Cisco Systems 3825 manual Clock Source Command, Mwr2#sh network-clocks

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

Clock Source Command

The clock source command configures the source for synchronization of the interface transmit clock. Configure clock source line if the router is deriving its clock externally from the connected device.

Configure clock source internal if the router provides the master clock (for example, either the internal clock or the network clock).

The show network-clockscommand allows verification of the clocking configuration.

mwr2#sh network-clocks
Network Clock Configuration
---------------------------
Priority	Clock Source	Clock State	Clock Type
1	E1 0/0/0	GOOD	E1
10	Backplane	GOOD	PLL
Current Primary Clock Source
---------------------------
Priority	Clock Source	Clock State	Clock Type
1	E1 0/0/0	GOOD	E1

The previous output of show network-clockscorresponds to the following configuration (see Figure 4-2for description of how the clocking is done):

no network-clock-participate slot 1

network-clock-participate wic 0 network-clock-participate wic 1 network-clock-participate wic 2 no network-clock-participate aim 0 no network-clock-participate aim 1 network-clock-select 1 E1 0/0/0

controller E1 0/0/0

clock source line

channel-group 0 timeslots 1-31 speed 64

Figure 4-2 Clocking Example

Clocking ----------------------------------------------->

BSC---z___MWR_A---z___MWR_B---z____BTS

0/1/0 0/0/0 0/0/0 0/1/0

92854

1.The BSC provides clock synchronization to the MWR_A router.

2.The MWR_A router receives clock from the BSC via port 0/1/0 and distributes to port 0/0/0.

3.The MWR_B router receives clock from the MWR_A router via port 0/0/0 and distributes to port 0/1/0.

4.The Base Transceiver STATION (BTS) receives clock synchronization from the MWR_B router.

5.The clock synchronization from the BSC is propagated through the network to the BTS.

Cisco 3825 Mobile Wireless Edge Router Software Configuration Guide

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