Grass Valley Profile XP Aug 16 2004 - Manual (Page 40)

Chapter 1 Introducing the Profile XP Media Platform
40 Profile XP System Guide 23 July 2004
Real Time Subsystem
The Real Time Subsystem includes the following components:
Real Time System
The Real Time System board contains a real time processor and peripheral devices. A
second generation of this board, Real Time System II, is now used for all Profile XP
models. The RTP-II board requires Profile System Software v. 5.0 or higher. This board
manages all the hardware involved in controlling the flow of video, audio, timecode in
and out of the system. This includes video I/O boards, audio I/O boards, video
compression boards, and networking and storage. Other board functionality includes:
• Generation of system clocks for SD (27MHz) and HD (either 37.0879 or 37.125
Mhz)
• Generation of frame reference pulses
• Ability to lock system clocks and frame reference pulses to tri-level sync or to
NTSC/PAL bi-level sync (reference video input).
• LTC In reader and LTC Out generator.
• VITC reader for reference video input.
• GPI (8 In, 8 Out)
• Black generator and Colorbar generator used for loss of input or output video
conditions (SD only).
Serial Digital Video Boards
These boards provide four serial digital video (270 Mb/s SMPTE 259M), either
2In/2Out or 4 Out, through four BNC connectors on the rear of the board. An internal
frame buffer is provided for each video input on the board for auto-timing synchronous
and asynchronous inputs. Embedded audio is supported — maximum of 8 channels
audio per video input— and is routed over the video routing fabric. VITC can be read
from each input and generated on each output.
High Definition Serial Digital Video Board
This board, through four BNC connectors, provides one SMPTE292M serial digital
video input, one SMPTE292M serial digital video output, a standard SDI (SMPTE
259M) output, and a composite analog NTSC or PAL monitor output. The HD-SDI
board can function as both input and output if AES/EBU audio is in use, but when
embedded audio is used, the board functions either as input or output but not both. The
output on the standard SDI port and monitor port is down-converted from the high
definition output signal. The composite analog monitor output includes Text Overlay
and Timecode burn-in.
Serial Data Transfer Interface (SDTI) Board (optional)
This board provides two SDTI channels, each with an input and an output BNC
connector. From the compressed video at the input, this board extracts video and audio
data and sends it to the media storage subsystem. At its output, this board provides
formatted video and audio data retrieved from the media storage subsystem.