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NE40E V800R010C00 Feature Description - WAN Access 01

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Introduction of TDM

Introduction 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 just a mature solution of this kind. TDMoPSN is applied to implement accessing and bearing of TDM services on the PSN. TDMoPSN is mainly applied to IP RAN carrying wireless services to carry fixed network services between MSAN devices.


The TDMoPSN feature offers the following benefits to carriers:

  • Saves rent for expensive TDM leased lines.

  • Facilitates smooth evolution of the network.

  • Simplifies network operations and reduces maintenance cost.

  • Binds only the useful time slots into packets to improve the resource utilization.

The TDMoPSN feature offers the following benefits to users:

Be free from paying expensive rent for leased lines for fixed network operators when an enterprise access the network for the voice service.

Updated: 2018-07-04

Document ID: EDOC1100027168

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