Telephone Cord To DSL Modem, 2 wire or 4? Please help!?

I have a dsl modem which has a 4 wire/prong phone cord connection from the modem phone line to the wall but the dsl light blinks and only works and stop blinking with the 2 wire/prong phone cord i have. why is that? also my phone jack in the wall has a 4 wire/prong connection also. what's the diffrence in a 2 wire,... show more I have a dsl modem which has a 4 wire/prong phone cord connection from the modem phone line to the wall but the dsl light blinks and only works and stop blinking with the 2 wire/prong phone cord i have. why is that? also my phone jack in the wall has a 4 wire/prong connection also. what's the diffrence in a 2 wire, 4 wire and 6 wire phone cord?
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