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Why Synchronize?<br />

External Reference<br />

Timing (Master Mode)<br />

Switching<br />

Node<br />

BITS<br />

Switching<br />

Node<br />

BITS<br />

Internal<br />

Clock<br />

Internal<br />

Clock<br />

SONET<br />

Timing for<br />

outgoing OC-n<br />

SONET<br />

Incoming OC-n provides<br />

timing for internal clock<br />

and outgoing OC-n<br />

26<br />

SONET<br />

ADM<br />

(Line Timed)<br />

SONET<br />

Internal<br />

Clock<br />

Customer Premises<br />

Figure 2-2 • Synchronizing a SONET Network

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