Functional Description
ATCA-F140 Installation and Use (6806800M67H
)
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4.11.2 BIT/SSU Support
Many offices where the ATCA-F140 is likely to be deployed includes a central Building
Integrated Timing Supply (BITS) or Source Synchronization Unit (SSU).
A BITS is typically an output-only device that provides a precision timing reference, known as
the T[3] clock, to shelf-level products that use this for synchronizing the local telecom clocks.
An SSU is similar to a BITS but can in turn synchronize itself to a linecard derived reference
known as a T[4] clock.
The ATCA-F140 provides dual T1/E1 interfaces to support both BITS and SSU operation.
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