When I initially laid out my snakes, it's mostly 1-2-3-4-5-6...etc...and it's about pairs (1-2 = L-R) and then input/outputs....so 1-2 = L-R Input and 3-4 = L-R Output...and so on...plus I number my snakes, which are either 12, 24 or 48 channel snakes. All of that I write down, mainly so when I need to get behind the racks to rewire or move some equipment around, I can trace the cables easily and know I have the right ones at both ends...
...but the real labeling is done at the patch bays, as I rarely have to pull/move the actual cables on the backs of the units.
On the bays...I'll write out the name/model of the gear...like VLA would be my ART VLA compressor, and on the bay, the top is usually the gear's output, and the bottom points are the gear's input, and everything is configured as Left and Right.
Sometimes I break from that format, like with my pres, I only have outputs on the main bays (the inputs are on my XLR bays)...and so I may have two outputs on top and two below them for a 4-channel pre...to better use the available points.
These are my actual patch bay strips that I created...all on one sheet of paper, and then I cut out each strip and slide it into the left or right or top or bottom of the patch bay label strip holder.
