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8900NET Instruction Manual 63
Functional Description
ROM and RAM
Software updates can be made to the 8900NET ROM through the Web-
based interface. Non-volatile RAM is provided to store key setup values
when power is cycled.
Ethernet Port
The 10Base-T Ethernet port provides configuration and monitoring access
to the frame, frame modules and the 8900NET module using a Web
browser.
RS-232 Serial Port
The RS-232 port is used to initialize the module with critical network
parameters including a static assigned IP Address. Ethernet MAC address
is stored on a serial EPROM on the frame. (The frame needs both MAC and
IP Addresses.)
Module Health Bus
The Module Health bus connects all the audio/video module cells to the
microprocessor. It is used to report module faults or data errors.
Frame Bus
The Frame Bus provides serial communication to each of the audio/video
modules for remote configuration and monitoring over a network.
Module Present Detection
Module Present lines from cells 1 through 10 and Present/Health lines
from cells 12 and 13 are monitored by the microprocessor using the Module
Present Detection circuitry. For cells 1 through 10, this circuit reports to the
processor whether a module is present and if it supports frame bus com-
munications (control and monitoring). For cells 12 and 13, this circuit
reports if the power supply is present and if it is working properly.