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1 Introduction
Figure 1. Master Clock System Front View
Brandywine's M212 Master Clock System represents the next generation of modular
timing systems. Built as a commercial derivative of the highly successful ruggedized
Modular Master Clock, the M212 provides assured timing capabilities using
Brandywine's Timewall™ technology.
At the center of the M212 system is Brandywine's powerful Master Clock Module
(MCM). The MCM may be synchronized by a variety of reference sources and uses the
selected reference to steer an embedded oscillator to provide stable and accurate time
and frequency for the M212. Multiple references can be prioritized with automatic
failover. Uniquely, the MCM's Timewall™ algorithms validate the GPS reference based
upon the inherent stability of the MCM oscillator, providing hardening against possible
GPS spoofing.
Available input reference selections include GPS (both C/A code and SAASM receivers
are supported), IRIG-B, and Have Quick/1PPS. In additional an MCM may be
synchronized to up to 2 other M212 chassis using a fiber optic crosslink, this provides
additional resiliency for the M212 time and frequency references.
The standard oscillator in the M212 is a high quality Temperature Compensated Crystal
oscillator, but the M212 optionally can be ordered with other reference oscillator
choices, including Rubidium, Chip Scale Atomic Clock (CSAC) and Ovenized Oscillator
(OCXO)
The output signals for the M212 are generated by up to 6 Output Signal Modules (OSM),
and are ideal for custom solutions or future expansion. Available modules include NTP,
low-phase-noise frequency, time code modules such as IRIG A, B, G, H, and NASA 36,
BCD, PPS, PPM, Have Quick, serial data (RS232/422) as well as optical crosslink.
The M212 status and control is via front panel display for basic configuration and status,
a secure web browser, and via SNMPv3. Network protocols also fully support privacy
and authentication.
7
MANUAL P/N 900000178 REV B
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