No relevant resource is found in the selected language.

This site uses cookies. By continuing to browse the site you are agreeing to our use of cookies. Read our privacy policy>Search

Reminder

To have a better experience, please upgrade your IE browser.

upgrade

OSN 500 550 580 V100R008C50 Commissioning and Configuration Guide 02

Rate and give feedback:
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

The following basic concepts help you understand and configure the relevant SDH services correctly.

Unidirectional Service

The unidirectional service indicates the service that is received and transmitted on different paths. A unidirectional service created between NE A and NE B can only be transmitted from NE A (source) to NE B (sink) or only be transmitted from NE B (sink) to NE A (source).

Bidirectional Service

The bidirectional service indicates the service that is received and transmitted on the same path. A bidirectional service created between NE A and NE B can be transmitted and received from NE A to NE B or from NE B to NE A.

MSP

The multiplex section protection (MSP) provides a function that switches the signals from the working section to the protection section.

Shared MSP Ring

As an SDH ring structure, the shared MSP protection ring provides the working and protection paths for each node in the ring network. When the service in the working path is abnormal or interrupted, the service is automatically switched to the protection path for further transmission. In this case, the service loss can be avoided.

Two-Fiber Shared MSP Ring

To form a two-fiber shared MSP ring, you need to use two fibers. In each fiber, one half of channels are used as working timeslots, and the other half of channels are used as protection timeslots. For example, in the case of an STM-4 service, VC-4s numbered 1 to 2 are used as working timeslots and VC-4s numbered 3 to 4 are used as protection timeslots. When VC-4s numbered 1 to 2 is abnormal or faulty, the service is switched to the corresponding protection timeslots 3 to 4 for further transmission.

SNCP Principle

The sub-network connection protection (SNCP) is defined by the ITU-T Recommendations. With 1+1 single-ended switching function, the SNCP is used for protecting services that travel across different subnets. The SNCP is characterized by the dual-fed and selective-receiving mode.

Principles for Generating SNCP Services

The SNCP is characterized by the dual-fed and selective receiving mode. Thus, to configure the SNCP service, you should configure the dual-fed service and the selective receiving service. On the U2000, the service can be automatically created. When the selective receiving service is configured on the U2000, the dual-fed service of the NE can be automatically created. Thus, you only need to configure the selective receiving service in actual service configuration. That is, if the SNCP service pair is configured, the service configuration of the SNCP is complete.

Translation
Download
Updated: 2019-01-21

Document ID: EDOC1100020976

Views: 50412

Downloads: 409

Average rating:
This Document Applies to these Products
Related Version
Related Documents
Share
Previous Next