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OSN 500 550 580 V100R008C50 Commissioning and Configuration Guide 02

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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).
Basic Concepts

Basic Concepts

This topic describes the basic concepts of ATM services.

ATM Service

This section provides the definition of ATM PWE3 and describes its purpose.


The ATM PWE3 technology emulates the basic behaviors and characteristics of ATM services on a packet switched network (PSN) by using the PWE3 mechanism, so that the emulated ATM services can be transmitted on a PSN.


Aided by the ATM PWE3 technology, conventional ATM networks can be connected by a PSN. Specifically, ATM PWE3 allows transmitting conventional ATM services over a PSN by emulating the ATM services.

The networking type of ATM PWE3 can be one-to-one or N-to-one depending on the encapsulation type of ATM PWE3 packets. It is obvious that ATM PWE3 helps to transmit ATM services over the PSN, without adding ATM equipment or changing the configuration of the ATM CE equipment.

Figure 3-61  Typical application of ATM PWE3 (in the one-to-one encapsulation mode)

Figure 3-62  Typical application of ATM PWE3 (in the N-to-one encapsulation mode)


The cell encapsulation modes at both ends of a PW must be the same.

ATM Traffic

This section provides the definition of ATM traffic management and describes its purpose.


ATM traffic management is a mechanism provided by the ATM network. With the mechanism, an ATM network assures services of expected QoS objectives such as amount of bandwidth, delay, delay variation, and packet loss ratio in whatever situations, so that users can know the expected service level.

The equipment can provide ATM services with ensured quality levels by applying ATM traffic control policies.


ATM traffic management aims to prevent occurrence of congestion in ATM services and improve utilization of resources.

If ATM services are transmitted in PWE3 mode, service policies with appropriate priorities can be provided for various categories of ATM services carried by VPCs or VCCs before the ATM cells are encapsulated into PW packets. As shown in Figure 3-63, ATM traffic management generally functions in the ingress direction of a UNI on a PE.

Figure 3-63  Functioning point of ATM traffic management
Updated: 2019-01-21

Document ID: EDOC1100020976

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