Using a browser to complete Model 6511RC configuration
53
Model 6511RC User Manual
3 • Configuring the Matrix Switch for operation
ence. Slaves will not drive any clock reference. Most often the 6511RC will be defined as the
master(1),
while
most other modules in the chassis will be defined as
slave(3)
.
Module clocking source and fallback
There are two module clocking source parameters, the
primary reference
and the
fallback reference.
Unless it fails
or becomes disconnected, the
primary reference
provides the system clock for the 6511RC. Should this failure
occur, the
fallback reference
will become the clocking source for the 6511RC’s system clock.You must choose
one of the following values as the clocking source for each reference:
•
An internal oscillator
•
The STM-1 port
•
The system clock provided by the H.110 clocking master, (i.e. another module in the chassis).
The following examples illustrate how to define the system clocking parameters for two scenarios.
Example 1.
In this example, your 6511RC will be the clocking
master
for all other modules on the same
H.110 bus. Your 6511RC will derive its own timing from its STM-1 port as the main reference,
and from its
internal oscillator as the fallback reference
.
To define the system clocking parameters:
1.
Connect a STM-1 WAN line to the 6511RC’s STM-1 port.
2.
Click the
System Clocking
hyperlink on the
6511RC Configuration Menu
(see
figure 27
on page 48) to open
the
System Clocking Overview
page (see
figure 34
).
Figure 34. System Clocking Overview page, example 1
3.
For
Module Clocking Mode,
select
master(1)
from the drop-down menu.
4.
Under
Module Clocking Source
, for
Primary Reference
select
wan(602)
from the drop-down menu
.
5.
For
Fallback Reference
select
internal(200)
from the drop-down menu.
6.
Under
Module Clocking Fallback
, for
Fallback Feature Desired State, s
elect
enable(1)
.
7.
Click the
Modify
button.
