Method for processing downstream broadcast and great-extension business of GPON system

Abstract

The invention provides a processing method of the downstream broadcast and the flood operation in a GPON system, comprising: arranging a GEM PORT ID or VPI / VCI for transmitting the broadcasting and the flood operation in the OLT of the GPON system; arranging a GEM PORT ID or VPI / VCI for receiving the broadcast and the flood operation in each corresponding ONT or ONU of OLT, which is the same to the GEM PORT ID or VPI / VCI. When OLT receives the broadcast and the flood pack, which are housed to be brought to the GEM frame or the ATM frame of the GEM PORT ID or VPI / VCI, the GEM frame ot the ATM frame are transmitted to each ONT or ONU on the broadcasting mode through the transmission layer of GPON, and ONT or ONU resolves the GEM frame or the ATM frame according to the self GEM PORT ID. According to the invention, through the characteristics of GPON supporting the broadcast, the processing ability of OLT is advanced, and the downstream bandwidth utilance is increased. The encrypting modeis adopted which advances the safety of the data.

Description

technical field [0001] The present invention relates to a Gigabit-capable passive optical network (Gigabit-capable passive optical network, hereinafter referred to as GPON) system, in particular to a method for processing downlink broadcast and flooding services in the GPON system. Background technique [0002] The structure of GPON consists of optical line terminal (Optical Line Terminal, hereinafter referred to as OLT), optical network terminal (Optical Network Terminal, hereinafter referred to as ONT) or optical network unit (Optical Network Unit, hereinafter referred to as ONU) and ring (or tree) topology Structured passive optical network (Passive Optical Network, referred to as PON). The OLT is generally located in the central computer room, providing a WAN interface upward, and providing an optical interface such as 1.244Gb / s or 2.488Gb / s downward to the PON. On the user side, the ONT or ONU provides users with application interfaces such as 10 / 100BaseT, T1 / E1, DS-3,...

AI Technical Summary

Problems solved by technology

In this way, for the packets in broadcasting and flooding services, since the OLT side does not know which ONT or ONU should be sent to, the OLT needs to send the packets to all ONTs or ONUs. Establish multiple data channels with the OLT for unicast transmission, and use an independent unicast for each ONT or ONU, independent GEM PORT ID or VPI / VCI to transmit, but this method has the following defects, that is, in the OLT The side needs to copy the same packet into N copies, and then broadcast it on GPON, which increases the difficulty of implementation on the OLT side, and the same content is repeatedly transmitted N times on the GPON segment, wasting bandwidth and not making good use of GPON Natural support for broadcast features

In addition, in terms of security, due to the characteristics of GPON itself, all packets are broadcast to all ONTs or ONUs, so that all ONTs or ONUs connected to the PON port can receive the packet. Excluding some malicious ONTs or ONUs, they will deliberately extract packets that are not their own, and carry out malicious forgery, which will cause hidden dangers to the business security of the PON system

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