ADSL Disconnects when my mac connects to the network or when ever it wants

Nothing your Mac can do should ever affect your router, so it instead sounds like a bug in your ADSL router's firmware.

Do you know if the manufacturer has any updates available for it?

Hi post the router make and model number and I try to help.

Tim

some routers don't have very powerful CPU's and can be overloaded with multiple connections. This is especially true when using bittorrent. This can be fixed by setting your torrent client to connect to maximum number of peers of say 100 overall.

If your DSL is disconnecting when you run various applications, the blame is with your DSL router.

Other people on the network have no issues with bit torrent

Yes but they may be using all the routers resources.

If you have multiple devices on the network the router may just be crashing. I have seen this before with thompson routers. I have seen Thompson 780wl crash with more than 3 devices connected to it. When used with 1 device it was fine.

Dlink in my experience are buggy at the best of times. I would suggest you flash your router with the latest firmware you can download from dlink.

I would suggest as william indicated replacing your router with a more efficient one.