PCM sync source sets the S0-bus used as a clock by the Call Manager.
    Important: This setting is relevant if you use a bus internally and the second bus is connected externally (e.g. to a connection from the ISDN provider). In this case, you should use the external connection as the clock. With the setting Auto the device selects the bus by itself.
- SNMP ID:
 - 2.23.19
 - Console path:
 - Setup > Interfaces
 - Possible values:
 - Auto
 - S0-1