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NSM-8×1AES/NSM-7×2AES Installation and Operation Manual
Preliminary—Contents are proprietary and confidential. Do not photocopy or distribute.
Chapter 1: Introduction
The NSM-8×1AES is configurable as an 8×1 with auto switch-over to
Input 1 if any of the inputs experience excessive errors or loss of signal.
The NSM-8×1AES/NSM-7×2AES monitors all inputs for coding errors
in the AES stream, which is known as biphase encoding errors. The
module also monitors all inputs for deterioration of the “eye pattern”
caused by transmission path effects, which is known as confidence
errors. If excessive biphase or confidence errors occur, or if the signal is
lost entirely, a signal presence error is reported for that input.
Switch Algorithm/Method
The NSM-8×1AES can operate manually or with one dedicated
automatic backup. The NSM-8×1AES router can be configured with
back-up functionality and operated in one of three modes of operation:
manual, return auto, and non-return auto.
•
In
manual mode
(NSM-8×1AES/NSM-7×2AES), you must switch
the router to the desired source regardless of signal presence. This
mode of operation is typical of other Leitch/Harris legacy routers.
There will be no automatic switching unless power is removed.
During a “No Power” condition, the signal on Input 1 will be routed
to the output. The router will return to the previous state upon
power restoration.
•
In
return auto mode
(NSM-8×1AES only), the router will
automatically switch to Input 1 if a signal presence error is detected
on the currently selected input. If the currently selected input is
Input 1 and it loses the signal, the output will be muted. If the signal
returns, the router will automatically switch back to its previous
source. The switch executes regardless of the signal presence status
on Input 1.
•
In
non-return auto mode
(NSM-8×1AES only), the router will
automatically switch to Input 1 if a signal presence error is detected
on the currently selected input. If the currently selected input is
Input 1 and it loses the signal, the output will be muted. The switch
executes regardless of the signal presence status on Input 1. In this
mode, the router will not automatically switch back to the original
source if the signal on the original input is detected again.
When you remove power from the router or remove the router front
main switch module from the frame, the output will automatically
switch to source 1 as the backup. When you restore power to the router,
it will automatically reset itself to the previous state.
Note
All conditions are available to
both the front edge control and
the Command and Control
System, including matrix status
and signal presence.
