Cisco Systems 3825 manual Clock-Related Commands, Network-Clock-Participate Command

Chapter 4 Configuring the Cisco 3825 Mobile Wireless Edge Router in a RAN-O Solution with the Command-Line

Clocking Requirements for Cisco 3825 Router

Figure 4-1	Clocking Example
Clocking -----------------------------------------------		>
BSC---z___MWR_A---z___MWR_B---		z____BTS

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The Base Station Controller (BSC) is responsible for providing the clock source into the network to which the connected devices must synchronize its transmit clocks.

The BSC provides the clock source to the Cisco 3825 router, which is distributed to the participating serial/ATM ports.

Clock-Related Commands

The following sections describe the uses of the clock-related commands:

•Network-Clock-Participate Command

•Network-Clock-Select Command

•Clock Source Command

Network-Clock-Participate Command

The network-clock-participatecommand allows the ports on a specified network module or voice/WAN interface card (VWIC) or high-speed WAN interface card to use the network clock for timing. For example:

mwr2(config)#network-clock-participate ?

aim	AIM	Module
slot	Network Module Slot
wic	WIC	Module

Use “aim” keyword to identify Advanced Integration Module

Use “wic” keyword to specify the voice/WAN interface card

Network-Clock-Select Command

The network-clock-selectcommand names a source to provide timing for the network clock and to specify the selection priority for this clock source.

To ensure that the router uses the correct interface as the primary (highest priority) clock source, this command must be present to configure the clocking priority for the system. To establish the clocking hierarchy (in case the primary source goes down), the same command needs to be repeated with a different priority for each interface:

network-clock-select 1 e1 0/0/0

network-clock-select 2 e1 0/0/1

Cisco 3825 Mobile Wireless Edge Router Software Configuration Guide

OL-15667-03 4-3