One office, one ethernet jack and two computers, or
One living room, one ethernet jack and one HTPC and one XBox.
If you can't realistically (without tearing apart walls or renting a scissor lift) pull one more ethernet cable from the patch panel to the office / living room etc. you can consider the use of an Ethernet "splitter".
I'm assuming all the four pairs of the ethernet cables are properly connected within the ethernet wallplate and the patch panel.
Step 1: What you need
- Two RJ45 Crimpable Plug
- Four RJ-45 keystone jack
- Short Ethernet Cable Scrap (approximately 2 feet)
- RJ45 Crimp Tool
- Craft knife
- 110 Punch Down Tool
- Loctite Super Glue
Step 2: Crimp the RJ45 Plug to the ethernet cable
Taken from the excellent Hardware Book: www.hardwarebook.net/cable/network/ethernet10basetstraightthru.html
Step 3: Punch down the other end to the RJ-45 keystone jacks
- Jack #1:
2 Orange to pin 2 keystone jack
3 White/Green to pin 3 keystone jack
6 Green to pin 6 keystone jack
- Jack #2:
5 White/Blue to pin 1 keystone jack
7 White/Brown to pin 3 keystone jack
8 Brown to pin 6 keystone jack
Once all the pairs are punched down, you can glue together side by side the two keystone jacks.