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Chapter 2 - Technical Information
© Polycom, Inc. 15
The following table gives electrical specifications for the video
inputs and outputs.
The following table gives other video specifications for the
ViewStation EX, ViewStation FX, and VS4000 systems.
Table 2-5. Video Input/Output Electrical Specifications
Parameter Value/format
Impedance 75 Ω
Signal amplitude 1.0 V
pp
typical
Coupling DC
Table 2-6. Video Resolution, Frame Rate, and Error Correction
Parameter Value/format
Video format NTSC or PAL
Video resolutions QCIF (176 x 144)
CIF (352 x 288)
4CIF (704 x 576)
TV-quality wide-screen (letterbox)
Graphics
resolutions, slide
transmission
H.261 mode: 4CIF (704 x 576)
H.263 mode: 16CIF (1408 x 1152)
Graphics resolution,
local display
up to 1280 x 1024
Frame rate NTSC: 30 frames/second
(60 fields/second)
PAL: 25 frames/second (50 fields/second)
Error correction Polycom Video Error Concealment (PVEC)
a
a. PVEC is activated and deactivated automatically, as needed.
Video quality degradation with the PVEC feature active may
indicate that your IP network is not functioning properly. At the time
of publication, PVEC is not available in dual stream mode or
standards-based 60-field video.