Ah. Well we had (big) routers in several racks (800 wide, 1000 deep, 47u high) as well as optical kit. Each bit of kit had its routing engine (with two serial ports) as well as a backup engine, so each box needed 4 serial connections back to a terminal server as well as two ordinary ethernet connections back to a switch. All this was only manageable with
400x400 vertical cable management ducting and 24 or 48 cat5 ports prewired between racks. Then there were a couple of hundred fibres connecting the routers and the optical kit, running in different ducting on top of the racks. So, some huge optical patch panels too.Well, this is why I'm not sure what I was trying to do was going to scale. The answer was to have them made up on site, which worked well enough for copper and power - I didn't even try that with fibre.
But doing that sort of thing was the only way to keep on top of the rats nest. Trouble is, there's always folks back home who seem to think that all cables are infinitely thin, and should therefore not pose a problem.
By the time I retired, we were just starting to look at precabling fibre connections between racks, too, but I don't know whether than got taken any further.
I hope all your cables are labelled at each end, then :-)