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
header.
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 or DCR configuration.
• ACR clock configuration under each controller should be performed before configuring CEM group.
How to Configure ACR and DCR
Configuring ACR for T1/E1
Configuring Adaptive Clock Recovery of T1/E1 Interfaces for SAToP
Before You Begin
Before configuring Adaptive Clock Recovery, CEM must be configured. Below are the guidelines to configure
clock recovery:
• The node (chassis) on which the DS1 is configured for ACR, must have its own clock derived from
BITS/GPS/Stratum clock.
• The minimum packet size of CEM pseudowires on the network that delivers robust clock recovery is 64
bytes.
To configure the clock on T1/E1 interfaces for SAToP in controller mode, use the following commands:
enable
configure terminal
controller t1 0/0/1
clock source recovered 1
cem-group 0 unframed
exit
To configure the clock recovery on T1/E1 interfaces in global configuration mode, use the following commands:
recovered-clock 0 0
clock recovered 1 adaptive cem 1 0
exit
48-Port T1/E1 CEM Interface Module Configuration Guide, Cisco IOS XE Fuji 16.7.x (Cisco NCS 4200 Series)
33
Clock Recovery System for SAToP
Prerequisites for Clock Recovery
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