Grass Valley iTX System v.2.6 - Manual (Page 307)

System resilience
When an operator creates or loads a schedule in a master channel, iTX loads a copy of the
schedule in the associated slave channel.
If the operator edits the schedule in the master channel, iTX updates the schedule in the slave
channel so that it matches the one in the master channel; it does this after a short delay (about
30 seconds) to allow the operator to correct any editing errors.
The schedule in a slave channel cannot be edited directly.
The Schedule Grid on the Channel Control layout displays a label that shows whether a selected
channel has master or slave status.
If the option to produce an as-run log is selected for the channels, only the master channel
writes the log.
Failover of an Output Server
Depending on how you set up your system, iTX may respond to a failure of the main Output
Server in one of two ways:
• It may automatically route the back-up Output Server instead of the main Output
Server to the transmission system.
• It may wait for a manual command before routing the back-up Output Server to the
transmission system.
For control of the router through iTX, the system must include certain routing services. When
these services are running, you may manually operate the router from one of the system-
administration layouts.
Where iTX does not control the router, you may manually operate the router through a third-
party control panel, or you may use a signal-detection device to perform the task automatically.
Use of a dummy router to identify the master channel
When iTX is set up to operate a matrix router, it monitors the router operations and
automatically detects which channel is the master channel.
For a system in which routing happens outside of iTX control, iTX needs another way of finding
out which is the master channel. For this, you need to set up a dummy router. This is a software
application that provides routing status information to iTX. The information relates to
crosspoints that you configure in the dummy router: sources for the main and back-up Output
Servers; a destination for the transmission system. More details , page 329.
You can use router-control buttons on a system-administration layout to operate the dummy
router so that the routing status of its crosspoints matches those of the real router. For
example, on the dummy router, you may route the back-up Output Server source to the
transmission-system destination.
By monitoring the status of the dummy router, iTX determines which is the master channel.
Prepare the back-up Output Server cache
1. Ensure the cache partition for the back-up Output Server is separate to the machine C-
drive and uses the same drive letter (for example, D:) as the cache partition on the main
Output Server.
March 2015 System Administrator Guide Page 307 of 404