Bearer technology of iptv-iptv content delivery network bearer network - China LED Curtain

Figure 1 IPTV network distributed business processes

4, IPTV bearer network transformation IPTV service based on the bearer network needs analysis, conduct of IPTV business needs to transform their existing network or create a new part of the private network. At this stage to carry out IPTV services. In particular, VOD and BTV services are generally deployed in the metropolitan area within the implementation of cross-domain access to basic unlikely situation, so the transformation of the IPTV bearer network of metro and access networks only the transformation.

4.1 Transforming MAN The optimization of the MAN should be guided by the principle that:

(1) IPTV services with traditional data services as separate physical channel can be used alone or combined with QoS mechanisms logical channel means to deliver IPTV services. To safeguard the quality requirements of video services required;

(2) upgrade MAN backbone, convergence layer node equipment and links, increasing bandwidth to meet the bandwidth requirements of IPTV services;

(3) building the core business to carry out an initial layer of CS server, centralized network, as users increase gradually in the convergence layer deployment ES, to reduce the VOD service bearer network bandwidth on demand;

(4) network control to the edge of advancing. BRAS at the edge layer and routing equipment. Linked directly to the next DSLAM and Ethernet switch;

(5) metro area multicast routing protocols to open PIM-SM, through the controllable multicast network to realize the multicast user's control and management.

For IPTV multicast replication business, there are two options that can be directly BRAS PPP user-oriented approach to the user multicast multicast replication, you can also push BTV business or L2 DSLAM Ethernet switch. DSLAM, or Ethernet switches from the user-oriented copy.

BRAS copy: Send IGMPJoin video terminal to switch to a channel message to the BRAS, BRAS based multicast access control (NMS issued) completed the multicast control, according to the user multicast authority to judge whether the user is given the template permission to access the channel, if the legitimate through the user VLAN, PVC multicast forwarding the video to the user;

DSLAM/L2 Switch replication: video terminal to send IGMPJoin packet switch to a channel to DSLAM/L2 Switch, DSLAM/L2Switch based multicast access control (NMS issued) completed the multicast control, according to the user group broadcast rights templates to check if the user is granted permission to access the channel, if the legitimate through the user VLAN, PVC multicast forwarding to the user video.

IPTV business development in the beginning, because the number of users and small businesses, can be used to copy BRAS way, do not need to transform the basic access network, when the user more time. Copy using DSLAM/L2Switch way.

4.2 access network transformation Consider the situation of domestic broadband access technology to meet the IPTV business DSL access network, consider the transformation of the main LAN access networks and access network transformation.

(1) DSL access network transformation to DSLAM as a multicast user access control and multicast replication point. To maximize the use of bandwidth and can effectively solve the multicast service can operate to manage the problem. Asked the DSLAM should support controlled multicast, and to provide adequate back-bandwidth, multicast forwarding performance and QoS support capabilities;

consider the future capacity requirements and expansion of the cost factor, will ATM-DSLAM transformation to IP-DSLAM;

ADSL2 + access in a radius of not more than 3km environment, providing 8M down, 1.3M uplink rate of support for basic home users can achieve high bandwidth requirements, and should therefore be to develop and to offer ADSL2 + higher bandwidth access technology.

(2) LAN access network transformation Operators of existing Ethernet switches, although some of the access network to support IGMPSnooping, but not for multicast access control. Hence the need for reform. Mainly to replace the end of the switch, the access switch to support all the transformation IGMPSnooping, IGMPFilter and multicast VLAN of the switch, a fundamental solution to the multicast replication and control.

Lower end of the switch through the Multicast VLAN multicast bandwidth requirements on the access layer, multicast pass down to the end of the switch requires only a copy. By the end of control, the pressure for small replication BAS, high bandwidth utilization. At this point, BAS and the following equipment to set the same VLAN for multicast forwarding multicast traffic, all the IPTV users to use the same VLAN.

End of the switch by IGMPSnooping multicast service flow in the port forwarding on demand, according to the port of the IGMP message filtering? IGMPFilter, IGMPFilter control by the end of the switch to join multicast users and multicast users not to illegally copy to achieve strong management control (directly corresponding to each physical port users).

5, concluding remarks IPTV service and network technology development is not quick, IPTV bearer network technology is inevitable, driven in the IPTV business, combined with IP network technology changes and continue to develop. Current IPTV business development is still in an exploratory stage, at this stage of business development for IPTV is based on points for the implementation units, provinces, municipalities and the form of an experimental point of IPTV business development. Business to carry out the initial, small customers, business prospects is not very clear, can not guarantee return on investment ratio, in this case, you can try is based network devices corresponding improvement, the small-scale IPTV services to meet the basic needs of .

IPTV services with large-scale development, IPTV will show the number of users may increase geometrically. IPTV in particular the broadcast business model will work with the regular flow of data services is an entirely different traffic models, some of the business focus of the node, the user may reach 1:2 or more than convergence, or even often the case 1:1. At this point, consider the metro core and aggregation layer using a separate network to carry IPTV services specialist, even in the access layer using a separate physical or logical port to carry the IPTV service, IP protection

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