3 Overview 
The VS-88HD is an HDTV compatible high performance matrix switcher for 
HD-SDI and SDI digital video signals. It lets you simultaneously route any of 
the eight inputs to any or all of the eight outputs. Switching during the 
vertical interval ensures glitch-free switching with genlocked sources. In 
particular, the VS-88HD features: 
Input and output signals on BNC connectors 
A looping analog sync input with selectable sync signal termination 
Switching synchronization, letting you synchronize to either the 
external reference or incoming video 
Automatic reclocking and equalization on each input 
Each input button on the front panel automatically lights up when 
the VS-88HD detects a video signal on that input 
Switching according to the Bi-level or Tri-level Genlock input 
The storing and recalling of setups 
A Take button for the execution of multiple switches all at once 
A 7-segment display 
The VS-88HD, which is housed in a 19" 1U rack mountable enclosure, and is 
fed from a 90-240 VAC universal switching power supply, can be controlled 
via the: 
Front panel buttons 
Remotely, by RS-232 or RS-485 serial commands transmitted by a 
touch screen system, PC, or other serial controller 
To achieve the best performance: 
Connect only good quality connection cables, thus avoiding 
interference, deterioration in signal quality due to poor matching, and 
elevated noise levels (often associated with low quality cables) 
Avoid interference from neighboring electrical appliances that may 
adversely influence signal quality and position your Kramer VS-88HD 
away from moisture, excessive sunlight and dust 
4 Your VS-88HD 8x8 SD/HD-SDI Matrix Switcher 
Figure 1, Table 1, and Table 2 define the VS-88HD 8x8 SD/HD-SDI Matrix 
Switcher.