Sierra Video Yosemite - Manual (Page 24)

SIERRA VIDEO
18
Input Buffers
Each input buffer consists of a small adapter on the rear of the frame that converts the 75 ohm analog
video input into a buffered, very low impedance load (under 5 ohms). Each adapter module contains a
400 Mhz linear circuit. The signal is distributed via a PWA (“Printed Wiring Assembly,” also known as a
circuit board) motherboard to the crosspoint matrix portion of the router.
The 64x64-frame assembly consists of two sections. Each of these sections has 32 input buffer
assemblies and a motherboard which distributes the video signals. The 96x96 routing switcher consists of
three sections of 32 inputs each; the 128x128 frame consists of four sections of 32 inputs each. All
analog Yosemite Family video routing switchers – including wide bandwidth systems – use the same
input buffer adapter.
The obvious advantage to having each individual input buffer mounted externally is easy maintenance.
Changing an individual input buffer does not require powering the system down, nor does it require
unsafe internal repairs. Please consult SVS Customer Service before moving any of the input buffers.
Oftentimes Yosemite routing switchers are ordered with future expansion in mind. For example, a
128x128 frame can be ordered and configured with only 64 inputs and 64 outputs, requiring only 2 of the
aforementioned input buffer assemblies and motherboards. In these cases, the input buffers will be wired
for the customized configuration, possibly changing the input number as indicated on the frame. Do not
move any of the input buffers installed by the factory
without contacting SVS Customer Service. This
may disrupt system performance if wired incorrectly.