1.539 Protection-Switch-N-To-M

The Protection-Switch-N-To-M logical device builds together with a set of protection controller devices a n:m redundancy solution for satellite modulators, downconverters etc.

This solution supports a pool of backup devices from which one device is taken in case of failure of an operative device. In case of a redundancy switch all parameters are mirrored to the spare device.

Actually there are two typed of protection controller devices available:

• Modem-Protection-Controller for satellite modulators which fieed their signals into a crosspoint oriented switch matrix and select their input signal from a network stream.
• Downconverter-Protection-Controller for downconverters which get their input signals from a distributive switch matrix and send their output signals to another distributive matrix.

The devices managed by Protection-Switch-N-To-M device must be all of the same type, to make an 1:1 parmeter mirroring to the spare device work properly, the manufacturer and model type should also be the same

For n:m redundancy, one Protection-Switch-N-To-M device and for each managed modulator a protection controller device are configured in the M&C device setup. This distribution across two device types enables a very flexible configuration of the redundancy, so there is no explicit limit on the number of managed modulators.

The Protection-Switch-N-To-M device, as the central instance of the redundancy switch, manages the pool of modems (which are operational, which are spare). It defines the name of the switching matrix that routes the outputs of the modulators as well as parameters shared by the modem protection controller devices as configuration parameters.

The device's operational parameters are:

• Global protection ON/OFF
• Global status display in the form of a multi-line text field that summarizes the configuration and current status of all modulators involved.

Device window pages

The following table shows which device window pages are available with this individual device type. Tool-bar functions not mentioned here are described at the general description of device windows .

• --- This page controls the operational parameters of the device.
• --- The faults page. --- The device info page.
• --- The maintenance page. The configuration parameters described below are set at this page.

Configuration parameters

At the maintenance page of the device window there is one configuration parameter which must be set to interconnect the redundancy switch with the devices it shall monitor and control.

Variables defined by this device driver