Its a 110 block with C-clips bridging 2 of the lines together throughout the entire house. This is most definitely setup for your phone lines (at least as configured). The good news is that it may be possible to convert it into 10/100 and possibly gigabit ethernet depending on if there are other locations that they tied the lines together or not in the house (if all 4 pairs actually exist at the drops in the rooms and not just the 2 pairs that are currently shown as bridged together you can convert to gigabit ethernet by re-terminating and changing the C-clips on that 110 block to connect to a RJ45). Here is a quick how-to on this kind of block:
110 wiring blocks are commonly used for distributing telephone lines in homes and offices. If your home was built after 1990 there's a goo...
tombuildsstuff.blogspot.com
To convert to RJ45 you would need something like the following (this is just the first I found, there are plenty of others and probably cheaper as well):
www.specialized.net
Or this:
Cat5e, 4-Pair, 110 to RJ45 Patch Cable, Gray, 7 Foot
store.cablesplususa.com
You need to make certain that the replacement RJ45 clip is wired the same way as the 110 block is wired (i.e. the proper colored pairs are in the proper location), otherwise the wires will not be on the correct pins of the RJ45 (you can compensate on the other end of the wire when you re-terminate the CAT5 to RJ45 assuming it is currently only RJ11 currently, but that is a real pain in the a** and probably better to just re-wire the incoming lines to the 110 block properly as there is probably enough slack to cut them and punch them down in again).
Again, for gigabit, it will need all 4 pairs both at the room and terminated in that 110 block. Most phone/electricians/contractors will only terminate 2 pairs in typical home installations (as can be seen from the c-clips) because they were only thinking 2 lines might exist for a typical home environment (1 for phone, the other possibly for fax, modem, or possibly a second line for teenagers back before cell phones). And to save on time wiring, they would simply not connect the other lines and possibly cut them off which means you might need to re-wire the 110.