User`s manual

VIDEO OVERVIEW
21
Digital Video Signal Path Overview
The Yosemite Family of digital video routing switchers are based on the same aforementioned
conventional “single stage” crosspoint matrix design. The signal path consists of four elements or
modules:
1. Input buffer
2. Crosspoint modules
3. Input / output sub-assemblies
Input Buffer
The input module assembly for each input of a Yosemite digital video router contains an automatic
adaptive cable equalizer and four differential, controlled-impedance, transmission line drivers. Each input
buffer consists of a small adapter module on the rear of the frame that is a combination 15 through 600
Mbps adaptive cable equalizer and fan-out distribution amplifier. The adapter accepts SDI data rates and
connects to the internal crosspoint sub-assemblies directly.
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 128x128 frame consists of four
sections of 32 inputs each. All digital Yosemite Family video routing switchers use the same input buffer
module.
The obvious advantage to having each individual input buffer mounted externally is for 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 64 of the
aforementioned input buffer assemblies and two 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.
Crosspoint modules
The motherboard design used in Yosemite video routing switchers incorporates a number of unique
design features. In the digital router, the motherboard provides a separate, very high-speed differential
transmission line to each crosspoint module in the system. This avoids any need for additional internal
distribution devices and allows all crosspoint IC’s in the system to be end-of-line terminations. This means
that there will be no high impedance internal stub connections that may cause reflections that often
equates to jitter problems.