Radyne QAM256 User Manual download pdf (Page 188)

User Manual

Chapter 11. Redundancy

Page 11-6 P/N 2349-72712-01

11.3.3. Device / Path Priority Dialogs

The Device / Path Priority dialog boxes can be found on the menu bar:

• For encoders, choose from the menu bar RedundancyàEncodersàDevice Priority…

• For Mux, choose from the menu bar RedundancyàMuxàPath Priority…

A priority value is set for each device in the group. A device used for redundancy purposes

should be assigned a very low priority value. An important device should be assigned a high

value.

Path priority is given to several devices on the same route such as a Mux and a Modulator

connected to an R-Switch. The Mux and Modulator device are considered as a path. In case

of malfunction in one of the devices, the NMS tries to find a different path. i.e. another Mux

and Modulator.

Figure 11-5 shows an example of a path in a system with a Mux and a Modulator. A path

priority contains several devices (unlike a device priority). The example shows that when Mux

0 is malfunctioned, Mux 1 and Modulator 1 replace Mux 0 and Modulator 0 even though

Modulator 0 is working properly.

Figure 11-5: Path example

Path

Encoder

Mux

Modulator

R-Switch

Path

Input

Output

Input

The number of priority levels equals the sum of the devices in the group, so that each device

could have its own priority number.

Each device or path has four parameters to configure (see Figure 11-6):

• Priority – A slider control that can be moved right for lower priority or left for higher

priority. The priority number is drawn on the side of the slider.

• Is Backed Up – a check box control. When checked - this device is backed up in case of

an urgent alarm.

• Is Backing Up – a check box control. When checked - this device can be used as a

redundant device in case of a malfunction in a higher priority device.

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Radyne QAM256 User Manual Page 188