- Thomson Digital Technology Co. Ltd. Network Interface Module Instruction Manual

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.