Internet speed configuration between router & other devices

[Dreamweaver]

I wonder if someone can help me with this lag issue probably caused by my new digital TV?
When my digibox is working and I'm trying to play NoX with several people, it will sooner or later make unbearable lag. I know it is because the digibox consumes by default the majority of the Internet traffic resource (speed) that runs through my router.
The question is, how do I configure my router to limit the digibox speed and give my Ethernet cable computer more speed?

[Drakano]

Some more informations about your router would be pretty nice. : P
Like the model and maybe your ISP (Internet Service Provider).

[Dreamweaver]

ISP: Elion Estonia
Router: Thomson TG789vn
Does it help much?

[superjack]

I have the exact same router.

[Drakano]

In the manual and internet I've found anything suitable. Maybe your tv box has a setup? If not you could send some pictures of your router setup and possibly someone can help so.

[Dreamweaver]

Most probably, Superjack can help me out of this problem, since he has the same router and he's, after all, a computer specialist (by his current school )

[superjack]

no I fail at it, drakano's much better at it

[Dreamweaver]

My digibox seems to have not given me any more trouble lately. I even had it switched on for a while during the yesterday's official game and there was no remarkable lag whatsoever. Perhaps the problem comes only when HD channels are being watched from the digi-TV, which wasn't done yesterday.
At the same time, I can't really stand any bad surprises during tournaments and the such, for example the catastrophe lag that made me lose the Fragmachine 3 and which other people didn't seem to have

[superjack]

you can always just get a new router

[Dreamweaver]

I'm poor, don't have enough money to pay electric bills to play NoX :p