Hi Guys
I've been having this problem for the past month. I'm running a Netgear DM602 and this is my 2c worth.
I've logged a plethora of calls with Telkom. I would list all my ref# here but seeing there isn't enough disk space on all the computers in the world, I'll spare that thought.
Ok, to get back to the problem. Once my router sync's up, I've got roughly 5 - 10 mins of surfing time before the router drops its connection. On querying the details through the gateway admin page, I notice that I'm transmitting packets but receiving nothing. Pinging anything but the router returns bugger all so I've been disconnected.
I called the Telkom techs in, they brought their router and plugged in. Sync'd in about 20 secs and no problem. It turns out that everyone has line attenuation (?? spelling). The normal level of line attenuation is generally around 56-58. The cut-off is 60. In other words, anything higher than 60 will cause problems with your connection. On plugging in the POTS router, my line attenuation is sitting at 58. When I plug in my Netgear, it jumps to 63. Although you can use it at values higher than 60, your modem will disconnect because the line is unstable.
How do we fix this??? Well, there's 2 ways of fixing it (and this is according to the telkom techies).
Fix 1 : use another router
or
Fix 2 : use another router
Surely there must a filter or something that you can plug into your line that can keep your attenuation at a certain level. I'm no electrical engineer and I have no clue what line attenuation is but if anyone out there can give some advice, please do so.
And by the by, I'm patenting this line attenuation stabilizer device

unless its already been thought of before
My advice to anyone out there with the same problems, get telkom to check your line attenuation and if its over 60 and you get it working, please tell me what to do. I've just forked out for the netgear and I don't feel like forking out again for another router, especially the very cheap POTS router