7000 is one of the ports used to connect to a network by way of its servers (totally different from fservs/fileservers). DCC default ports are 1024-5000. DCC is Direct Client to Client connection, you are not getting the files over the network, you are establishing a connection directly to the sender. DCC is only going to go as fast as the slowest end, and that is dependent on each person's connection speed, the connection between the two of you, how much else either of you are doing, any restrictions the sender may have, how many other ppl y'all are sharing bandwidth with at any given time, etc.
