Figure 1-1 STM-N frame structure
Regenerator
Section
Overhead
AUPTR
Multiplex
Section
Overhead
Payload
9*N
261*N
1
2
3
4
5
6
7
8
9
9*270*N(bytes)
STM-N is the frame with the dimension of 9 rows x 270 x N columns. Here, N is consistent with
that in STM-N, indicating how many STM-1 signals are multiplexed to this STM-N signal.
An STM-N frame consists of the following parts:
l Section Overhead (SOH): includes Regenerator Section Overhead (RSOH) and Multiplex
Section Overhead (MSOH).
l Administration Unit Pointer (AU-PTR): is the pointer that specifies the first byte of the
payload. The receiving end can correctly extract the payload according to the location of
the pointer.
l Payload
Overhead Bytes
SDH provides monitoring and management in layers. Monitoring is classified into section
monitoring and path monitoring. Section monitoring is classified into regenerator section
monitoring and multiplex section monitoring. Path monitoring is classified into higher-order
path monitoring and lower-order path monitoring. Different overhead bytes help to implement
the monitoring functions.
NOTE
This section describes only some SDH overhead bytes used in configuration. For details, refer to a book
about the particular topic.
l SOH
SOH consists of RSOH and MSOH.
The payload of an STM-N frame contains the path overhead (POH) that monitors low-
speed tributary signals.
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.
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