Dolby Laboratories DM100 Manuel d'utilisateur télécharger pdf (Page 25)

Dolby Model DP583 Frame Synchronizer User’s Manual Applications

3-5

DP583 Primary Unit

Synchronization

Processing

Main

Input

Bypass Input

Main

Output

Synchronization

Processing

Main

Input

Bypass Input

Main

Output

DP583 Standby Unit

Audio

Input

Audio

Output

Figure 3-5 Hot-Standby Operation of the DP583

The unit automatically enters Bypass mode when an internal fault occurs or when

power to one unit is lost. Bypass mode can also be selected from the I/O Control

menu or via the GPI/O input port.

For further security, pins 5 and 9 (ground) of the GPI/O ports can be used to control a

unit fault alert. If pin 5 goes “low,” then a hardware fault has occurred. These can be

used on both units so that a faulty standby DP583 can be identified before it is

required. Pins 2, 3, 4, and 8 can also be used to ascertain whether the unit is

producing an invalid output, and to trigger a warning.

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