Well, they come in 5 pair, 10 pair, and 25 pair modules. I began using them for splicing OSP cable, and also for splicing from OSP to protectors when I was a splicer for the CSU system.
Anyways. 3M makes them now, and they look somewhat similar to a 25 pair long 110 block. It's a four step process, you use what's called a unipress, or 710 press. You lay all 25 pairs into the module itself, and then press them into the IDC teeth. Then you engage the blade and cut the excess off. Then you do the next module, and from there crimp the two together using a third piece that's for a direct splice. Hard to explain, I'll see if I can't find some photos.
They also make bridge tap modules.
Basically... this allows you to interface up to 25 pair at a time for large splice applications.
The reason I would use them for something like this, is that they're designed for splicing, and they make them cat5e compliant. It's the only thing I could think of that's actually designed for splicing that's Cat5e rated.
Here's a photo of an older model:
The cap you see at the top is removable, and looks somewhat similar to an elco connector. It's used to patch into a 25 pair test unit for testing 25 pair at a time as you complete the buildout for a particular cable or system. They work great... and if you do anything with large pair count cables, you should definetely look into getting one. They make a 5 pair model that can do the 25 pair modules, just takes a hell of a lot longer.
