A clock reference is needed to synchronise the PRI or BRI frames.
If the clock reference is not configured according to the network environment, the clock will
slip and voice quality may degrade.
The clock reference can be generated internally or obtained from an external source (e.g., PRI
or BRI telephony provider). If you have an interface connected to a PRI or BRI telephony
provider, the clock reference must be selected from the DGW Web interface. The clock reference
provides error-free data and fax transmission. The clock reference may either be provided by the
network or by one of the BRI, PRI, or Sync port of the Mediatrix unit.
The Mediatrix 3000 has a TDM for each card. Therefore, each extension card can be configured to
use a different source for the Clock Reference. This means that depending on the telephony ports
being used, up to two Clock Reference sources can be used simultaneously on the Mediatrix 3000
Series units. All other Mediatrix units have only one TDM, therefore only one source for the
Clock Reference can be used at a time. Fallback can however be configured on all Mediatrix units
with a PRI, BRI, or external Sync port, since in this case, only one Clock Reference source can
be used at a time.