That's what I thought. What do you suggest would be a reasonable SNR target margin on a 57 dB line? I suppose my choice is to aim for a 3000 kbps profile or a 2500 kbps profile. I know I can get a stable connection with a 2000 kbps profile, but that's with a 15 dB noise margin, which seems a bit conservative.
Billion 7800N -early thoughts
- Thread starter dmsims
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That's what I thought. What do you suggest would be a reasonable SNR target margin on a 57 dB line? I suppose my choice is to aim for a 3000 kbps profile or a 2500 kbps profile. I know I can get a stable connection with a 2000 kbps profile, but that's with a 15 dB noise margin, which seems a bit conservative.
Soldato
I haven't found anything yet but to re-quote myself:
Cheers!
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Was thinking about sending this router back. But this is just incredible!
Operational Mode G.DMT
Upstream 448
Downstream 7232
SNR Margin(Upstream) 22.0
SNR Margin(Downstream) 1.3
Line Attenuation(Upstream) 22.0
Line Attenuation(Downstream) 49.0
It's been holding that for over an hour!
Operational Mode G.DMT
Upstream 448
Downstream 7232
SNR Margin(Upstream) 22.0
SNR Margin(Downstream) 1.3
Line Attenuation(Upstream) 22.0
Line Attenuation(Downstream) 49.0
It's been holding that for over an hour!
Soldato
That's very low isn't it? Mind you, since tweaking with the snr (65550) I've got back the profile I want, 3mb, but my snr is only 4.5db... stable so far though
Permabanned
Hrm, this does look rather good.
Does anyone know if it can use WAN as primary and the ADSL link as a fallover?
Also if it has the processing power to handle around 30 users worth of traffic?
Does anyone know if it can use WAN as primary and the ADSL link as a fallover?
Also if it has the processing power to handle around 30 users worth of traffic?
I'm afraid not.
I doubt it. It's marketed as a home router. You should probably be looking at something from the likes of Cisco for 30 users.
Is this better?
Apples and oranges !
Interleaving has been turned off
having said that you can go higher (sync)
Do you have a source for saying it cannot do failover
Also the number of users is not really an issue
WAN/LAN bandwidth and usage patterns will provide a much better idea
Yes, I asked the ISP to turn off interleaving.
I'm not sure that I can. I tried a SNR margin of 9 dB, which got me a sync rate of 3,680 kbps (to get me into the 3000 BRAS profile), but I was still seeing a lot of errors.
The user manual states "Only one connection type (EWAN or DSL) is allowed to connect to the internet at one time" (page 11).
Having said that, the web interface allows me to select the WAN interface to be "EWAN", "ADSL" or "Dual WAN". When I select "Dual Wan", the following screen appears.
Maybe this was added in 1.06d? There's nothing about Dual WAN in the release notes.
Soldato
Well thanks to my BT's idiocy (resetting my target SNR training profile during my period of major line issues), following multiple engineer visits and works, multiple fiddles and a new router, my target SNR shot up to 15dB whilst I was on holiday last week 
I've had a word with my ISP and they've restarted the training period. Just before it kicked in I've knocked the SNR tweaks on the head so it's back to basics.
Currently sitting high on a 6dB SNR target profile and 4448Kbps (good for my line syncing at 6.20 in the evening!), I'm expecting this to drop heavily over the training profile following what is probably going to be a pretty unstable few nights, but a 9 or 12dB target profile would be far more tolerable than a 15dB one which virtually halves my connection sync.
Fingers crossed it'll find me some sort of fairly stable medium. Being on a stable 3meg BRAS profile would be awesome for me
I've had a word with my ISP and they've restarted the training period. Just before it kicked in I've knocked the SNR tweaks on the head so it's back to basics.
Currently sitting high on a 6dB SNR target profile and 4448Kbps (good for my line syncing at 6.20 in the evening!), I'm expecting this to drop heavily over the training profile following what is probably going to be a pretty unstable few nights, but a 9 or 12dB target profile would be far more tolerable than a 15dB one which virtually halves my connection sync.
Fingers crossed it'll find me some sort of fairly stable medium. Being on a stable 3meg BRAS profile would be awesome for me
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Doesn't the screenshot I posted refer to failover? It's the only mention of failover I can find anywhere in the web interface, and there's no mention of failover at all in the user manual.
I assume by failover you mean the capability to switch over automatically to a second Internet connection upon the failure of the primary Internet connection (i.e. from EWAN to ADSL or vice versa). Otherwise, I don't know what you mean.
Soldato
I'm not having much luck with this router guys... Had it up and running for nearly a fortnight and I can't quite get it right
I'm after 3mb, and with the snr tweak, I can just about manage it but it doesn't last. I can get it but my snr stays around 4/5db which my connection obviously doesn't like because it will re-sync to a lower profile after a few days. My attenuation is currently 63.5db with this router and it's never been that high before, with any router I've used. It's always been around 56db so I'm thinking that the increase in attenuation is partly responsible for my line not being able to maintain a 3mb sync - something that my 2700hgv didn't break a sweat over
I've asked my isp (ukfns) what my target snr is but they're a bit slow in getting back to me! According to the table on http://www.spaldwick.com/broadband/billion-7800n there are only certain values that you can enter in the snr tweak, but what if your line stats don't apply?
Any ideas?
I'm after 3mb, and with the snr tweak, I can just about manage it but it doesn't last. I can get it but my snr stays around 4/5db which my connection obviously doesn't like because it will re-sync to a lower profile after a few days. My attenuation is currently 63.5db with this router and it's never been that high before, with any router I've used. It's always been around 56db so I'm thinking that the increase in attenuation is partly responsible for my line not being able to maintain a 3mb sync - something that my 2700hgv didn't break a sweat over
I've asked my isp (ukfns) what my target snr is but they're a bit slow in getting back to me! According to the table on http://www.spaldwick.com/broadband/billion-7800n there are only certain values that you can enter in the snr tweak, but what if your line stats don't apply?
Any ideas?
Being able to set your target SNR as a % would be ideal, like you can do on the Netgear DGTeam firmware.
Soldato
Found these values on another forum...
200 = +6dB
150 = +3dB
100 = +0dB
50 = -3dB
25 = -4.5db
1 = -5.5dB
Does this mean that if I were to set my snr value as 200 the router would try and set a snr of 6db?
200 = +6dB
150 = +3dB
100 = +0dB
50 = -3dB
25 = -4.5db
1 = -5.5dB
Does this mean that if I were to set my snr value as 200 the router would try and set a snr of 6db?
Na mate it would add +6db to your current snr margin i believe so if it was say at 7db by setting your snr to 200 you would then get a new sync speed with the noise margin set at 13db which would be lower than your current sync
True - if it worked