Grass Valley 8949MDA-CFR v.1.1.X - Manual (Page 44)

44 8949MDA-CFR/-SFR—Instruction Manual
Functional Description
Output Processing
The SDI driver modules feed the outputs ensuring the rise and fall time
adjustment between format selection (SD or HD mode) on the DA outputs.
After the downscaling, in a SDI module, the HD to SD downscaler module
directly feeds the SDI driver module which supplies the signals to the out-
puts.
After the downscaling, in a composite module, the downscaler module
feeds the composite encoder which converts the signal in a PAL or NTSC
signal before giving it to the output amplifier module to the outputs.
Microprocessor
The main functions of the microprocessor include:
• Providing remote control and monitoring capability for the module
(through ethernet),
• Communicating with equalizer IC to monitor signal present status,
reclocker IC and downscaler module to support status and signal infor-
mation,
• Relaying module status through on-board LEDs, and
• Configuring module components at power up.
Power Supply
Power is fed from +12 V rails of the frame’s switching power supply. Each
stage of the module receives its own, separate, highly regulated and filtered
power source. The power input is protected by hot swap function which is
an electronic circuit breaker that detects an overcurrent condition.