Someone just gave me a

Question

someone just gave me a brothers mfc7300c mach. i am tryingto figure out how to hook it up ,it is differant from my otyer brotherrs fax a mfc 2240c,,the wireing is not the sameon the 7300c there is a power cord and 3phone jacks on therear one goes to hand setother to phone line the middle one is emty than there is a jack in the rear of i dont know where it goes ,does it get pluged into the computer,according to the manual i do not see asny connection into the computer.