Billion 7800N -early thoughts

Ordered yesterday with 3-4 day delivery, arrived this morning at 0830!

Up and running now, any tips for tweaking it please? Had a look at SNR settings, but they just look like gibberish to me, lol!

I'm with Sky broadband, and have the following ADSL stats according to the 7800N :-

DSP Firmware Version - A2pB025f.d22k
DMT Status - No Defect
Operational Mode - ADSL2+
Upstream - 796
Downstream - 13308
SNR Margin(Upstream) - 16.0
SNR Margin(Downstream) - 0.8
Line Attenuation(Upstream) - 15.4
Line Attenuation(Downstream) - 27.5
 
Arrived nice and early, same deal as Broona, but not especially impressed with the performance - Sync speeds/noise margins no better than an 834GT on my long line ADSL MAX.

Weirdly, this one and the 834GT think my attenuation is ~58dB, whilst other routers have it at around 50dB. I'm inclined towards 58 being correct from the actual line distance.
 
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I have seen it said that it doesn't work 'well' out of the box, and that you have to play with the settings first to get the best out of it. Only then will it show it's potential. Sorry, I haven't looked into it enough to tell you which settings!
 
@Zarf

Can you post your full line stats ?

You will not see a sudden increase in sync as standard. What the 7800N offers is stability (for me) and then tweaking.
 
Dont forget to upgrade the firmware to 1.06d i dont think it comes shipped with the latest firmware. Also make sure you download it from the uk billion site not the aussie one :)
 
liamcrane said:
Dont forget to upgrade the firmware to 1.06d i dont think it comes shipped with the latest firmware. Also make sure you download it from the uk billion site not the aussie one :)
Click to expand...

Cheers, I had upgraded it, but with the global version from billion.com rather than uk specific. Not sure what difference it could actually make apart from wifi channels and the default VPI/VCI, but I've put the UK one on now.

I had enabled the PHYR in both directions. Seem to recall that this needs to be supported at the DSLAM though, which I doubt the ancient BT equipment does.

I like the level of SNR customization available, atm i'm sat at around 12dB, 2Mb sync. My line should be able to do better than this though, there's very little variation in the snr when I monitor it with routerstats. Tweaked the snr down to ~4.5dB however and got a 3.5Mb sync but the line wasn't stable, lots of errors and went down every 10 minutes.
For reference, my other routers were stable at around 2.7Mb syncs. Maybe the UK firmware will surprise me though.

I've put in for a DLM reset so will reevaluate once that's had time to go through and settle in.

I noticed the UK 1.06d firmware has IPv6 support, any idea if it can be used as a tunnel endpoint?
 
Hmmmm, looks like I finally got a disconnect at 9dB SNR, 3648Kbps early this morning. Still that's approx 6 days of solid connection at that region with a few disconnects one night. Still a fairly solid improvement.

The unfortunate side is thats obviously the straw that broke the camel's back as I've noticed my SNR target now seems to be 12 :(
I've used the SNR tweak to knock that back down to about 10 for now. I'm on holiday next week so not much point in me doing anything radical atm, but once I get back I might ask Enta/Vivaciti who I go through if they can request my line profile is reset back to 6dB and redo the training period on the basis I've now got a small business class router aimed at stability on longer lines, as quite frankly one disconnect at 9-10dB SNR roughly once a week or so isn't going to cause major issues, but dropping to 12dB SNR will drop me down to the next BRAS profile and lose me 50-60KBps per second. I know it doesnt sound like much but makes a difference when you've got 4-5 users on at once.

I just need to stay on the positive side of 3424! 10-10.5 dB seems to be the sweet spot for that when reconnecting during the day, with 9 going higher but not high enough for the next profile, but reducing stability, whereas 12dB drops me that little bit too far :(

It'd be a lot easier if the profile system was more granular!
 
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sam.wheale said:
What was the 2700hgv like for you mate, any issues?

