would anyone know the minimal signal strenght for a cabal modem to connect to ?

[Dreadogg]

I recently have had my cabal modem hooked up and the dam thing never connected to the server or what ever it does, its a Ericsson Piperider HM 200c and there are 5 lights on it and only the bottom one is blinking it seems to be a smilely face. I seem to think that the modem is shot or its not receiving a great enough signal so if anyone has some info it would be greatly appreciated.