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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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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).


    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.
Updated: 2019-01-02

Document ID: EDOC1100058399

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