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Copper Cabling Systems

Conduit Fill Ratio Guidelines

The two common pin pairings are T568A and T568B shows in the figure below:

Recommended Cable Slack
Work area 4-pair twisted pair 12” minimum slack after termination.
TR/ER 4-pair twisted pair farthest corner via the pathway plus floor to ceiling.
TR/ER multipair length of backbone plus floor to ceiling.

Cable Bend Radius
4-pair UTP or SCTP cable 4 times the outside cable diameter.
Multipair copper cable 10 times the outside cable diameter.
TBB 8 times the outside cable diameter.

Interesting articles about copper horizontal cabling systems:

De-Mystifying Cabling Specifications From 5e to 7A

Guide to Alien Crosstalk in Network Cabling Systems