Lossless transmission method of CES (Circuit Emulation Service)

Abstract

The invention provides a lossless transmission method of a CES (Circuit Emulation Service). The lossless transmission method mainly comprises the following steps: 1) enabling a CES packet to be simultaneously sent to main and standby paths for transmission; 2) enabling a receiving side to simultaneously receive the CES packet from the main and standby paths; 3) enabling a packet buffer of the receiving side to process the received CES packet, wherein a processing method includes an SN (Sequence Number) detection mechanism: receiving a CES packet having an expected SN from any path, putting theCES packet into the packet buffer, and then if a CES packet having a same SN is received from another path again, abandoning the CES packet received later; and 4) sending the CES packet in the packetbuffer to a user device, thereby implementing lossless transmission of the CES packet.

Description

technical field [0001] The invention relates to a lossless transmission method of a circuit emulation service (CES service). More specifically, in this method, a new CES service processing technology in the SPN (Sliced ​​Packet Network) or PTN (Packet Transport Network) network is introduced, which involves the path protection of the CES service, and the message of the CES service is lossless deal with. Background technique [0002] The circuit emulation service (CES service) is widely used in the SPN / PTN network, and is a technology for transmitting traditional circuit signals through Ethernet services. Includes the following features: [0003] 1. Convert TDM electrical signals or PCM signals into Ethernet service packets. [0004] 2. Support the transmission of CES service messages in the PSN network. [0005] 3. Support CES service protection. Usually, the main path is established in the PSN network, and the backup path protects the CES service. [0006] 4. For CES 1...

AI Technical Summary

Problems solved by technology

[0010] 1. The CES service message processing module will only receive messages on the active path. When any fault causes the switchover between the active and standby paths, the CES service message will not be received for a certain period of time.

[0011] 2. During the switching process of the active and standby paths, the switching time is required to be less than 50 milliseconds, so there will be a service damage time of less than 50 milliseconds

[0012] 3. It cannot be used to transmit services that require extremely high reliability

For example, the switch value of the control system, any loss or wrong switch indication may lead to serious consequences

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