Справочник Пользователя для Motorola Solutions Inc. 92FT4843

10-4

December 1, 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.

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.