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Implementing method of parallel frame locator for optical synchronous digital transmission system

A technology of optical synchronous digital transmission system, which is applied in the field of frame positioning, can solve the problems of difficulty in circuit implementation and high production and processing costs, and achieve the effects of simple circuit implementation, reduced power consumption, and cost savings

Inactive Publication Date: 2005-01-26
HUAWEI TECH CO LTD
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Problems solved by technology

[0006] The serial implementation method of the above-mentioned frame locator requires the circuit to work at a very high frequency (such as for STM-16, the line rate is 2488.320Mbit / s, then the circuit operating frequency is 2488.320MHz), thus causing difficulties in circuit implementation and production and processing. high cost

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  • Implementing method of parallel frame locator for optical synchronous digital transmission system
  • Implementing method of parallel frame locator for optical synchronous digital transmission system
  • Implementing method of parallel frame locator for optical synchronous digital transmission system

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Embodiment approach

[0036] For the convenience of description below, assume that K is 1, and the frame alignment mode is 2A12A2 (0xF6F62828), that is, if two A1 bytes are found and then two A2 bytes are found, it is considered that the frame header has been searched. The functional block diagram of the parallel frame locator is shown in image 3 shown.

[0037] Latch the 8-bit parallel input data of 6 parallel clock beats to reg0[7:0]~reg5[7:0], and perform 8 parallel 32-bit comparisons at the same time, respectively:

[0038] Comparator 1: reg1[7:0]+reg2[7:0]+reg3[7:0]+reg4[7:0] and frame alignment mode

[0039] Comparator 2: reg0[7]+reg1[6:0]+reg2[7:0]+reg3[7:0]+reg4[7:0] and frame alignment mode

[0040] Comparator 3: reg0[7:6]+reg1[5:0]+reg2[7:0]+reg3[7:0]+reg4[7:0] and frame alignment mode

[0041] Comparator 4: reg0[7:5]+regl[4:0]+reg2[7:0]+reg3[7:0]+reg4[7:0] and frame alignment mode

[0042] Comparator 5: reg0[7:4]+reg1[3:0]+reg2[7:0]+reg3[7:0]+reg4[7:0] and frame alignment mode

[0...

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Abstract

The invention relates to a frame locating technique in optical synchronous digital transmission system; during STM-N frame data process of the optical synchronous digital transmission system, making frame locating operation at parallel system clock, and its characters: it can reduce working frequency of frame locator and provide system stability; and can select proper parallel digit according to actual requirement to apply to frame locating operation in the different-line speed frame data process.

Description

Technical field: [0001] The invention relates to the frame alignment technology in the optical synchronous digital transmission system (abbreviated as SDH / SONET). Background technique: [0002] There are two different types of overhead arranged in the SDH frame structure, namely the section overhead SOH and the path overhead POH, which are used for the maintenance of the section layer and the path layer respectively. The section overhead SOH contains framing information, information for maintenance and performance monitoring, and other operational functions. [0003] The frame alignment bytes A1 and A2 in the SOH are used to identify the starting position of the frame. A1 and A2 have definite binary values, that is, A1 is 11110110, and A2 is 00101000. In the STM-1 frame, 6 frame alignment bytes are centrally arranged, accounting for about 0.25% of the frame length. The selection of this frame alignment length is the result of comprehensive consideration of various factors...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/02H04J3/06H04J3/16H04Q3/52
Inventor 刘彷平
Owner HUAWEI TECH CO LTD
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