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Cisco 3825 Mobile Wireless Edge Router Software Configuration Guide
OL-15667-03
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-clocks
command 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-clocks
corresponds to the following configuration (see
Figure 4-2
for 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
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.
Clocking ----------------------------------------------->
0/1/0 0/0/0 0/0/0 0/1/0
BSC---z___MWR_A---z___MWR_B---z____BTS
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