What sort of difference did it make to your connection?
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The 2700hgv held the connection pretty well, not sure what the exact stats were (due to lack of a decent info screen on the firmware I was using) but it was enough to put me on a 2Mb BT Profile, so probably around 2.7Mb/s.

This was about the same as my 834GT, I'm hoping that the Billion will provide enough of an edge to at least get onto a 2.5Mb/s profile.
 
With regard to BRAS profiles (whose inventor needs shooting)

2272 will get you a 2M profile

2016 kbps to 2240 kbps Up to 1.75 Mbps
2272 kbps to 2816 kbps Up to 2 Mbps
2848 kbps to 3392 kbps Up to 2.5 Mbps
 
Been playing with the 7800n all day today, so I'll just post some stats 7800N V 7700N

Billion 7700N

Line Coding(Trellis): On On
SNR Margin (0.1 dB): 31 230
Attenuation (0.1 dB): 485 300
Output Power (0.1 dBm): 197 119
Attainable Rate (Kbps): 5440 1056

Path 0 Path 1
Downstream Upstream Downstream Upstream
Rate (Kbps): 5408 448 0 0

K (number of bytes in DMT frame): 170 15 0 0
R (number of check bytes in RS code word): 0 0 0 0
S (RS code word size in DMT frame): 0.50 1.00 0.0 0.0
D (interleaver depth): 1 1 0 0
Delay (msec): 0.13 0.25 0.0 0.0
INP (DMT symbol): 0.00 0.00 0.0 0.0

Super Frames: 3980140 3980140 0 0
Super Frame Errors: 30387 0 0 0
RS Words: 0 0 0 0
RS Correctable Errors: 0 0 0 0
RS Uncorrectable Errors: 0 0 0 0

HEC Errors: 277894 0 0 0
OCD Errors: 2 0 0 0
LCD Errors: 2 0 0 0
Total Cells: 132419561 0 0 0
Data Cells: 901692 0 0 0
Bit Errors: 0 0 0 0

Billion 7800n

Parameters DSP Firmware Version A2pB025f.d22k DMT
Status No Defect
Operational Mode G.DMT
Upstream 448
Downstream 4992
SNR Margin(Upstream) 22.0
SNR Margin(Downstream) 3.3
Line Attenuation(Upstream) 26.0
Line Attenuation(Downstream) 55.0



As you can see the 7800N is losing just over 400 kbps and 6.5 db attenuation to the 7700N... dont know why, tested straight after each other , With the Same settings ?
 
dmsims said:
With regard to BRAS profiles (whose inventor needs shooting)

2272 will get you a 2M profile

2016 kbps to 2240 kbps Up to 1.75 Mbps
2272 kbps to 2816 kbps Up to 2 Mbps
2848 kbps to 3392 kbps Up to 2.5 Mbps
Click to expand...

Hi matey, How do these profiles actually work? my downstream connection at the mo is
3296 kbps with a down stream noise margin of 7.2db, sky have me on a 4.6mb profile with a max delay of 8 and i must admit the longest connection time i have had is no longer than 24hrs. My downstream always changes between 3100kbps-3392kbps. Would the 4.6mb profile sky have me on and the max delay of 8 be what is causing my line to drop out all the time every evening? They tell me that the 4.6mb profile is the lowest profile they can give me if i want a max delay of 8 on my line. Line Attenuation is 60.5 on g.dmt
 
I got my modem this afternoon and set it up easily enough. Did a speed test and managed to get over a meg more than I was getting with my netgear modem. I'll post some stats later.

However, I do need some help with setting up my firewall rules/services. I had them all sorted on the netgear but I can't seem to wrap my head round the billion's layout! I'm having a really mad afternoon trying to sort it out and it's doing my head in. Is there an idiots guide somewhere that I can look at? I'm trying to create rules for utorrent/sabnzb on my NAS. Any help appreciated.
 
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