Bits/Ssu Support; Figure 4-13 Bits/Ssu Clock Flow - SMART Embedded Computing ATCA-F125 Assembly, Installation And Use

Functional Description
Functional Description
4.11.2

BITS/SSU Support

Many facilities where the Product-ShortName is likely to be deployed, such as central
offices, will include 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 Product-ShortName provides dual T1/E1 interfaces to support both BITS and SSU
operation.

Figure 4-13 BITS/SSU Clock Flow

92 ATCA-F125 (6873M Artwork) Installation and Use (6806800J94P)