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NE40E-M2 V800R010C10SPC500 Configuration Guide - WAN Access 01

This is NE40E-M2 V800R010C10SPC500 Configuration Guide - WAN Access
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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Overview of TDM

Overview of TDM

Time Division Multiplex (TDM) is implemented by dividing a channel by time, sampling voice signals, and enabling sampled voice signals to occupy a fixed interval that is called timeslot according to time sequence. In this way, multiple ways of signals, through TDM, can be combined into one way of high-rate complex digital signal (group signal) in a certain structure. Each way of signal is transmitted independently.

Based on TDM circuits on a PSN, TDM Circuits over Packet Switching Networks (TDMoPSN) is a kind of PWE3 service emulation. TDMoPSN emulates TDM services over a PSN such as an MPLS or Ethernet network; therefore, transparently transmitting TDM services over a PSN. TDMoPSN is mainly implemented by means of two protocols: Structure-Agnostic TDM over Packet (SAToP) and Structure-Aware TDM Circuit Emulation Service over Packet Switched Network (CESoPSN).

  • CESoPSN

    The Structure-aware TDM Circuit Emulation Service over Packet Switched Network (CESoPSN) function simulates PDH circuit services of low rate on E1/T1/E3 interfaces. Different from SAToP, CESoPSN provides structured simulation and transmission of TDM services. That is, with a framed structure, it can identify and transmit signaling in the TDM frame.

    Features of the structured transmission mode are as follows:

    • When services are carried on the PSN, the TDM structure needs to be protected explicitly.
    • The transmission with a sensitive structure can be applied to the PSN with poor network performance. In this manner, the transmission is more reliable.
  • SAToP

    The Structure-Agnostic TDM over Packet (SAToP) function emulates PDH circuit services of low rate.

    SAToP is used to carry E1/T1/E3 services in unframed mode (non-structured). It divides and encapsulates serial data streams of TDM services, and then transmits encapsulated packets in a PW. SAToP is the most simple method to handle transparent transmission of PDH low-rate services in TDM circuit simulation schemes.

    Features of non-structured transmission mode are as follows:

    • The mode does not need to protect the integrity of the structure; it does not need to explain or operate the channels.
    • It is suitable for the PSN of higher transmission performance.
    • It needs to neither distinguish channels nor interrupt TDM signaling.
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Updated: 2019-01-02

Document ID: EDOC1100058399

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