Grass Valley XSwitch Feb 08 2006 - Manual (Page 8)

8 XSWITCH Installation and Operation Manual
Section 1 — Introduction
can be any type, such as RS232, RS422, RS485, etc. This card does not
support extremely high-speed signal switching such as Ethernet. The
actual contact exchange occurs within 6 ms maximum, including settling
time.
SDI (Video) Switching
The SDI (Serial Digital Interface) Switch Card is an active re-clocking, cross-
switching device (
Figure 1 ) with standard BNC-type I/O connectors. Two
digital-video inputs are switched between two digital-video outputs. For
example, an SDI signal from system A is fed to the switch card and from
there to digital monitor A. An SDI signal from system B is fed to the switch
card and from there to digital monitor B. When switched, system A is con-
nected to monitor B and system B is connected to monitor A. No signal
paths are left without termination except during the actual switching event.
The actual contact exchange, including settling time, is a maximum of 6 ms.
Figure 2. Video XSWITCH Card
Audio Switching
The Audio Switching Card is an active switching device ( Figure 3 on
page 9 ). It fully buffers all signals and is a pop-free cross-switch. It uses
active balanced inputs and outputs. The I/O connectors are 3 pin XLR type.
They are wired with pin one at circuit ground, pin 2 hi and pin 3 lo. The
input impedance is 2K Ohm. The output impedance is 600 Ohm. In a
typical application audio source A is input at input A and taken from
output A to a receiving device. A second audio source is input at input B
and taken from output B to a second receiving device. When switched,
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Destination B
Video XSwitch
Destination A
Source B
Source A
Normal Path
Switched Path