Physical Pos Interface Clock Configuratio; Physical Pos Interface Clock - Zte ZXR10 ZSR V2 Configuration Manual (System Management

ZXR10 ZSR V2 Configuration Guide (System Management)
Configuration Verification
Use the show running-config ntp command on the client and the server to view
configuration. Use the show ntp status command on the client to view the IP address and
the clock of the reference clock (R2). Use the show clock command on the client. The
clock has been synchronized with the clock on the server.

10.2 Physical POS Interface Clock Configuratio

10.2.1 Physical POS Interface Clock

Clock Synchronization
The first problem to resolve in a digital network is clock synzhronization.
synchronization enables the clock frequency and phase of each network node to be
limited to a predefined error tolerance range. The sending and receiving ends can
extract/send messages at a specified time to avoid transmission performance degradation
(error codes and jitters) due to location inaccuracy in the digital transmission system.
Clock Synchronization Modes
Two clock synchronization modes are provided: pseudo synchronization and master-slave
synchronization.
l
Pseudo synchronization refers to that different digital exchanges in the digital
switching network have different clocks independent of each other. Each clock is a
Caesium atom clock having a very high accuracy and stability. Because these clocks
are highly accurate, they have different frequencies and phases, which are very
close. This is pseudo synchronization.
l Master-slave synchronization refers to that a master clock exchange is defined in
the network and has a highly accurate clock, other exchanges are all controlled
under this exchange (tracking the clock of the master exchange and taking the
master exchange clock as the reference). And these exchanges are controlled by
the upper-level exchange respectively till the end NE, the terminating exchange.
In general, pseudo synchronization is used in an international digital network, that means
this mode is used in the digital network between two countries. For example, if two
international exchanges in China and America have their own Caesium atom clocks, the
two exchanges use the pseudo synchronization mode.
Master-slave synchronization is used in digital networks in a country or region. The
master-slave synchronization clocks in the SDH network can be classified into four levels
by accuracy, corresponding to different usage ranges:
l The master clock used as the time reference of the global network
l
Slave clocks used in forwarding exchanges
l
Slave clocks used in local exchanges
l
Clocks used in the SDH (clocks built-in the SDH)
SJ-20140504150128-007|2014-05-10 (R1.0)
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