System information

Chapter 3 Initially Configuring the ATM Switch Router
Configuring Network Clocking
3-10
ATM Switch Router Software Configuration Guide
78-6277-03, Cisco IOS Release 12.0(13)W5(19)
Configuring Network Clocking
This section describes network clocking configuration of the ATM switch router. Properly
synchronized network clocking is important in the transmission of constant bit rate (CBR) and variable
bit rate real time (VBR-RT) data. For an overview of network clocking and network clock configuration
issues, refer to the chapter “Network Clock Synchronization” in the Guide to ATM Technology.
This section includes the following:
• Configuring Network Clock Sources and Priorities (Catalyst 8540 MSR) on page 3-11
• Configuring Network Clock Sources and Priorities (Catalyst 8510 MSR and LightStream 1010) on
page 3-12
• Displaying the Network Clocking Configuration on page 3-13
• Configuring Network Clocking with NCDP on page 3-14
• Network Clock Services for CES Operations and CBR Traffic on page 3-17
Network Clocking Features
Different types of network clock sources are available on the ATM switch router, both internal and
external. Table 3-1 provides a summary of network clocking features.
Table 3-1 Network Clocking Feature Summary
Platform
Up/Down
Detection
Loss of
Synchronization
Detection
Phase
Adjustment
Cutover
Stratum 3
Clock BITS
1
Port
1. BITS = Building Integrated Timing Supply
Clock Source
Preference
Catalyst 8540MSR
with network clock
module
Yes Yes Yes Yes Yes Best
Catalyst 8510 MSR Yes Yes Yes No No Medium
LightStream 1010
with FC-PFQ
Yes Yes Yes No No Medium
Catalyst 8540 MSR
without network
clock module
Yes No No No No Poor
LightStream 1010
with FC-PCQ
Yes No No No No Poor