Dolby Laboratories S01/13621 - Manual (Page 31)

Dolby Installation Guidelines
4-1
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.
4.1 DP562
The DP562 features general system alarm and AC-3 decoding status signals as
outputs on the status/remote port. For further details of the connections of this port,
see Section 2.2.2.
4.2 DP563
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.
4.3 DP569
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.