VX-400/144R
The VX-400/144R Crosspoint Card contains circuitry to control a 144 x 144 switching array based on commands from the MX-BUS, power supply circuitry and alarm reporting circuitry.
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The VX-400/144R Crosspoint Card is the central component in the 7 RU 144 x 144 UTAH400 router. It contains circuitry to control a 144 x 144 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 3 Monitor Matrix card.
Circuit Description
The upper front of the card is the power supply section. U3 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 U2 and presented to U1, which converts it to 3.3VDC at 50 amps. This 3.3V supply is further regulated down by U15, U14, and U13 to
2.5V at 3A, 1.8V at 10A and 1.2V at 10A. U4, at the board front edge, measures and determines the health of each of these lower supplies, and will generate alarms if any are faulty. DS11, a Green LED on the board front edge, lights when all supplies are good. (The streaming output is optional.)
The center front of the card contains all of the control circuitry on the board. This consists mainly of U9, a 16-bit DSP, and U11, an FPGA. U11 receives commands from the external MX-BUS and switches the crosspoint chip appropriately, while U9 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, U21, which is a 4.25 Gb/sec 144 x 144 crosspoint chip in a 1156 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 U11, and 144 inputs from video input cards and drives 144 video outputs to output cards.
The monitor matrix is made up of U20, which is a 12 x 12 3.2Gb/Sec crosspoint chip. It receives signals from the 12 output cards in the system and generates 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:
SW3 – 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.
J1 – 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:
DS15 – Reclocker locked indication for MMX out 1. Green.
DS14 – Reclocker locked indication for MMX out 2. Green.
DS13 – Reclocker locked indication for streaming (optional) MMX output. Green.
DS9 – 1.2 or 1.8V failure indication. Red.
DS10 – 2.5V failure indication. Red.
DS8 – 3.3V failure indication. Red.
DS11 – Power Supply OK indication. Green.
DS1 – Health Indication. Red. On if there is a problem.
DS2 – Comms from FCM indicator. Yellow.
DS4 Comms to crosspoint chip. Green. On if OK.
DS5 – Power Supply OK LED. Green.
DS6 – Seating LED – Indicates that the crosspoint card is correctly installed in its slot when Green.
DS7 – FPGA programming complete. Green.
DS12 – Scangate active LED. Yellow.
