l Slave clock mode: uses line clock signal.
Similar to a synchronous serial interface working in DTE and DCE modes, a POS also works
in different clock modes.
l When the POS interfaces of two switches are connected directly or through the Wavelength
Division Multiplexing (WDM) device, configure one interface to work in master clock
mode and the other interface in slave clock mode to avoid link flapping.
l When the POS interface of a switch, which functions as a DTE, is connected to a switching
device that functions as a DCE and uses internal clock signals, configure the POS interface
to work in slave clock mode.
Procedure
Step 1 Run:
system-view
The system view is displayed.
Step 2 Run:
interface pos interface-number
The POS interface view is displayed.
Step 3 Run:
clock { master | slave }
Clock mode of the POS interface is configured.
By default, a POS interface works in master clock mode.
----End
1.3.4 Configuring Overhead Bytes
SONET/SDH provides a variety of overhead bytes to implement monitoring at different levels.
Context
C2, the path signal label byte, is contained in the higher-order path overhead. C2 is used to
specify the multiplexing structure and the attributes of the information payload in a VC frame.
J0, the regeneration section trace byte, is contained in the section overhead. It is used to detect
the continuity of the connection between two ports on the section layer.
J1, the higher-order VC-N path trace byte, is used to detect the connectivity of the connection
between two ports on the path layer.
C2, J0, and J1 of the receiver and the transmitter must be the same; otherwise, the two ends
cannot communicate.
Procedure
Step 1 Run:
system-view
The system view is displayed.
Quidway S9300 Terabit Routing Switch
Configuration Guide - WAN Access 1 POS Interface Configuration
Issue 02 (2011-07-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
7
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