No, you can get network interfaces that can send/receive on the same pins and hence can be connected together without crossover cables. Macs have had that functionality for years, and it looks like Sony have put a NIC in the PS3 that will do it as well. A quick look on Wikipedia shows the following:
Looks like it's part of the gigabit ethernet standard.
#5728473, By SlightlyMagic how to move saves and dlc to new ps3
SlightlyMagic 52 posts
Seen 3 years ago
Registered 7 years ago