This read-write INTEGER selects whether the CMM-III's GPS timing pulse output acts as master(1) or slave(0) for synchronizing other equipment. It matters because in a multi-unit deployment only one CMM should normally act as the timing master, with the rest slaved to it to keep radios in sync. An installer bringing up a new CMM-III alongside an existing timing source would set gpsTimingPulse to slave(0) on the new unit so it follows the existing master instead of conflicting with it.