Circuit Emulation Interface Clocking Features

All Circuit Emulation PICs support the following clocking features:

• External clocking—Also known as “loop timing”. Clock is distributed via the TDM interfaces.
• Internal clocking with external synchronization—Also known as “external timing” or “external synchronization”.
• Internal clocking with PIC-level line synchronization—Synchronizing the PIC’s internal clock with a clock recovered from a TDM interface local to the PIC.

This feature set is useful for aggregation in mobile backhaul applications.

Note: The PRS of the clock recovered from one interface may not be the same as that of another TDM interface. There is a limitation on the number of timing domains that can be supported in practice.

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