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Multi-edge mode supports IPTV services
The multi-edge mode suitable for multi-service development can better support the network requirements of IPTV services. In multi-edge mode, high-speed Internet access is controlled by an IP edge access and BRAS; IPTV services are directed to middleware platforms through additional IP edges; VoIP services and other services are directed to softswitches or related platforms through additional IP edges; group Broadcast replication and user control are completed in DSLAM; high-speed Internet service adopts PPPoE authentication to fully protect existing network investment; IPTV / NGN service network layer authentication is completed through DHCPOpTIon82. Multiple ATMPVCs or multiple Ethernet VLANs respectively carry different services, that is, the services are logically differentiated and carried at the access layer. At present, European operators and some domestic operators have already carried IPTV services on networks that deploy this business model. Multi-edge is a network architecture based on multi-service bearing, which can smoothly upgrade and carry various services to protect the existing investment.
Service separation technology in access network
Under the multi-edge architecture, how to complete the separation of users' various business data in the access network has put forward new requirements for the access equipment DSLAM. At present, there are two schemes of multiple PVC and single PVC in the access equipment. (1) Multi-PVC scheme. In this solution, each port of the access equipment DSLAM should support multiple PVCs. Untag data service streams sent by different user terminals are respectively carried by different PVCs; PVC to VLAN mapping should be supported, and service streams of different PVCs are mapped to different service VLANs, respectively. (2) Single PVC solution. In this solution, the access equipment DSLAM should support each DSL port to use a single PVC (or PVC-free packet interface) to carry different services; DSLAM maps PPPoE and IPoE messages to different services according to the Ethernet type of the message VLAN. In contrast, the multi-PVC solution is more mature, and the current equipment support is better. Carrying different services with different PVCs has advantages in QoS guarantee, service management and service monitoring.
Multicast control technology
IP multicast technology effectively solves the problems of single-point multi-point reception and multi-point multi-point reception, and realizes efficient data transmission from point to multipoint in the IP network, which can effectively save network bandwidth and reduce network load. The basic IGMP Snooping / proxy function can solve the problem of multicast layer 2 flooding. In the IPTV service environment, cross-VLAN multicast technology, enhanced multicast control technology, preview function, and call detail list are all effective. Realize the management of user multicast services. (1) Cross-VLAN multicast technology. The standard IGMP Snooping function only provides the multicast function in the same VLAN, and most operators currently use port division 802.1qVLAN to isolate and locate users. Therefore, when implementing multicast, users are usually in different VLANs. Yes, if standard IGMP Snooping is still used at this time, it will cause a multicast stream to be established inside each VLAN, and ultimately the effect of saving network bandwidth cannot be achieved. Using cross-VLAN multicast technology can solve this problem well. (2) Multicast access control. IGMP itself does not have a method to control whether a user can join a certain multicast group, and since the multicast data stream is replicated at the access node, whether the user is allowed to obtain a certain multicast video stream at the access node Control is particularly important in terms of the security of video data, protection of the interests of operators, and prevention of illegal users. (3) User call detail list function. User call detail list is an indispensable function of IPTV service operation. DSLAM should be able to record users' on-demand behavior and related information in detail, and synchronize with the data of IPTV service platform. The user call detail list provides strong data support for business billing, viewing statistics, and user behavior analysis.
Equipment performance and QoS technology
In order to meet the user's needs for video service picture quality and fast access to information, it is usually necessary to access the network to achieve bandwidth requirements of more than 2Mbit / s per user port, non-blocking forwarding, and make millisecond-level quick responses to user join requests. Under the multi-service, multi-PVC scheme, at least four or more PVCs per port can be achieved. The access layer can support simultaneous replication of multicast streams of at least 1k. In terms of QoS service quality assurance, the access network equipment is required to have DiffSev capability, support 802.1p priority label identification and mapping, support 4 priority queues per port, and data flow supervision and shaping technology.
The access network is the first network directly facing users. Due to the large number of users, complicated access methods and high security requirements, when supporting IPTV services, in addition to the bandwidth, it needs to be greatly improved to meet the needs of video services. In addition, support for multi-edge architectures, service separation technologies, multiple enhanced multicast control technologies, and QoS-related technologies will be the key to whether IPTV services can be better carried.