Specifications

60 209351 REV B Operations Manual, Redundant System Controllers
5.0.2 Digital Core Board
The digital core board is the heart of the redundant controller. At the center of the dig-
ital core board is the Atmel AVR Mega 103 microcontroller. The microcontroller oper-
ates at a clock speed of 7.68 MHz. It provides control functions through the use of an 8
bit wide data bus and 16 bit addressing bus for most of the peripheral devices. A sepa-
rate UART and collision detector is provided for extremely robust serial interfacing with
multi-host networks. All digital I/O lines are protected by opto-coupling or transient ab-
sorbing devices. The power supply lines are protected by current limiting devices. The
digital core board also contains the interface circuitry that allows the RCP to be firm-
ware upgradeable in the field. A block diagram of the Digital Core Board is shown in
Figure 5-2.
Figure 5-1: Block Diagram, Power Supply Configuration
PS Overload Protection
PS2 26V 6A PS1 26V 6A
LNA1 PS
LNA2 PS LNA3 PS
13/17V/Off Select
26V 1.5A Max
On/Off
26V 1.5A Max
On/Off
26V 1.5A Max
On/Off
26V On/Off Select
+13/18/26 V Out to LNA/LNB Plate
To control core
26V 5 Amp Max Output
to RF Switch drive
Optional hardware,
available on -HP
models only
+13/17V
900mA
+13/17V
900mA
+13/17V
900mA