CN110518978B

CN110518978B - Hybrid data transmission assembly based on optical fiber link

Info

Publication number: CN110518978B
Application number: CN201910666267.7A
Authority: CN
Inventors: 袁泉; 孔韵雯; 陈栋; 赵晨旭; 于庆伟
Original assignee: China Aeronautical Radio Electronics Research Institute
Current assignee: China Aeronautical Radio Electronics Research Institute
Priority date: 2019-07-23
Filing date: 2019-07-23
Publication date: 2022-12-27
Anticipated expiration: 2039-07-23
Also published as: CN110518978A

Abstract

The invention discloses a hybrid data transmission component based on an optical fiber link, which comprises a video/common sending module and a frame priority control/arbitration module, wherein the video/common sending module is used for splitting video or irregular data to be sent to form an FC data frame which is placed in a corresponding virtual queue; the frame priority control/arbitration module is used for defining the priority level of each virtual queue according to different requirements, reading FC data frames from the corresponding virtual queues according to the priority levels and inputting the FC data frames into a subsequent module. The invention introduces a composite transmission protocol, so that more types of data can be transmitted on a single optical fiber link, and the effective utilization of bandwidth is promoted.

Description

Hybrid data transmission assembly based on optical fiber link

Technical Field

The invention relates to a system for transmitting large-flow irregular data (hereinafter referred to as original data) and video image data on an optical fiber link, wherein a transmission protocol is modified moderately according to the specification of an optical fiber channel communication protocol (FC-FS-2). The new sending protocol not only makes up the defect that the traditional ARINC818 protocol can not send original data, but also makes up the defect that FC-AE can not effectively send video images.

Background

Under the continuous development of avionics technology, an avionics message protocol (FC-AE) and a fibre channel audio-video transmission protocol (FC-AV) based on Fibre Channel (FC) technology have been applied and developed.

In an avionic network, the types of data transmitted are complex and various, and the system is classified into optical fiber link transmission, and most commonly used are various video image data, large-flow irregular data and small-quantity short-time indefinite data. The data is typically transmitted using either the FC-AE protocol or the ARINC818 protocol (hereinafter 818 protocol). Both protocols are modified on the basis of FC-FS-2, and the FC-AE protocol is a protocol capable of sending bidirectional data and has strict flow control mechanisms (such as end-to-end and credit-to-credit flow control mechanisms). The 818 protocol is mostly unidirectional transmission (may have a simple switching matrix) for point-to-point transmission, and has no strict flow control mechanism. Both protocols have their own excellence, so in the avionics system, it often happens that some modular product has defined several 818 links, but still needs to transmit data which cannot be transmitted by other 818 protocols, so that optical fiber links have to be added for data transmission, and vice versa. Therefore, if the two protocols can be compatible, and the physical link of the transmission fiber can be deleted, it will be significant to reduce the complexity of the system and the total power consumption.

Disclosure of Invention

The invention aims to provide a hybrid data transmission assembly based on an optical fiber link, and the system follows an optical fiber channel communication protocol (FC-FS-2), and combines a plurality of protocol subsets of the optical fiber channel communication protocol, thereby improving the bandwidth of data transmission and reducing the complexity and power consumption of the system.

The invention aims to be realized by the following technical scheme:

a hybrid data transmission assembly based on an optical fiber link comprises a video/common sending module and a frame priority control/arbitration module, wherein the video/common sending module is used for splitting video or irregular data to be sent to form an FC data frame and placing the FC data frame in a corresponding virtual queue;

the frame priority control/arbitration module is used for defining the priority level of each virtual queue according to different requirements, reading FC data frames from the corresponding virtual queues according to the priority levels and inputting the FC data frames into a subsequent module.

The hybrid data transmission component based on the optical fiber link also comprises a data integrity detection/redundancy module, which is used for filling relevant redundancy codes in the FC data frame output by the frame priority control/arbitration module, then carrying out integrity check and finally sending the FC data frame to two paths of optical fiber links.

The hybrid data transmission component based on the optical fiber link further comprises a video/common receiving module, the data integrity detection/redundancy module is further used for checking the integrity of frames of FC data frames received from the optical fiber link, then aiming at a design algorithm of redundant frames, a path of input frame priority control/arbitration module in two paths of data is selected, the frame priority control/arbitration module extracts the priority of the FC data frames input by the data integrity detection/redundancy module, the FC data frames are transmitted into corresponding virtual queues according to the priority, and the video/common receiving module reads FC data from the virtual queues and restores the FC data into standard video data or irregular data to be transmitted.

The invention has the beneficial effects that:

the invention can transmit various composite data by using limited optical fiber resources and support configurable operation aiming at different application scenes, thereby quickly reducing system resources and power consumption, improving the reusability of modules and reducing the development cost and the research and development period of the system.

By switching the functional modules, the optimization of the bottom layer data function under different application scenes in the application process is achieved, and the requirements on bandwidth, delay and signal integrity under different scenes are met. The structure of easy expansion makes most of function modules multiplex, and can be made into a structure supporting more data source ends (a plurality of video sources and a plurality of irregular data sources) only by carrying out little adaptation modification, thereby further meeting the requirements of users.

