10-4
September 27, 2000
68P81093C75-O
• Two FLASH memory ICs (which contain the WIB operating
software downloaded by the SCM)
• An ASIC device to process and route the various audio signals
Analog, SECURENET, and ASTRO signals are processed as follows:
• Analog signals are converted to digital signals and routed to the
Station Control Module via the Time Division Multiplex (TDM)
bus.
• ASTRO and ASTRO CAI data signals are processed by an ASTRO
modem card (the daughter board is plugged into the WIB) and
sent to/from the SCM via the HDLC bus. (The station operates
in transparent mode only, and does not perform encryption or
decryption of the ASTRO or ASTRO CAI signal.)
• SECURENET encoded signals are processed by the ASIC, sent
to/from the microprocessor via the data bus, and sent to/from the
Station Control Module microprocessor via the HDLC bus.
(The station operates in transparent mode only, and does not
perform encryption or decryption of the SECURENET signal.)
NOTE: The WIB is offered in the 4-wire configuration only.
Power Supply Module
Operation
The Power Supply Module is a switching-type power supply which
accepts an AC input (85-265 VAC, 49-61 Hz) and generates the 13.8
VDC for the station modules and the power regulation circuitry on
the motherboard.
The Power Supply Module is capable of 12 A continuous load and
18 A maximum load.
