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22 = Hardware Interface
Rear Panel Features
Video Inputs
The Image Server provides a single video input channel. This channel includes separate BNC
inputs for serial digital (“SDI” per SMPTE 259M) and analog video (CVBS) signals. The graphic
user interface allows selection between the two. Encoding to MPEG-2 format is performed
within the server. Video inputs have a fixed 75-ohm termination.
Video Outputs
Video outputs are provided in SDI and Composite (CVBS) formats simultaneously. Digital
video appears in SDI format at 270 Mb/s and conforms to SMPTE 259M. Analog video is in
conventional composite (CVBS) format.
Video Output 1 can superimpose time code over picture as a “window burn” on NTSC models.
This feature is available only on the CVBS video output, and is enabled through the On-Screen
graphic user interface.
Audio I/O
The Image Server can provide audio inputs and outputs in three formats:
• Balanced analog audio at the industry-standard reference level of +4 dBu.
• Digital audio in AES/EBU format per AES-3-2000.
• SDI embedded audio, 4-channels (server option)
These multiple standards facilitate the transition from an analog studio to digital production and
broadcasting, and ensures that the server can operate with virtually any external equipment.
Note that both analog and AES/EBU audio signals are not available at the same time on a given
input or output. Internal jumpers select between analog or digital; however, input and output
can be set up differently, if desired. A set of XLR-3 connectors allows high-quality connections
to be made in either format. Embedded audio, when installed as a server option, appears in the
SDI output at all times.
Analog Audio Capability
When the analog audio input format is selected, each video channel has two audio
channels, recorded together as a stereo pair. Trimmers allow adjustment to unity gain.
Digital Audio Capability
When AES/EBU digital audio is selected, each video channel has four audio channels, which
are recorded as two stereo pairs. Because a single XLR connector carries a stereo pair in
digital format, and only one (mono) channel in analog, the server provides an extra pair of
audio channels when used with digital audio signals.