Apparatus, system and method for extracting E1 access time division multiplex data

Abstract

An extraction process of E1 switch-in time division multi-plexing data comprises the following steps that first producing the interrupt after the last channel of a multi-channel controller MCC having been received the data, processing the bit data with N number (N is the positive integer which is integer multiple relationship with 4) which receives the all channels of the MCC through the interrupt, and dividing the N bit data into n groups using 4 bits as a unit, secondly conducting the 2-bit transposition processing for the four users data in a same bit by each group data through the 32-bit logic calculus in order to array in turn the 8-bit of a same user in the 4 bits into a same bit, thirdly repeating the third step until the 2-bot transposition processing of the n groups is finished, conducting data evaluation operation to obtain the data abstraction results using 32-bit as a unit after conducted the data evaluation regulation for the 4 bit data using 16 bit as a unit. The invention fully utilizes the resource of a CPU and significantly increases the extraction rate of the data.

Description

technical field [0001] The invention relates to a time-division multiplexing (TDM, Time-Division Multiplexing) data transmission technology in the field of telecommunication, in particular to a technology for extracting data from a TDM service data stream accessed by an E1. Background technique [0002] E1 resources are very abundant in the existing telecommunication network, and many original devices use E1 interfaces. If other access methods, such as IP access, can be provided without changing the original E1 interface devices, the network can be maximized. It is the best solution for operators and equipment manufacturers to make use of existing resources, extend the service life of existing equipment, and realize the smooth transition from E1 access to other access methods. [0003] A 2.048Mbit / s E1 link uses the pulse code modulation (PCM, Pulse Code Modulation) format and is divided into 32 time slots, and the data transmission rate of each time slot is 64kbit / s; that i...

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