5-4 MTR3000 Station Control Module: Functional Theory of Operation
5.2.1.3 Station Reference
The SCM is offered in two versions, a TCXO version (DLN6719) for UHF band and an OCXO version
(DLN6718) for 800/900 MHz band. A TCXO provides the frequency reference for the base station/
repeater for a TXCO controller kit. For the 800/900 MHz controller kit, an OCXO provides the
frequency reference for the MTR3000 Base Station/Repeater. The TCXO/OCXO output is 16.8 MHz.
The FPGA is used to create other clocks locked to the TCXO/OCXO which are needed by various
devices on the SCM. The clocks are summarized in Table 5-1:
Table 5-2 summarizes the FCC required frequency stability requirements for various bands.
5.2.2 Rx OMAP
The Rx DSP is a TI OMAP Multimedia Processor. The OMAP1710 consists of a microprocessor unit
(MPU) subsystem and a digital signal processor (DSP) subsystem. OMAP1710 has dedicated
external memory interface that allows point-to-point connection to standard mobile SDRAM/DDR
and mobile flash devices. It is a low-power device (1.4 V Core and 1.8 V I/O supply). The Rx OMAP
handles receiving tasks of the SCM only.
Table 5-1 Station Control Module (SCM) FPGA output Frequencies
Frequency Destination
12 MHz Tx OMAP, Rx OMAP
24.576 MHz MAKO
32.768 kHz Tx OMAP, Rx OMAP, MAKO
Table 5-2 Station Control Module (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 External Reference required 5 years
0.1 External Reference required 1 year
Note The TCXO version (DLN6719) is for UHF band and the OCXO version (DLN6718) is for
800/900 MHz band.
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