[Snap] OFFICIAL: Snaps VDSL2 Promo is up!

Forums › 2degrees (including Slingshot, Orcon, Flip, Stuff Fibre, MyRepublic, 2talk and Vocus) › [Snap] OFFICIAL: Snaps VDSL2 Promo is up!

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Networkn
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#651165 5-Jul-2012 11:00

What is the cable loss number used for NZ? It defaults to 13.81 but I know my DS Attentuation is 2dB which calculates my connection at 90 but it's 70.

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SamF

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#651168 5-Jul-2012 11:03

I believe that 13.81 is correct.

mercutio

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#651297 5-Jul-2012 13:53

networkn: What is the cable loss number used for NZ? It defaults to 13.81 but I know my DS Attentuation is 2dB which calculates my connection at 90 but it's 70.

chorus use higher snr margins than other countries typically do. it's actually impossible to sync at 24 megabit in nz on non-llu adsl (actually there's a kind of cheat called snr tweaking) . vdsl is likely to be the same.

that said, you'd probably not notice much difference between 70 and 90.

SamF

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#651368 5-Jul-2012 15:22

mercutio: it's actually impossible to sync at 24 megabit in nz on non-llu adsl (actually there's a kind of cheat called snr tweaking).

Sounds intriguing!

McGee

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#651369 5-Jul-2012 15:24

You can do that on the FritzBoxes too but it does void the warranty in order to do so.
Napster has details on how to go about it last time I checked.

SamF

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#651371 5-Jul-2012 15:27

McGee: You can do that on the FritzBoxes too but it does void the warranty in order to do so.
Napster has details on how to go about it last time I checked.

Is that because you have to activate telnet in order to do the tweak?

mercutio

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#651372 5-Jul-2012 15:28

SamF:
mercutio: it's actually impossible to sync at 24 megabit in nz on non-llu adsl (actually there's a kind of cheat called snr tweaking).

Sounds intriguing!

basically on broadcom asdl modems you can telnet (or ssh with some) and then you can get a shell (admin/admin is default username/password)

you can then do something like:

> adsl configure --snr 30

to get a lower snr

you can do:

> adsl info

to find out if you're synced yet

and

> adsl info --stats

to see the normal system information

you can raise that 30 to a higher number to have a higher snr margin. and you can lower it to get a lower snr margin. the lower the snr margin the higher chance you have for dropouts, but also for increased sync rate. if you want a snr margin below 6db you have to "cheat" by having a really high number like 65520 where it wraps around with 65535. still the same rule - lower number lower snr margin - minimum i think is something like 65450, but that's likely to be unstable.

if it screws up you can always reboot - it won't persist across a reboot, but it will across a resync. it's generally only good for a megabit or two though, and you can't adjust the up speed.

i'm curious if the fritzbox has a way to alter snr.

McGee

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#651373 5-Jul-2012 15:32

SamF:
McGee: You can do that on the FritzBoxes too but it does void the warranty in order to do so.
Napster has details on how to go about it last time I checked.

Is that because you have to activate telnet in order to do the tweak?

Yes it writes something to the PCB and it will always say it's unsupported by the manufacture and no matter how many factory resets or firmware down/up grades etc that you do it won't go away.

mercutio

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#651377 5-Jul-2012 15:38

McGee: You can do that on the FritzBoxes too but it does void the warranty in order to do so.
Napster has details on how to go about it last time I checked.

Can you adjust the upstream snr margn?

SamF

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#651382 5-Jul-2012 15:42

McGee:
SamF:
McGee: You can do that on the FritzBoxes too but it does void the warranty in order to do so.
Napster has details on how to go about it last time I checked.

Is that because you have to activate telnet in order to do the tweak?

Yes it writes something to the PCB and it will always say it's unsupported by the manufacture and no matter how many factory resets or firmware down/up grades etc that you do it won't go away.

Geez, that's a bit harsh!! Surely you can't actually damage the hardware via some kind of telnet command!?

McGee

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#651388 5-Jul-2012 15:50

Well that's just from experience, Did it on mine and can't get rid of it and same with a mate who's got one.
I asked AVM about it and they've said they can't offer support for it.

SamF

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#651389 5-Jul-2012 15:53

McGee: Well that's just from experience, Did it on mine and can't get rid of it and same with a mate who's got one.
I asked AVM about it and they've said they can't offer support for it.

Oh don't get me wrong, I believe you, but I can't believe that AVM would take such a hard line with telnet access!?

McGee

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#651394 5-Jul-2012 16:04

I think it's mainly cause of what you can do with the telnet access, I only used it cause I was running a PABX behind my fritz and needed to port forward 5060 to an IP rather than the device itself.

mercutio

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#651397 5-Jul-2012 16:13

McGee: I think it's mainly cause of what you can do with the telnet access, I only used it cause I was running a PABX behind my fritz and needed to port forward 5060 to an IP rather than the device itself.

that seems a pretty big limitation.

Napster

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#651610 6-Jul-2012 00:14

Apparently you can reset that no support warning by running the fritzbox recovery tool.

Also to change the Training SNRM you have to edit the cfg file through telnet.

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