In addition to supporting several different clock types and up to 4 devices, the processing of a PPS signal is also provided as a configuration option. The reference clock support in NTP contains the necessary configuration tables for those receivers. The driver is configured to interpret the time codes of Meinberg DCF77 AM receivers, DCF77 FM receivers, Meinberg GPS16x/17x receivers, Trimble SV6 GPS, ELV DCF7000, Schmid, Wharton 400A and low cost receivers (see list below). The actual receiver status is mapped into various synchronization states generally used by receivers. The PARSE driver supports 20 different clock types/configurations. PPS device: /dev/refclockpps- u alternate PPS device (if not available via the serial port) Serial Port: /dev/refclock- u TTY mode according to clock type Generic Reference Driver Generic Reference Driver
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