 13 db
output power downstream: 16 db
attenuation upstream: 31 db
ras> wan adsl linedata near
noise margin downstream: 9 db
output power upstream: 11 db
attenuation downstream: 55 db
According to one calculator I found online, my connection speed should be around 2550Kbps for ADSL and if using ADSL2+ 2350Kbps to 4250Kbps. Regardless of the calculator, the ADSL connection is not performing as it was with the old router.
Can anyone offer an opinion based on the above data?
Re: New Zyxel Router Disconnections and Sync Speed
24-03-2011 2:11 AM
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So the key to this is probably to establish why the Zyxel disconnected more frequently. Is it still doing that even with the reduced sync speed? Does noise margin vary markedly between daytime and night-time periods?
Re: New Zyxel Router Disconnections and Sync Speed
24-03-2011 9:23 AM
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With regard to noise margin, I am not at home during the day Monday to Friday and hence would need to look at the weekend. If I'm up late one night I could look at the logs but currently I'm restricted to evenings and weekends. Is there any particular time at the weekend that it is worth checking the router stats (i.e. a particularly quiet time)?
Re: New Zyxel Router Disconnections and Sync Speed
24-03-2011 11:55 AM
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Should this feature be enabled or disabled? A quick search appears to show that this could help combat the target noise margin issue. Is this correct, should I enable it if it isn't already?
Re: New Zyxel Router Disconnections and Sync Speed
24-03-2011 1:52 PM
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For checking noise margin variation between day and night, all that is required if to record the value a couple of times during daylight (say 10am to 2pm) and similarly after dark when atmospheric conditions, street lights, CH, and other equipment in the home are likely to be generating RF noise at ADSL tone frequencies.
Re: New Zyxel Router Disconnections and Sync Speed
25-03-2011 9:14 AM
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Is it possible to reset the target noise margin to so that I can see if the issue re-occurs?
From what I've read, it may take a while for the target noise margin to decrease if the later firmware cures the problem.
Re: New Zyxel Router Disconnections and Sync Speed
25-03-2011 2:11 PM
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Do the recent number of disconnections look reasonable or excessive?
Re: New Zyxel Router Disconnections and Sync Speed
25-03-2011 7:09 PM
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Re: New Zyxel Router Disconnections and Sync Speed
25-03-2011 9:38 PM
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I certainly think you should raise a fault and have it investigated properly by the faults team.
Jojo
Re: New Zyxel Router Disconnections and Sync Speed
26-03-2011 2:09 PM
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Apart from that (admittedly not trivial) problem I thought the ZyXEL was a pretty good router.
Graham
Re: New Zyxel Router Disconnections and Sync Speed
28-03-2011 9:02 AM
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grahamt - Thanks for the input regarding your experience with Zyxel routers. It appears this sort of behaviour is not uncommon with Zyxel routers although in my case it does appear that there are more disconnections than normal even for a Zyxel router. I know that the connection can be stable with a TI AR7 chipset, therefore my suspicion is that the firmware or other hardware in the router is the culprit.
I have read references to no DLM/static target noise margins, is this an option that could be considered here?
Re: New Zyxel Router Disconnections and Sync Speed
28-03-2011 1:11 PM
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The viable solution has to be to replace the router with one that doesn't have this problem. Anything else is an attempt to paper over the cracks.
Re: New Zyxel Router Disconnections and Sync Speed
29-03-2011 9:38 AM
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Re: New Zyxel Router Disconnections and Sync Speed
02-04-2011 11:09 PM
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I experience the following:
- Low level constant background "static".
- Intermittent higher levels of static.
Should the line be completely quiet? What is likely to be causing the noise, is it a line problem or interference?
Re: New Zyxel Router Disconnections and Sync Speed
03-04-2011 1:45 AM
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When your router is plugged in do you notice significant variation of noise margin second-by-second, especially during the daytime?
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