TDM Bus Clock Settings

In a traditional TDM service network such as PSTN, both ends of the TDM connection must be synchronized. If synchronization is not achieved, voice frames are either dropped (to prevent a buffer overflow condition) or inserted (to prevent an underflow condition). In both cases, connection quality and reliability is affected.

PSTN line clock (see Recovering Clock from PSTN Line)
Internal clock (see Configuring Internal Clock as Clock Source)

When the device is used in a ‘non-span’ configuration, the internal device clock must be used (as explained above).