User's Manual Part 1

Table Of Contents
Functiona
l
Description 3EM21522AAAA
DTR-0200-SA-SIRIUS Issue 1, March 2008
2-14
2.3.1.4.1
Main Controller Microprocessor Chip
The MPC860 microprocessor performs all site management to include control of the
GPS receiver, modem, and L-band DVB-S/S2 receiver. The controller also communi-
cates with the SPU modules and on-board components via dedicated interfaces using
soft-w
are defined protocols. The MPC860 chip connects to the Ethernet, to an exter-
nal monitoring/controlling console (PC), to the VSAT receiver, the internal modem, to
the upconverter
, to the power amplifier, and to the following front panel components:
the status LED, the Local/Remote switch, and the Reset switch. The MPC860 also
connects, via the module internal I2C bus, to the ATmega256 control processor
(supervisor controller).
Ethernet connection-via an internal Ethernet controller connected to an internal
Ethernet switc
h and terminating at four RJ-45 connectors (J115A, J115B, J115C,
and J115D). External Console connection via a UART (UART0) internal to the
MPC860 chip and connected to module internal connector J129 (DB9-F).
VSAT Receiver- connects to the MPC860 chip via the module internal I2C bus
and internal connector J129.
Internal Modem connection-from UART2 in the MPC860 chip to the modem and
then to the RJ-11 connector at J119.
The Upconverter-connected to the MPC860 chip via the module internal I2C bus.
Power Amplifier connection-to the MPC860 chip via RS485 bus. This is a full
duplex P
A control line.
Front panel components-the status LED, the Local/Remote switch, and the Reset
switc
h connect to the J129 internal connector on to the I_C bus and into the main
processor chip.
2.3.1.4.2
Supervisor or Control Processor
The ATmega256 chip monitors status, temperature, and RF power. The chip also con-
trols output digital relays required for interface with the external equipment.
Relay Control – The ATmeg a256 connects to the Relay Control Group via back
panel DB25 connector P18 for fan control (four c
hannels).
Fan Speed & Door Monitoring – The processor connects to DB25 back panel con-
nector P17A to receive digital inputs (up to 12 lines). Four channels are for fan
speed monitoring
, and two for front and back door monitoring. Six additional
switches can be connected as required.
Temperature Sensing – There are three temperature sensing thermistors (ambi-
ent,
HPA compartment and SPU) connected to terminal board 3 (TB3). The pro-
cessor provides +5 VDC to each thermistor and reads the temperature from -55˚C
to + 180˚C of each thermistor. The TB3 connections to the processor are via DB9-
F panel connector P7B.