Cisco T1 User Manual

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
The clock configuration on controller must be done before configuring the clock recovery on global
configuration mode.
Note
To remove the clock configuration in ACR and DCR, you must remove the recovery clock configuration in
global configuration mode and then remove the controller configuration.
Verifying the Adaptive Clock Recovery Configuration of T1/E1 Interfaces for SAToP
Use the show recovered-clock command to verify the adaptive clock recovery of T1/E1 interfaces for SAToP:
Router# show recovered-clock
Recovered clock status for subslot 0/4
--------------------------------------
Clock Type Mode CEM Status Frequency Offset(ppb) Circuit-No
0 DS1 ADAPTIVE 0 ACQUIRED n/a 0 (Port)
48-Port T1/E1 CEM Interface Module Configuration Guide, Cisco IOS XE Fuji 16.7.x (Cisco NCS 4200 Series)
42
Clock Recovery System for CESoPSN
How to Configure ACR and DCR

Cisco T1 Specifications

General

Interface Type	T1
Data Rate	1.544 Mbps
Line Coding	AMI/B8ZS
Framing	D4/ESF
Connector Type	RJ-48
Compliance	ANSI T1.403

Summary

Configuring T1/E1 Interfaces on 48-Port T1/E1 Interface Module

Information and Restrictions for T1/E1 Interfaces

Provides an overview and lists limitations for T1/E1 interfaces.

Configuring T1/E1 Controllers and Card Type

Details steps for setting card type and configuring T1/E1 controllers.

Verifying T1/E1 Interface Configurations

Utilizes show commands to verify controller and CEM setups.

Performance Monitoring and CESoPSN Configuration

Covers performance metrics and setting up CESoPSN.

BERT Testing and Loopback Procedures for T1/E1

Explains Bit Error Rate Testing and loopback methods for troubleshooting.

Associated Commands and References for T1/E1 Modules

Lists relevant commands and provides additional documentation links.

Overview of Circuit Emulation

Pseudowire Configuration and Information

Guides on configuring and understanding pseudowires for traffic transport.

CEM Configuration and Parameters

Details on configuring CEM, classes, payload size, and dejitter buffers.

CESoPSN and DS1 Local Connect Configuration

Specifics for configuring CESoPSN and DS1 local connections.

Associated Commands and References for Pseudowire

Lists commands and additional resources for pseudowire configuration.

Alarm History

Alarm History Restrictions

Lists limitations for the alarm history feature.

Configuring Alarm History

Defines the periodicity for saving alarm entries to a file.

Verification of Alarm History Configuration

Commands to check the alarm history process and log files.

Associated Commands and References for Alarm History

Lists commands and additional resources for alarm history management.

Clock Recovery System for SAToP

Feature Information and Clock Recovery Overview

Guidance on feature support and explanation of clock recovery concepts.

Configuring ACR and DCR for SAToP

Steps for configuring Adaptive and Differential Clock Recovery for SAToP.

Verifying Clock Recovery Configurations

Commands to verify the adaptive and differential clock recovery setups.

Network Clock Configuration and References

Details on configuring network clocks and related resources.

Clock Recovery System for CESoPSN

Feature Information and Clock Recovery Overview

Guidance on feature support and explanation of clock recovery for CESoPSN.

Configuring ACR and DCR for CESoPSN

Steps for configuring Adaptive and Differential Clock Recovery for CESoPSN.

Verifying Clock Recovery Configurations

Commands to verify the adaptive and differential clock recovery setups.

Network Clock Configuration and References

Details on configuring network clocks and related resources.