Moog Focal 903, Руководство пользователя

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903-0628-00 Rev. 1 Model 903-HD User's Guide – FMB-X-2.5
Focal Technologies Corp. Page 4-2
4.1 High Density Board (HDB-TX)
Card P/N 903-5006-00 (Remote Only)
The remote high density board (HDB-TX) provides interfaces for four video channels, four dedicated RS-232
channels, and four adaptable interface board (AIB) plug-in modules, which are available for a variety of
signals, including RS-232, RS-485/422, Tritech ARCNET, hydrophones, CAN bus and analog sonars. Video
channels are unidirectional, originating at the remote module; data channels, other than hydrophone signals,
are bidirectional.
4.1.1 Video Channels
Each HDB-TX card provides inputs for four standard NTSC or PAL composite video signals brought in
through the front panel SMB connectors shown at the top of the panel in the figure below. Video inputs should
be standard video levels, typically 1.0 to 1.2 Vpp. Signals will start to clip at 1.4 Vpp, and absolute maximum
levels are 3 Vpp. Input bandwidth is limited to 6 MHz by anti-aliasing filters. All video inputs are capacitively
coupled and protected by transient voltage suppression diodes. External isolation transformers may be used
to galvanically isolate the video, but may cause degradation of video quality. The digitizers sample at a fixed
frequency of 15.625 MHz with 10 bits of resolution to achieve video transmission quality exceeding EIA-250C
end-to-end specifications.
Figure 4-1: Remote High Density Board (HDB-TX) – Front Panel
Notes:
1. All four video channels are configured for composite video support.
2. Dip switch SW1 must have all switches off (default configuration for composite video).