10.1.3. Time Synchronization 
An exact time is required for many OpenScape 4000 functions (call
detail recording, time-dependent channels, night service, etc.). All
clocks in the system (up to 84) have to operate synchronously.
There are two ways of synchronizing the time:
- The IP network has a time server, which supports time synchronization of all OpenScape 4000 processors (the central processor and all survivability units) using the Network Time Protocol.
- A time server is not available in the IP network. The OpenScape 4000 platform then makes its local time available over the network for synchronizing all survivability units.
For more information on setting the date and time and the time synchronization
please refer to the documentation OpenScape 4000
V8, Installation, Configuration
and Migration, Installation
Guide.