Depending on how far out the drop opening needs to be from the horizontal CableLinks trough, one of the following two options would work for a 2" CableLinks trough:

A drop that is in-line with the overhead trough:
1 @ 027-1000-4227 - TRAX (2) CENTER DROP
2 @ 027-2000-4299 - TRAX (2) FASTLOCK COUPLING KIT
2 @ 027-1000-4207 - TRAX:(2) TRAX TO CABLELINKS ADAPTER
 
A drop that extends out from the horizontal run, using a “T” intersection:
1 @ 027-2000-4210 - TRAX (2) T-JUNCTION
3 @ 027-2000-4299 - TRAX (2) FASTLOCK COUPLING KIT
3 @ 027-2000-4207 - TRAX:(2) TRAX TO CABLELINKS ADAPTER
1 @ 027-2000-4277 - TRAX (2) CENTER DROP


For a 4" or 6" CableLinks trough, similar style pieces would be used except the part numbers would be adjusted for the correct trough size.