Ross openGear GPI-8941 Series, User Manual

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GPI-8941 Series User Guide (v9.0) Glossary • 91
Glossary
The following terms are used throughout this guide:
Active image — the portion of the video picture area (production aperture) that is being utilized for output content.
Active image excludes letterbox bars and pillarbox bars.
Card — openGear terminal devices within openGear frames, including all components and switches.
CBR — constant bit rate.
CDN — content distribution network.
Contact closure output — a two-terminal output in which both terminals are isolated from ground, and which
provides either an open or closed circuit between the two terminals to signal two states.
DashBoard — the DashBoard Control System.
Dry — a GPIO input/output circuit that does not apply any voltage to its terminals, relying instead on current
provided by another wet GPIO connected to it.
DTVCC captions — CEA-708 captions.
Frame — the OGX-FR frame that houses the GPI-8941.
GPI — a general purpose interface.
Isolated input — a two-terminal input circuit in which both terminals are isolated from ground and which is
activated by a current flowing through the two terminals.
MIB — management information base.
Network Controller Card — the MFC-OG3-N or MFC-OGX-N and any available options unless otherwise noted.
NTSC captions — the CEA-608-D: Line 21 Data Services captions.
openGear frame — refers to the OGX-FR series frames unless otherwise noted.
PAL — PAL-B and PAL-G unless otherwise stated.
PCR — program clock reference.
PID — packet identifier.
Production aperture — the image lattice that represents the maximum possible image extent in a given standard
(e.g. the full size of all active pixels and active lines). For example, the 1080i production aperture would be
1920x1080.
Pull-to-ground input — a two-terminal input circuit in which one terminal is grounded. The other terminal is at a
high logic level when open, and can be externally connected to ground to assert it low.
System — the mix of interconnected production and terminal equipment in your environment.
TCP — Transmission Control Protocol.
User — the person who uses the GPI-8941.
Voltage source output — a two-terminal output in which the two logic states are defined by either an open circuit
or a DC voltage between the two terminals, one of which is connected to ground.
Wet — a GPIO input/output circuit that applies a voltage, and can therefore source a current through an
interconnection to another device.
Wetting voltage — the voltage that is injected into an interconnection, normally by one device.