Cisco ASR 903 Guide

Clocking
▀ Sync-E Configuration
▄ Cisco ASR 903 Router Design and Deployment Guide
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Quality Disabled Mode:
• Clock Availability ! clock must be available and error & alarm free
• Local Priority
Quality Enabled Mode:
• Clock Availability ! clock must be available and error & alarm free
• Quality Level ! next is to check quality level
• Local Priority ! last is to look at the priority
Sync-E Configuration
Synchronous Ethernet is an extension of Ethernet designed to provide the reliability found in traditional
SONET/SDH and T1/E1 networks to Ethernet packet networks by incorporating clock synchronization features. It
supports the Synchronization Status Message (SSM) and Ethernet Synchronization Message Channel (ESMC) for
synchronous Ethernet clock synchronization.
The following are available clocking sources on the ASR903.
From the Interfaces of IM (Max 2 per IM, up to 4 in total)
• T1/E1 Controllers of 16x T1/E1 TDM IM (SSM not supported yet)
• OC3/OC12 Controller (SSM not supported yet)
• Gig interface of 8 SFP IM
• Gig interface of 1x 10 Gig IM
• Gig interface on 8 Cu IM
From BITS and 10Mhz from RSP
• BITS interface on Active RSP(SSM supported)
• BITS interface on Standby RSP(SSM supported)
• 10 Mhz on Active RSP
Here are the commands to specify clocking sources.
Elect Interface as Clocking Candidates
network-clock input-source priority interface interface
network-clock input-source 10 interface GigabitEthernet 0/0/1
Elect 10MHz and BITS as Input Sources
network-clock input-source priority external {R0 |R1 } input source

Cisco ASR 903 Specifications

General

Brand	Cisco
Model	ASR 903
Category	Network Router
Language	English