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62 8900NET Instruction Manual
Functional Description
Functional Description
Refer to the block diagram in Figure 37 while reading the following func-
tional description.
Figure 37. 8900NET Block Diagram
Temperature Sensing
Two temperature sensors on the module report to the microprocessor when
they detect:
• External ambient temperature above 50° C, or
• Internal frame temperature above 70° C.
The microprocessor will then report a temperature fault.
0612-01
Alarm
Bus
Boot ROM
SDRAM
NVRAM
Temperature
Sensing
SMPTE
Alarm
Signal
Processing
Microprocessor
+12 V
+5 V
+3.3 V
Ethernet/MAC Address
SMPTE
Relay
RS-232
Driver
On-board
Regulator
Module Cells
Frame Bus
Fan Speed
Control and
Rotation
Sensing
To Fan Assembly
SMPTE Alarm
(BNC)
Module Health Bus
Module
Present
Detection
Power Supply
Cells
Ethernet (RJ-45)
RS-232 (9-pin D)
10BaseT Ethernet
User
Setup
Sw.
User
Setup
Sw.
LEDs
M
o
t
h
e
r
b
o
a
r
d