CHAPTER 4
Clock Recovery System for SAToP
The Clock Recovery System recovers the service clock using Adaptive Clock Recovery (ACR) and Differential
Clock Recovery (DCR).
• Finding Feature Information, on page 31
• Information About Clock Recovery, on page 31
• Prerequisites for Clock Recovery, on page 33
• Restrictions for Clock Recovery, on page 33
• How to Configure ACR and DCR, on page 33
• Associated Commands, on page 36
• Additional References for Clock Recovery, on page 37
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
Adaptive Clock Recovery (ACR)
Adaptive Clock Recovery (ACR) is an averaging process that negates the effect of random packet delay
variation and captures the average rate of transmission of the original bit stream. ACR recovers the original
clock for a synchronous data stream from the actual payload of the data stream. In other words, a synchronous
clock is derived from an asynchronous packet stream. ACR is a technique where the clock from the TDM
domain is mapped through the packet domain, but is most commonly used for Circuit Emulation (CEM).
Effective Cisco IOS XE Everest 16.5.1, ACR is supported on the 8-port T1/E1 interface module.
48-Port T1/E1 CEM Interface Module Configuration Guide, Cisco IOS XE Fuji 16.7.x (Cisco NCS 4200 Series)
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