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Kramer VP81KSI
8x1 Computer Graphics Video & Stereo Audio Step-In Switcher


The VP-81KSi is a high-performance analog step-in switcher for computer graphics video with resolutions up to WUXGA and unbalanced stereo audio signals.
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Kramer VP81KSI
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The VP-81KSi is a high-performance analog step-in switcher for computer graphics video with resolutions up to WUXGA and unbalanced stereo audio signals. The unit can switch any one of eight inputs to one computer graphics video, one unbalanced and one balanced stereo audio and one twisted pair output. The VP-81KSi works in conjunction with up to eight SI-1VGA Remote Control Step-in Modules.
  • High bandwidth - 440MHz (-3dB), CAT5 (Rec Out) up to WUXGA
  • HDTV compatible
  • Kr-isp Advanced Sync Processing - Ensures compatibility with a wide range of computers (even if the sync level is too low) by restoring the sync signal waveform.
  • Remote Step-In Switching - Up to 8 users, connected through SI-1VGA remote input/switching step-in modules, can each step in to switch the input to the local remote PC.
  • I-EDIDPro Kramer Intelligent EDID Processing - Intelligent EDID handling & processing algorithm ensures Plug and Play operation for analog systems.
  • Multiple unit cascade - Cascades up to 8 units to create a "virtual" switcher of up to 57 inputs.
  • Audio switching modes - Audio-Follows-Video (AFV) and audio breakaway switching.
  • Flexible control options - Front panel, remote step-in panels, RS-232 (K-Router™ Windows®-based software is included), RS-485, Ethernet via a built-in Web server, contact closure & IR remote (included).
  • Standard 19" rack mount size - 1U rack "ears" included


  • Inputs: 8 XGA on 15-pin HD (F) connectors, 8 unbalanced stereo audio on 3.5mm mini jacks.
  • Outputs: 1 XGA on 15-pin HD connector, 1 TP on RJ-45 connector, 1 unbalanced stereo audio on a 3.5mm mini jack, 1 balanced audio stereo on a 5-pin detachable terminal block.
  • Max output level: Video: 2Vpp; Audio: stereo unbalanced 7.8Vpp, stereo balanced 15.6Vpp differential.
  • Bandwidth (-3dB): Video: out 440MHz, CAT 5 (Rec Out) 150MHz; Audio: stereo unbalanced 20kHz, stereo balanced 20kHz.
  • Video resolution: VGA to WUXGA
  • Diff gain: XGA: 0.04%.
  • Diff phase: UXGA: 0.07Deg.
  • K factor: UXGA 0.2%
  • S/N ratio: Video: UXGA 68.3dB @5MHz; Audio: stereo unbalanced 74dB @1KHz, stereo balanced 74.4dB @1kHz; CAT 5 (Rec Out) 69.8dB.
  • Crosstalk: Video: UXGA –52dB @5MHz; Audio: local stereo unbalanced –73dB @1KHz, local stereo balanced <72dB @1kHz.
  • Volume control: Audio: stereo unbalanced -65.4 to 25.8dB; stereo balanced -59.4 to 31.8dB.
  • Coupling: Video: UXGA—DC, TP Out—DC; Audio: stereo unbalanced—In AC, Out DC, stereo balanced—In AC, Out DC.
  • Audio THD+ noise: Stereo unbalanced 0.08%, stereo balanced 0.08%.
  • Audio 2nd harmonic: Stereo unbalanced 0.001%, stereo balanced 0.001%.
  • Dimensions: 19” x 7.5” x 1U

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