Specifications

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ACS253A-CT

Appendix D: Video Modes and Frame Rates

Table D-1 (continued). Supported video modes and expected frame rate.

Video Mode

Visible Resolution Clock Rates Frame Rate Fiber Frame Rate CATx

Pixels Lines

Horiz.

kHz

Vertical

Dt Ck

MHz hiCol loCol hiCol loCol

DMT127A 1280 960 75.0 75 126 25 25 15 25

VESA standard 1280 960 85.9 85 148 21 28 17 21

VESA standard 1280 1024 63.9 60 108 20 30 15 20

Sun mode 1280 1024 71.7 66 117 22 33 17 22

SXGA 1280 1024 74.6 70 129 23 23 14 23

SXGA 1280 1024 76.8 72 133 24 24 14 24

VESA standard 1280 1024 79.9 75 135 25 25 15 25

VESA standard 1280 1024 91.1 85 157 21 28 14 21

SGI 1600 1024 77.6 72 158 18 24 12 18

VESA standard 1600 1200 75.0 60 162 15 20 10 15

Frame Rates (FPS)

A DVI KVM Extender is not capable of transferring every frame generated by a graphics card because the net data rate of a

single-link DVI interface with 3.9 Gbit is much higher than the available transfer rate of the Extenders.

Transmission follows the following scheme:

• Starting with a recognized V signal, the first frame is digitized (on VGA) and temporarily stored (DVI+VGA) by the local unit.

• The data is transmitted, using the available net data rate, to the remote unit. During this time, frames generated by the graphics

card are discarded without any recognition (frame dropping).

• When data transfer is complete, the Extender system waits for the next VS signal.

Depending on the data volume (affected by the selected screen resolution/refresh rate), the type of transmission module and the

correspondence between the duration of the data transfer and a multiple of the refresh rate, you should get frame rates in a

range of approximately 15 fps up to the actual refresh rate of the graphics card.

NOTE: The frame rate counts the number of different pictures that are displayed in one second. The monitor is always driven with

the same refresh rate as generated by the graphics card or selected in the OSD.

The human eye is not able to discern more than 15 fps as single pictures. Your DVI KVM Extender is therefore suitable for

displaying streaming video in the highest resolution. To gain a higher frame rate, reduce the screen resolution—video normally

does not require higher resolutions.

NOTE: In higher resolution, the mouse pointer may show broken movement over the screen because of the reduced frame rate.

Use slower mouse movements for exact positioning.