CHAPTER 5
Clock Recovery System for CESoPSN
The Clock Recovery System recovers the service clock using Adaptive Clock Recovery (ACR) and Differential
Clock Recovery (DCR).
• Finding Feature Information, on page 39
• Information About Clock Recovery, on page 39
• Prerequisites for Clock Recovery, on page 41
• Restrictions for Clock Recovery, on page 41
• How to Configure ACR and DCR, on page 42
• Associated Commands, on page 45
• Additional References for Clock Recovery, on page 46
Finding Feature Information
Your software release may not support all the features documented in this module. For the latest caveats and
feature information, see Bug Search Tool and the release notes for your platform and software release. To
find information about the features documented in this module, and to see a list of the releases in which each
feature is supported, see the feature information table.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support.
To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.
Information About Clock Recovery
Clock Recovery System in CESoPSN
The Clock Recovery System is able to recover the service clock using two methods, the Adaptive Clock
Recovery and Differential Clock Recovery.
Adaptive Clock Recovery in CESoPSN
When emulating TDM over PSNs, the physical layer clock is sometimes not available to both ends. Adaptive
Clock Recovery (ACR) is a technique where the clock from the TDM domain is mapped through the packet
domain. The sending Inter Working Function (IWF) processes outgoing packets with an internal free-running
48-Port T1/E1 CEM Interface Module Configuration Guide, Cisco IOS XE Fuji 16.7.x (Cisco NCS 4200 Series)
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