Enhancement-type PDH (plesiochronous digital hierarchy) frame format suitable for microwave communication and mapping method

Abstract

The invention relates to an enhancement-type PDH (plesiochronous digital hierarchy) frame format suitable for microwave communication and a mapping method. The frame comprises an SG3 frame which comprises overhead of 8 bytes, stuffing of 20 bytes and data payload. In the method, synchronization and desynchronization are realized by utilizing a control bit stuffing mechanism and a CE1 frame. The enhancement-type PDH frame format has the advantages that the transmission of various PDH speeds, performance alarming and protection are supported, less overhead is occupied, the bandwidth use ratio is utilized, and valuable microwave resources are solved. Compared with the traditional SDH protocol, a great quantity of overhead bytes are decreased, thus greatly improving the bandwidth use ratio, and greatly enhancing the transmission ability of a microwave network; and the enhancement-type PDH frame format is suitable for various microwave communication equipment, and ensures that the product integrated level is improved, and the complexity levels of the system hardware and software are lowered.

Description

technical field [0001] The present invention relates to a PDH frame format and a mapping method, in particular to an enhanced PDH frame format and a mapping method suitable for microwave communication. Background technique [0002] In the digital transmission system, there are two digital transmission series, one is called "Plesiochronous Digital Hierarchy", referred to as PDH; the other is called "Synchronous Digital Hierarchy", referred to as SDH. [0003] SDH is a comprehensive information transmission network that integrates multiplexing, line transmission and switching functions and is operated by a unified network management system. It is not only applicable to optical fiber but also to a general technical system for microwave and satellite transmission. It can realize multiple functions such as effective network management, real-time service monitoring, dynamic network maintenance, and intercommunication between different manufacturers' equipment, which can greatly im...

AI Technical Summary

Problems solved by technology

However, the bandwidth of microwave links depends on factors such as frequency, debugging method, and even weather conditions, and the range of variation is large

In many cases, the bandwidth of the microwave link is smaller than the transmission capacity of STM-1

[0008] 2. Low frequency band utilization

This will inevitably cause the frequency band occupied by the PDH signal to be lower than the frequency band occupied by the SDH signal in the case of transmitting the same amount of effective information.

Images