4-8 Theory of Operation
Table 4-3 summarizes the frequency stability and service intervals for the TCXO and OCXO.
4.2.3.2 MTR3000 Controller Clocks
The FPGA is used to create other clocks locked to the Temperature Compensated Crystal Oscillator
(TCXO) or Oven Controlled Crystal Oscillator (OCXO) which are needed by various devices on the
Control Board. The clocks are summarized in Table 4-4.
Table 4-3 SCM FCC Frequency Stability Requirement
Required
Stability
(ppm)
TCXO Service
Interval
OCXO
Service
Interval
5 5 years 10 years
2.5 2 years 10 years
1.5 1 year 10 years
1 6 months 10 years
0.5 Ext Ref Required 5 years
0.1 Ext Ref Required 1 year
Table 4-4 SCM FPGA output Frequencies
Frequency Destination
12 MHz Tx OMAP, Rx OMAP
24.576 MHz MAKO
32.768 kHz Tx OMAP, Rx OMAP