Ensemble Designs 9455 3G Clean and Quiet Protection Switch - Manual (Page 5)

www.ensembledesigns.com 7435 and 9455 - page 5
Model 7435 and 9455 Clean and Quiet Protection Switches
Module Overview
The 9455 and 7435 modules are clean and quiet protection switches for critical broadcast and satellite
feeds. They switch cleanly between asynchronous sources which means they can be used live to air.
Each module has a full video frame synchronizer, rather than a line delay, ensuring perfect alignment
of mis-timed and non-synchronous SDI sources. The 7435 supports 1.5 Gb/s HD SDI and SD SDI signals.
The 9455 additionally supports 3 Gb/s HD SDI.
When a fault is detected in the primary input, and the secondary input is verified as good, the switch
will activate, causing the secondary input to be switched cleanly and quietly to the module’s output.
The 9455 and 7435 include fail-safe bypass which connects the primary input directly to one module
output. This passive, fail-safe path ensures that there is an output even in the event of a total
power failure.
Clean and quiet switching between sources requires that the sources be synchronous and precisely
timed to each other. The 9455 and 7435 accomplish this automatically, with integral frame
synchronization of the inputs, allowing operation with both synchronous and asynchronous (wild)
sources. This frame synchronization feature not only means that the output will always be stable and
glitch-free, but it also means that in the event of a total loss of both inputs, consistently timed color
black will still be output.
The internal frame synchronizers can be genlocked to an external reference signal so that the
output of the 9455 or 7435 is synchronous to local sources. Alternately, in teleports, headends, and
other multi-service facilities, where there is no logical common reference, the module will internally
generate an accurate reference.
The delay through the 9455 or 7435 can be adjusted up to six frames, with independent control for
the primary and secondary input paths. By operating with several frames of delay, the fault detection
algorithms are given enough time to detect a failure in an input signal and switch to the backup
before the fault has actually appeared on-air.
Different types of signal testing (vetting) can be enabled on the module. This happens automatically
and independently for the primary and secondary inputs. The health of the video signal is determined
by monitoring crucial parameters in order of increasing complexity; Timing Reference Signal (TRS), or
a persistent loss of digital sync is tested first. Black, Embedded Audio and Freeze are also evaluated.
Each test can be configured by the user. For example, the sophisticated Black Detector includes
configurable parameters for black level threshold, pixel count, and duration time.
The Freeze detection system can be set to detect a clean or noisy source. Freeze Time sets the number
of seconds for the 9455 or 7435 to switch to the secondary input after a video freeze condition is
detected in the primary input.
The switch can operate in two modes: automatic or nonresetting. In fully automatic mode, the module
will automatically switch back to the primary signal once it’s been restored. In the nonresetting mode,
the secondary input remains routed to the output, even after the primary input has recovered. In this
case manually switching back to the primary is required. If no valid input can be found, consistently
timed color black will be output.
Controls are easily accessed through an Avenue Control Panel, Avenue PC software, GPIs, or front edge
module controls. Software updates for the module are done through a web browser via Ethernet using
the Interface Adapter Cable that comes with the module. This cable provides an Ethernet connection