splitters have two input-belt-sides and two output-belt-sides on which you can connect any transport belt or underground belt
splitters don't shuffle the lanes on the belts; items on the left input belt lane don't change the side to the right lane (and vice versa).
Splitting
if two output-belts are connected, then every input-item is put alternated on one of the two output-belts. Or in other words: it is guaranteed, that the inputed items are output in a ratio of 50% on each belt.
if one of the output belts lanes are full, then it tries to output on the other output belt. This is useful to fill belts.
JoiningFile:T&T Belt04.jpgFeeding from side is only a good use, if you want to make a queue - e. g. for mines, some output-buffer
splitters can be used to join two belts into one. This has a much higher throughput than only side-inserting.
as with splitting, the belt lanes aren't mixed up.
Use faster splitter if you want to feed into a faster belt, because otherwise your splitter is the bottleneck!
Special behavior
Splitter/Priority: when both input belts are at full capacity, then the splitter prefers the left input, or in other words: the right input is only taken to fill gaps in the left input. This can be used to priorize an item-source, for example a storage. File:T&T Belt08.jpg
When you feed a belt from the side, the throughput is limited. With v0.7 this has been improved much, but it is also simply the fact, that you feed only onside of a belt.
