Method for transmitting upgrade software to optical network unit in Ethernet passive optical network

Abstract

The invention discloses a method to send upgrade software and set LLID to ONU of EPON, which comprises: A. the OLT divides the upgrade software into some parts and set then into down message labeled by LLID to broadcast to governmental ONU; B. the ONU decides the self LLID whether same to the LLID in message or whether the LLID is broadcast LLID, if yes, the ONU is objective ONU and receives by turns the broadcast down message; or else, the ONU is not objective ONU. This invention has rapid upgrade speed and supports batch upgrade.

Description

technical field [0001] The invention relates to an upgrade technology for an optical network unit (ONU) in an Ethernet passive optical network (EPON), in particular to a method for sending upgrade software to the ONU in the EPON. Background technique [0002] EPON is a single-fiber bidirectional optical access network with a point-to-multipoint structure. It consists of an optical line terminal (OLT) at the EPON central office, an ONU at the EPON user end, and an optical dispersive network (ODN). It has large bandwidth, long transmission distance, It has the advantages of no electromagnetic interference, high security, saving backbone optical fibers, and flexible networking. [0003] The schematic diagram of the EPON network is shown in Figure 1: the EPON consists of an OLT, a passive optical splitter (POS) in the ODN, and multiple ONUs. Among them, the OLT is placed in the central computer room of the EPON central office, and multiple ONUs are respectively placed in the co...

AI Technical Summary

Problems solved by technology

In theory, it takes more than two minutes to transmit an upgrade software with a size of 128K bytes through OAM packets. In actual transmission, the time consumed will be longer (three to five minutes).

[0008] Second, it does not support batch upgrades. Since the 802.3ah standard stipulates that OAM messages do not support broadcasting, but can only be sent in a point-to-point manner, when the OLT upgrades multiple ONUs at the same time, it can only upgrade ONUs one by one. Use point-to-point mode to upgrade software through OAM message transmission, which greatly increases the time to upgrade ONU and makes the process of upgrading ONU very cumbersome

[0009] In addition, in the third stage, if the ONU cannot be restarted by burning the upgrade software written into FLASH, the ONU upgrade fails.

Since the current ONU upgrade process does not support upgrade failure rollback, after the ONU cannot be restarted by burning the upgrade software written into the FLASH, the ONU cannot be started, and it can only be returned to the equipment supplier to re-burn the ONU software into the ONU FLASH, such a situation is unacceptable for ONU users, EPON operators and ONU equipment providers

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