The Pacific Intertie Network is a closed/friendly network of C4FM repeaters.
The Pacific Intertie Network, aka K6PIN, is a series of linked, C4FM, Wires X, digital Fusion repeaters that cover a good part of Southern California, including the high desert.
Current sites are: Sunset Ridge, Crestline, Box Springs, Pleasants Peak, Running Springs, Industry Hills, West Covina and Oat Mountain.
Intro to System Fusion and Wires-X Integration from HamCom 2016
The Four Operating Modes of System Fusion