happen to run across this thread over on the Ethernet newsgroup -
Some guy found a RJ45 splitter (2-RJ45 jacks to 1-RJ45 jack) over on ebay (search RJ45 spliiter) that look like the telco 1-line 2-line adapters, but yet this guy (and the ebay description) says these "splitters" ....
Features: a.. Convert a single RJ45 outlet to two RJ45 sockets easily, point for more conveniently use
b.. Increase the number of RJ45 network connections on an RJ45 outlet
c.. Compact design, feel free to enjoy your internet surfing
d.. Expand one RJ 45 outlet into two 8 wire RJ-45 T adapter, parallel wiring
e.. Connector: 3 x RJ45 female
f.. 100% Brand New.
It doesn't even seem possible to have more "network connections" by just splicing more Ethernet wires together vs a dumb hub ????
I could see if you were trying to split out the tip/ring (4/5) or power (7/8) but an Ethernet splitter ?????