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JUNOS 10.1 Network Interfaces Configuration Guide
on interface A s received clock (external, loop timing) or the Stratum 3 clock (internal,
line timing). Interface A cannot use a clock from any other source.
By default, each interface uses the router s internal Stratum 3 clock. To configure
the clock source of each interface, include the
interface-name]
Figure 6 on page 66 illustrates the different clock sources.
Figure 6: Clock Sources
Configuring an External Synchronization Interface
The M Series 320 router supports an external synchronization interface that can be
configured to synchronize the internal Stratum 3 clock to an external source, and
then synchronize the chassis interface clock to the external source.
This feature can be configured for external primary and secondary interfaces that
use Building Integrated Timing System (BITS) or SDH Equipment Timing Source
(SETS) timing sources. When internal timing is set for SONET/SDH, Plesiochronous
Digital Hierarchy (PDH), and digital hierarchy (DS1) interfaces on the Physical Interface
Cards (PICs), the transmit clock of the interface is synchronized to BITS/SETS timing
and traceable to timing within the network.
To configure external synchronization on the M Series 320 router, include the
synchronization
66
Interface and Router Clock Sources Overview
hierarchy level:
[edit interfaces interface-name]
clocking (internal | external);
statement at the
statement at the
clocking
[edit chassis]
hierarchy level.
[edit interfaces
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