Wow. I can't believe that one of these could still be functioning!

From personal experience of trying to fix one about 12 odd years ago, you will get better ADSL experience using a more modern router.

Back then we were on a 2 megabit plan with ihug and couldn't get more than around a 900kb connection, had a proper master filter and all. This predates all the new cabinets Telecom (as known back then) were rolling out. I just happened to of had a Dlink ADSL router which I got off trademe for $10(ish) which was the type Telecom were giving out for Xtra so I tried it and instantly got a 2 megabit connection. 

So in short my point is the M1122 routers don't really get on well with the dslams that are currently in use.

http://wiki.wlug.org.nz/archive/nokia/m1122.pdf

http://www.unixathome.org/adsl/archives/2002_04/0089.php

Loved mine but for life of me cannot remember anything about resetting them etc :D

Ah I remember these :D

I'm fairly sure you can do it using a CLI cable and the "restore" command or something.  

CLI cable same pinout as Cisco if memory serves.

Is there a pinhole?  I honestly can't remember.  If so try pushing the button inside for 10 seconds or so.  You might have to be holding it in while you power it on.

Is there a reason you're still using the M1122? Unless you're in the remaining 1% of so of connections in NZ that can only get ADSL1 on BUBA all you're doing by using that hardware is heavily restricting your performance.

I know its pretty old ( I just dont like throwing things away )

I was going to give it to my elderly neighbour who is still on adsl

If you like your neighbour spend $10 on trademe and get them anyone of a dozen more modern and better speed modems. The M1122 was fantastic, but it's well past it's use by date.

99% sure there is a need to use the CLI interface to reset these boxes.

Ah such good memories, getting one for free year ago and used it for a number of years before the PSU died on it