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PON-based (passive optical network-based) RS485/RS232 data frame and Ethernet data frame uplink method

A technology of RS485 and Ethernet, which is applied in the field of office system (OLT) and can solve problems such as modification

Inactive Publication Date: 2012-01-18
杭州开鼎科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In this way, there is a problem: when the dedicated control network needs to grow and develop, it is restricted by its original data format and protocol. If you want to change to use a general-purpose Ethernet, you must modify its original data format and protocol.

Method used

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  • PON-based (passive optical network-based) RS485/RS232 data frame and Ethernet data frame uplink method
  • PON-based (passive optical network-based) RS485/RS232 data frame and Ethernet data frame uplink method
  • PON-based (passive optical network-based) RS485/RS232 data frame and Ethernet data frame uplink method

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Embodiment

[0033] Embodiment: in utilizing the present invention to carry out chip design and development process, first need formulate special conversion agreement, namely how to encapsulate original network RS485 / RS232 data into Ethernet frame, then how to convert back to RS485 / RS232 data.

[0034] When this design is working, the link connection between the protocol conversion terminal and the master station is carried out first, and then the data is transmitted.

[0035] When the data reaches the protocol conversion terminal or master station, the terminal or master station first judges whether the currently received Ethernet frame belongs to the original RS485 / RS232 data encapsulation, if not, it will be discarded, and if so, it will be converted according to the established conversion protocol , and then sent to the original terminal or master station.

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Abstract

A PON-based (passive optical network-based) RS485 / RS232 data frame and Ethernet data frame uplink method includes the following steps: (a) establishing a protocol conversion system on an OLT (optical line terminal), which is used for communicating with a master station in an existing private network and packaging original data into an Ethernet frame; (b) establishing a protocol conversion terminal at the ONU (optical network unit) side, which is used for establishing connection with a master protocol conversion station and carrying out conversion between the Ethernet frame and the original data. The method can transfer the private network using the RS485 / RS232 protocol to an Ethernet network without changing the original protocol, and consequently, after an EPON (Ethernet passive optical network) system is used, existing devices still can continue to be used.

Description

technical field [0001] The invention relates to the technical field of packing RS485 / RS232 data into Ethernet frames in an EPON terminal system (ONU), and forwarding them to the central office system (OLT) together with other Ethernet frames. Background technique [0002] EPON system is a point-to-multipoint network system, which mainly includes three parts: central office OLT, terminal ONU and passive optical splitter. In the downstream direction, the Ethernet data packets sent by the OLT are transmitted to each ONU through a 1xN passive optical splitter in a broadcast manner, and the ONUs selectively extract the data packets; Due to the directional characteristics of the splitter, the data packets sent by any ONU can only reach the OLT, but not the ONU, that is, the data of all ONUs are transmitted to the same OLT, thus constructing the point-to-multipoint network of the EPON system. [0003] In the EPON system, all data are encapsulated into Ethernet frame format, and al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04Q11/00H04L12/28
Inventor 张宇
Owner 杭州开鼎科技有限公司