Dolby Installation Guidelines
Chapter 4
Hot Standby and Alarms
Many Dolby products allow simple implementation for hot standby applications. Hot standby units and redundancy should be considered at a system level. Systems that utilize hot standby features allow automatic routing of the required signals from a unit that develops a fault, to a spare unit in the system. The Dolby products can easily be integrated into other redundant systems, such as the “n+1” design that is often used for transmission encoding. In such a system, the only signal that would require routing for the audio is a single Dolby E stream. Operating status of the units can be assessed by the control using the GPI/Os.
4.1DP562
The DP562 features general system alarm and
4.2DP563
There are no GPI/O ports on this unit. However, the DP563 will only stop encoding if there is no valid audio input on channels 1/2 or if there is a hardware fault.
4.3DP569
The DP569 has a bypass input that can be used to make hot standby operation simple. In order to connect a pair of DP569s for hot standby connection, the following connections should be made.
The unit automatically enters Bypass mode when an internal fault occurs or when power is lost. Bypass mode can also be selected from the I/O Control menu or via the GPI/O input port.
