1) Chico or Fresno campus inits 2) Chico sch 3) Colorado state university 4) Fort Collins campus 5) Fort Collins sch 6) Fresno campus inits 
Channel service unit used to connect to digital leased lines on the line side.
Channel Service Unit, the interface to the T-1 line that terminates the local loop.
Channel Service/Switching Unit
Converter Synchroniser Unit
Combined Service Unit
acronym: Colorado State University (Fort Collins)
Community Safety Unit
Channel service unit. Digital interface device that connects end-user equipment to the local digital telephone loop. Often referred to together with DSU, as CSU/DSU. See also DSU.