The scheme can be applied to a plurality of development platforms, has strong applicability and has obvious economic benefit and application prospect.

Drawings

Fig. 1 is a schematic diagram of a hybrid data transmission assembly based on fiber optic links.

Fig. 2 is a schematic diagram of mixed data transmission according to priority.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

As shown in fig. 1, the hybrid data transmission component based on the optical fiber link according to the embodiment includes a video/normal sending module, a frame priority control/arbitration module, a data integrity detection/redundancy module, and a video/normal receiving module.

In the data transmission process:

the video/common sending module splits the video or the irregular data to be sent to form FC data frames, and the FC data frames are placed in the corresponding virtual queues.

The portion of the video data for real-time display by the external device is highly time-critical with low latency, and such video data is typically discrete data. In addition, the video data used for storage in the video data has low time requirement, and the data is often continuous. In the original data frame, there are data requiring fast response, and the data generally has a small amount of data. There will also be a time-critical but large amount of transmission of the original data. Therefore, based on this need, the following two situations arise:

1 video data of high priority and video data of low priority, raw data.

2 high priority raw data and low priority video data, raw data.

As shown in fig. 2, in the scenario of case one, video data needs to be accurately transmitted, and it is ensured that the image display of the external device is not interrupted, it is required to set the highest priority a for transmitting the image in this path, and ensure the lowest delay. In the transmission interval, the original data B or the video data C having a low priority is transmitted. Under the condition of ensuring the optimal video data transmission, the priority of other original data or videos can be randomly arranged and transmitted in sequence. And designing a three-level priority and three-way virtual queues according to requirements, wherein the external interface is two video interfaces, and one AXIS interface.

The design concept of the second case is similar to that of the first case, some original data need to be transmitted at the highest speed, the priority is A, the length is unknown, and the sequence number of the last frame is An. However, the priority of the other video data and the original data need not be high, the priority of the video data B, C and the priority of the original data D. Four levels of priority and four paths of virtual channels need to be designed, and the external interface is two paths of video interfaces and two paths of AXIS interfaces.

Preferably, there is only one highest priority data in a single hybrid data transport module, so that if a system application requires more than two high priority videos or high priority raw data, a single module will not meet the system requirements due to inestimable delay. We can clone this hybrid data transport component, eventually allowing the system requirements to be met. The premise for realizing the functions is that the sum of all data transmission and the bandwidth of delay loss does not exceed the linear speed of the current optical fiber link transmission.

The data integrity detection/redundancy module is used for filling related redundancy codes in the FC data frames output by the frame priority control/arbitration module, and then the FC data frames are subjected to integrity check and finally sent to two paths of optical fiber links.

In the data receiving process:

the data integrity detection/redundancy module checks the integrity of frames of FC data frames received from an optical fiber link, then selects one path of input frame priority control/arbitration module in two paths of data according to a design algorithm of redundancy frames, the frame priority control/arbitration module extracts priority from the FC data frames input by the data integrity detection/redundancy module, the FC data frames are transmitted into corresponding virtual queues according to the priority, and the video/common receiving module reads FC data from the virtual queues and restores the FC data into standard video data or irregular data to be transmitted.

Depending on the system requirements and the data priority, or the data reliability standard, the use of external configuration may enable or disable the related functions in the frame priority control/arbitration module and the data integrity check/redundancy module, thus completing the last block of the tile, i.e. the hybrid data scheduling mechanism.

It should be understood that equivalents and modifications of the technical solution and inventive concept thereof may occur to those skilled in the art, and all such modifications and alterations should fall within the scope of the appended claims.

Claims

1. A hybrid data transmission component based on an optical fiber link comprises a video/common sending module, a frame priority control/arbitration module, a data integrity detection/redundancy module and a video/common receiving module, and is characterized in that: the video/common sending module is used for splitting video or irregular data to be sent to form an FC data frame and placing the FC data frame in a corresponding virtual queue;

the frame priority control/arbitration module is used for defining the priority level of each virtual queue according to different requirements, reading FC data frames from the corresponding virtual queues according to the priority levels and inputting the FC data frames into a subsequent module;

the data integrity detection/redundancy module is used for filling related redundancy codes into the FC data frame output by the frame priority control/arbitration module, and then sending the FC data frame to two paths of optical fiber links after integrity check; the data integrity detection/redundancy module is also used for verifying the integrity of frames of FC data frames received from the optical fiber link, then selecting one path of input frame priority control/arbitration module in two paths of data according to a design algorithm of redundant frames, the frame priority control/arbitration module extracts priority from the FC data frames input by the data integrity detection/redundancy module, and transmitting the FC data frames into corresponding virtual queues according to the priority;

and the video/common receiving module reads FC data from the virtual queue, restores the FC data into standard video data or irregular data and transmits the standard video data or the irregular data.