ECO 422
1–1
Getting Started
Product Description
The ECO 422 Changeover Unit (Figure 1–1 and Figure 1–2) provides automatic
selection of reference sources. Automatic changeover may occur upon fault
detection in any active source. Automatic transfer ensures uninterrupted signals
for critical applications. The ECO 422 is an in-line device without internal
buffers. Switching is by mechanical relay. The ECO 422 also provides internal
termination for unused inputs.
There are 11 identical channels. Each consists of a Primary Input, a Backup
Input, and an Output. All relays switch in unison upon fault detection in any
active channel, front-panel command, or remote command.
The ECO 422 bases error checking on signal amplitude. You can configure each
channel to check for a different type of input. There are six predefined checking
levels: no checking, PAL analog black burst, NTSC black burst, serial digital
component video, NTSC serial digital composite video, and serial digital audio.
A fault occurs when the signal is between 2 and 4 dB (or 2 and 5 dB) down from
nominal for these predefined signals. There are also two user-defined checking
thresholds available.
Separate indicators on the front-panel display faults for both the primary and
backup generator. These indicators remain on until cleared by the operator.
Figure 1–1: Front of the ECO 422
Figure 1–2: Rear of the ECO 422
Summary of Contents for ECO 422
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