SONET SDH Transmission Rate
(Mbit/s)
Electrical
Signal
Optical Signal Optical Signal
STS-36 OC-36 STM-12 1866.240
STS-48 OC-48 STM-16 2488.320 (2.5 Gbit/s)
STS-96 OC-96 STM-32 4876.640
STS-192 OC-192 STM-64 9953.280 (10 Gbit/s)
Channelization and Unchannelization
When SDH signals are formed by multiplexing low-speed tributary signals, these signals are
called channels.
Channelization indicates that multiple independent channels of data are transmitted over an
optical fiber by using low-speed tributary STM-N signals. During the transmission, each channel
has its own bandwidth and start and end points, and follows its own monitoring policy.
Unchannelization indicates that all data is transmitted in a single channel over an optical fiber
by using all STM-N signals. During the transmission, all the data has the same ID and start and
end points, and follows the same monitoring policy.
Channelization can utilize bandwidth in transmitting multiple channels of low-speed signals.
Unchannelization is adopted to transmit a single channel of high-speed signals.
POS
The Packet over SONET/SDH (POS) technology is applied to MAN and WAN, supporting
packet data such as IP packets.
Frame Structure of SDH
To facilitate understanding, the following section describes the frame structure of the SDH
signal, that is, the structure of the STM-N frame.
To add or drop low-speed tributary signals to or from high-speed signals, try to distribute
tributary signals in the frame equably and regularly. The ITU-T regulates that STM-N frames
are rectangular and expressed in bytes, as shown in Figure 1-1.
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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