can you connect a sega dreamcast with a phone wire to a pc

i want to connect my sega dreamcast to my computer (i have a dell dimension 4600). i think theres away of networking them with a normal phone wire like you would use to hook your phone up to the phnoe jack in the wall. since there is no ethernet cable in the sega dreamcast. i want to be able to acces the internet using my sega dreamcast i have dsl so i should be fine if there is a adapter to turn a normal phone jasck cable into a ethernet cable then i think that would be good too but if any one else knows of a another way to do it then that would be good too.
thnx