The GPS, GLN (GPS/GLONASS) and PZF (DCF77) clock modules are the central synchronization elements in an IMS system. The internal clock carries a highly stable oscillator that is utilized to generate the base synchronization signals which are distributed to all I/O module slots via the backplane. In case of a complete loss of all external synchronization sources, the clock module will enter hold-over mode and allows the output modules to continue to work for a certain amount of time.
Each IMS system requires at least one clock module and can be turned into a redundant solution by adding a second clock module and a signal changeover unit such as the RSC.
The available clock modules always come with an integrated receiver for external GNSS/radio signals and accept a large selection of other synchronization sources like pulses, frequencies, time codes and serial time strings when combined with either an MRI or ESI card.
Currently available clock modules:
IMS GPS: Meinberg GPS Receiver
IMS GLN: GPS / GLONASS / Galileo / BeiDou Receiver
IMS PZF: Correlation Receiver (DCF77)
IMS-TCR: Time Code Reader and Generator