How can I make use of a wireless modem router which no longer works as a modem ???

I would think it would work fine as a 4-port switch. Ignore the WAN port and turn off the DHCP server, etc.

No. Because the ADSL port is unavailable, you cannot use the router section. In order to do that, you would need to have access to the connection between the ADSL modem output, and the router input. That's not brought out, so the whole DSL and router chain is useless.

Sure. No problem.

You might also consider using it as a wireless access point. See:

In theory, the mass of the paper weight should be more than the mass of the pile of paper under it, or the pile will fall over. Since the router is a lightweight, the amount of paper it can stabilize is rather limited. It can be used as a paperweight, but something heavier would do better. Perhaps if you fill the case with concrete.

I prefer to divorce my imagination from reality using an assortment of controlled substances. Under this condition, no thinking is possible.

Hint: You might try resetting the DG-834G and reflashing the firmware with the latest before giving up.

Many thanks jeff - enjoyed your reponse.

will try reflashing

I followed your link to the 'using a wireless router as an wireless access point' and it seem exactly what I can do to extend my wireless network. The only thing is it seems suspiciously easy to do - I will give it a go tonight. Many thanks

it is easy to do it the right way, especially when you find out how to do it BEFORE you do it wrong.... simply amazing how many do it wrong/their way/a friends way/the salepersons way/etc, get frustrated and give up....

Yeah, I know. Anything that easy can't be any fun. Such instructions really should be in the equipment manuals, which nobody reads.

Hint: Try the access point using a different unique SSID so that you can distinguish between your existing wireless SSID and this one. Also, select a different non-overlapping channel (1, 6, 11) to prevent mutual interference.