Position:Be in to switching equipment in the light of IPTV group of requirements that sow, basis group sow duplicate / of reference point different, it is roughly OK that the form that receives a net is sowed cent is the following 3 kinds of forms.
The group that is based on BRAS sows duplicate means
User STB(machine carries a box on the head) through using PPPOE or IPOE means is received, with PPPOE is built between BRAS or IPOE passageway, the IGMP message of BRAS terminative STB, the group that is in charge of realizing user STB by BRAS is sowed duplicate, will group sow message to duplicate in the PPPOE with corresponding STB or inside IPOE passageway.
Review analyse: This implementation means suits a variety of enter receiving means, PC uses PPPOE means to be received, STB uses PPPOE or IPOE means is received, PC and STB namely OK and common a PVC/VLAN, also can do alone configuration respectively. This implementation means does not need to be done to showing a network too big transform, suit to use " compositive mode " group net circumstance, ask to the broadband plan cost tiring-room undertakes only a few alter can. But in this implementation means, BRAS faces group of user STB duplicate IPTV to sow business, facing the group of the user to broadcast duplicate spot is BRAS, begin each users from BRAS that is to say, the content that every user place nods is a separate data flows, very tall to next implicative wide requirements of BRAS, do not fit the group net of large-scale IPTV. Begin initial stage to use in IPTV business commonly.
Be based on gather together switching equipment (group sow switching equipment) group sow duplicate means
Machine of this STB(of implementation means user carries a box on the head) can use a variety of enter receiving means, PPPOE or IPOE, but use PPPOE to receive fashionable, STB must support double inn, can send the IGMP message that is based on IPOE to enclose, gather together switching equipment is terminative the IGMP message of STB, responsible will group the business of IPTV direct seeding that sows M-VLAN crosses VLAN to duplicate user.
Review analyse: This implementation means suits all enter receiving means, but when STB use PPPOE is received fashionable, STB must support double inn, can send the IGMP message that is based on IPOE to enclose. Gather together switching equipment is used to the direct seeding business between IPTV business reference point group sow M-VLAN to bear the weight of, gather together switching equipment has IGMPProxy function, the means that can use be pulled below active static state or next dynamic pulling sows IPTV group business to pass group sow M-VLAN to send touch to gather together switching equipment, press next need to cross VLAN to duplicate user.
No matter have user need group to sow,point to stream, gather together switching equipment all is sent actively all right up group sow joining message to undertake drainage; is pulled below alleged trends is to point to only should group of the first user is sowed when joining, just undertake drainage, follow-up user undertakes drainage no longer, sow when all user group when all leaving, gather together switching equipment is sent group sow leave a message to cut off group sow stream, come true thereby " by need drainage, drainage, much user applies " purpose.
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