Prerequisites For Clock Recovery - Cisco ASR 900 Series Configuration Manual

Clock Recovery System for SAToP
The Clock Recovery System recovers the service clock using Adaptive Clock Recovery (ACR) and Differential
Clock Recovery (DCR).
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Prerequisites for Clock Recovery

• The clock of interface modules must be used as service clock.
• CEM must be configured before configuring the global clock recovery.
• RTP must be enabled for DCR in CEM, as the differential clock information is transferred in the RTP
Restrictions for Clock Recovery
• The reference clock source is used and locked to a single clock.
• The clock ID should be unique for a particular interface module for ACR/DCR configuration.
• When CEM group is configured, dynamic change in clock source is not allowed.
Prerequisites for Clock Recovery, page 133
Restrictions for Clock Recovery, page 133
Finding Feature Information, page 134
Adaptive Clock Recovery (ACR), page 134
Configuring DCR for OCn, page 142
Example: Adaptive Clock Recovery (ACR) for SAToP, page 146
Example: Differential Clock Recovery (DCR) for SAToP, page 147
Additional References for Clock Recovery, page 147
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1-Port OC-192 or 8-Port Low Rate CEM Interface Module Configuration Guide, Cisco IOS XE Everest 16.7.x (Cisco
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C H A P T E R
ASR 900 Series)
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