Overview of the Primex ClassicSync Solution
Learn how the solution works and how the system devices provide synchronized time.
Architecture
The Primex ClassicSync solution provides synchronized time using our 72-73 MHz unique broadcast frequency to transmit a
wireless signal to all system devices. The frequency allows the system wireless signal to broadcast through common building
materials and across longer distances with less potential for signal interference. The solution can be configured with either a GPS or
NTP time source. The system consists of a single Transceiver with an internal or external antenna, a GPS Receiver (optional),
Repeater Transceiver (optional), and the system clocks and other devices in a single building, to a campus wide deployment.
Time synchronization
Once a Transceiver has received its time, from either a GPS Receiver or NTP time source or another Transceiver, it sets its internal
clock. It then transmits time information over the 72-73 MHz wireless radio frequency signal to the secondary system devices. As a
result, the system devices are precisely synchronized to each other and all time and events are kept current.
Time Source: Transceiver receives time from a GPS Receiver or a NTP server and then broadcasts received time and event schedules
to clocks and other system devices. The Global Positioning System (GPS) Receiver draws time information from the U.S. Government
Satellites. The GPS Receiver then sends the time to the Transceiver.
Frequency and channel: Transceiver operates on channels with 20kHz bandwidths and 72-73 MHz frequency and is preset to one of
the channels licensed by the FCC/IC to minimize interference on these frequencies and channels.
By factory default, a Transceiver with an external antenna: transmits (broadcasts) its synchronized time to the system clocks and
devices from the 39th to the 6th minute of the next hour and changes to a standby mode during the 7th to the 38th minute of the
hour (standard broadcast schedule). Transceiver also has a power-on transmit schedule that sets the duration of time the
Transceiver transmits (broadcasts) a signal when first powered on (factory default 8 hours).
Analog Clock signal search frequency: six pre-scheduled times a day at 10:01, 2:01 and 6:01 a.m. and p.m. lock time (not the actual
time of the day), a clock's receiver turns on to search for a Transceiver signal to receive a time update, starting with the previously
stored channel number.
Digital Clock/Timer signal search frequency: every 10 minutes on the 5's (5, 15, 25, 35, 45, 55 minutes) of the hour, a clock's receiver
turns on to search for a Transceiver signal to receive a time update.
Transceiver power-up sequence
1. When power is first applied, it searches for a time source. It first searches for GPS and then NTP.
2. If a time source is not found, it uses its onboard real time clock (RTC) and continues to search for its time source.
3. If a time source is not found, the Transceiver is set to a warning state with a time sync failure status, its front panel Caution LED
status indicator is illuminated, and transmits its state to OneVue at its scheduled check-in time (default every 5 minutes).
4. If it fails to get time from either source consecutively for 30 minutes (default), it enters an alarm state, its front panel Error LED
status indicator is illuminated, and transmits its state to OneVue at its scheduled check-in.
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