A "rack mount
The back of the panel has jumpers distributing the different phone lines to each panel jack. The example shown is a typical 24-port patch panel, rotated 90 degrees so the top is to the right. Click on the panel controls to show the different jumper wires.
An obvious advantage to using a
How you wire the back of the panel depends on how you wire your jacks. If you are consistent with what wires you use for line 1, line 2, etc. you can wire every port on the panel the same. You have more than two phone lines (or plan to in the future), you might want to wire some ports differently than the rest.
The telephone service cable should plugged into the last port on panel. When wiring a jumper, try to make the connection to the service port in the middle of the jumper. In the example shown, the service plugs in to port 24. Each jumper connects to port 24 in it's middle, running to other ports in both directions.