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Section 5
Circuit Description
5-1. Circuit Description of Each Board
5-1-1. AT-195 Board
The AT-195 board consists of a system control microcomputer (IC001) and a peripheral circuit.
The main program is stored in the flash memory (IC401) on the AT-195 board.
This board is connected to the VIF-82 board.
5-1-2. CN-4131 Board
The CN-4131 board contains the RCP connector.
5-1-3. CN-4132 Board
The CN-4132 board contains the NETWORK TRUNK connector and the LAN COM connector.
5-1-4. FP-322 Board
The FP-322 board contains switches for setting menus, a USB connector, and an audio circuit for intercom on the front panel.
5-1-5. LE-436 Board
The LE-436 board contains LEDs on the front panel, indicating the camera number, optical signal receiving status, and various states.
5-1-6. LE-437 Board
The LE-437 board contains an LED that indicates the operating status of the unit.
5-1-7. NET-37 Board
The NET-37 board contains the LAN 1 connector (CN0201) and the LAN 2 connector (CN0202) for external communication.
The NET PLD1 (IC001) detects the SFP module connected to the LAN 1 or LAN 2 connector, and then informs the control
microcomputer (AT-195 board) of the detected module through CN0104. In addition, this IC sends/receives IP routing information
to/from the connected system controller (such as LSM) through the network, and then informs the control microcomputer (AT-195
board) of the IP routing information through CN0104. This IC also controls the network with commands sent from the control
microcomputer (AT-195 board) through CN0104 to transmit IP streams.
The NET1 PLD performs PTP communication with the connected PTP master through the network, and outputs the generated video
synchronization signal to the NET2 PLD (IC002). The NET2 PLD processes stream data using the video synchronization signal from
the NET1 PLD, and outputs the video synchronization signal to the VIF-82 board through CN0101.
The NET2 PLD converts the SDI signal (sent from the VIF-82 board through CN0102) to stream data, and then outputs the stream
data to the NET1 PLD. This PLD also converts the stream data from the NET1 PLD to SDI data, and then outputs the converted data
to the VIF-82 board through CN0102.
The NET1 PLD assembles stream data sent through the NET2 PLD as packet data for 10 G/25 G network communication.
This PLD also extracts stream data from received packets in network communication, and then outputs the extracted stream data to
the NET2 PLD.
5-1-8. SW-1775 Board
The SW-1775 board contains a switch for intercom.
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