VX-400/288R
The VX-400/288R Crosspoint Card contains circuitry to control a 288 x 288 switching array based on commands from the MX-BUS, power supply circuitry and alarm reporting circuitry.
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The VX-400/288R Crosspoint Card is the central component in the 12 RU 288 x 288 UTAH400 router. It contains circuitry to control a 288 x 288 switching array based on commands from the MX-BUS, power supply circuitry and alarm reporting circuitry. It also has locations for two optional plug-on modules, a TDM Audio Crosspoint and a H.264 streaming 2 Monitor Matrix card.
Circuit Description
The upper end of the card is the power supply section. U1 is a redundant power supply switch that determines which of the two -48V power supply inputs is most healthy, and directs that supply to its output for the rest of the board to use. From there, the supply is filtered by U4 and presented to U1, which converts it to 3.3VDC at 50 amps.
This 3.3V supply is further regulated down by U24, U5 and U3 to 2.5V at 1.5A, 1.8V at 10A and 1.2V at 40A. U12, at the board front edge, measures and determines the health of each of these lower supplies, and will generate alarms if any are faulty. DS7, a Green LED on the board front edge, lights when all supplies are good.
The lower end of the card contains all of the control circuitry on the board. This consists mainly of U17, a 16-bit DSP, and U18, an FPGA. U18 receives commands from the external MXBUS and switches the crosspoint chip appropriately, while U17 monitors the health of the board and reports that back to the system level Frame Controller Module for reporting to the external world.
The video switching core of the system is in the center of the board, U13, which is a 3.2Gb/Sec 288 x 288 crosspoint chip in a 2398 ball BGA package. It is covered by a large heat sink. It receives the 1.2V and 1.8V rails from the power supply section, a 30-bit control bus from U18, and 288 inputs from video input cards and drive 288 video outputs to output cards.
The monitor matrix is made up of U7 and U15, which are both 12 x 12 3.2Gb/Sec crosspoint chips. These receive signals from the 24 output cards in the system and generate three different output signals: two for the copper MMX outputs and one that goes to the streaming (optional) monitor matrix module.
Controls and Indicators
Controls:
SW1 – Momentary push button reset switch. Resets all processing on the card.
SW2 – 8 Position Dipswitch. Used for board programming and custom settings.
J15 – Header for connection of a JTAG pod for programming the FPGA.
J17 – Header for programming the DSP, from a PC parallel port. P1 – Used for serial diagnostics of the card from a RS-232 port.
P2 – Serial diagnostic header for the streaming (optional) MMX module.
Indicators:
DS1 – Reclocker locked indication for MMX out 1. – Green.
DS2 – Reclocker locked indication for MMX out 2 Green.
DS3 – Reclocker locked indication for streaming (optional) MMX output. – Green.
DS4 – 1.2 or 1.8V failure indication. – Red.
DS5 – 2.5V failure indication – Red.
DS6 – 3.3V failure indication – Red.
DS7 – Power Supply OK indication – Green.
DS8 – Health Indication – Red. On if there is a problem.
DS9 – Comms from FCM indicator – Yellow.
DS11 Comms to crosspoint chip – Green. On if OK.
DS12 – Power Supply OK LED – Green.
DS13 – Seating LED – Indicates that the crosspoint card is correctly installed in its slot when Green.
DS14 – FPGA programming complete – Green.
DS15 – Scangate active LED – Yellow.
