With the continuous evolution of the development trend of fiber to replace copper, broadcast and television networks need to transform the existing copper wires step by step, and finally achieve the goal of FTTH. However, there is a large amount of copper wires left in the existing network of the broadcast and television networks, so the transformation must go through a long process from copper wires to optical fiber mixed copper wires and finally pure optical fiber. EPON+D-CMTS uses the existing copper wires to enter the home, which avoids the difficulties of rewiring. Moreover, Both EPON and CMTS technologies have unified standards, and are compatible with equipment from different manufacturers. For the network transformation of the existing CMTS of broadcast and television, EPON+D-CMTS does not need to change the service distribution mode and maintenance method, so that the services and networks can be smoothly transitioned. In terms of bandwidth and evolution, distributed CMTS is the recommended technology for future broadcast and television bidirectional network reform.
1. High bandwidth. D-CMTS can achieve a maximum of 16 channels of downlink bonding and a maximum of 4 channels of uplink bonding, providing a maximum downlink rate of 800M and an uplink rate of 160M. At the same time, the coverage is smaller (200 to 500 households coverage). Therefore, the average bandwidth of users can be greatly improved. 2. Service provisioning and maintenance modes remain the same (relative to CMTS+CM). 3. D-CMTS follows the DOCSIS 3.0 standard and is compatible with existing HFC networks, set-top boxes and CM terminals. 4. Service provisioning adopts the DOCSIS standard mode, and there is no need to change the OSS process of the existing network. D-CMTS has the aggregation management function, that is, All remote CMC devices connected to the OLT can be centrally managed on the OLT. In this way, maintenance personnel only need to manage the OLT equipment. 5. Unified standards. Compared with EOC technology, one of the biggest advantages of distributed CMTS is that the distributed CMTS can be compatible with the CMs of other manufacturers in the existing networks due to unified standards, which maximizes the protection of the investment of existing networks and makes network construction very flexible.
1. Cable modem is a network access technology based on CATV network. On the basis of the original CATV network, the CMTS equipment is placed at the local end to access the Internet, the one-way optical engine is transformed into a two-way optical engine, and a Cable modem is placed at the user end for user terminal access to achieve user broadband service. 2. Passive optical network is a type of optical fiber communication network. The PON system structure is mainly composed of the optical line terminal (OLT) of the local end, the optical distribution network (ODN) including passive optical components, and the optical network unit/optical network terminal (ONU) of the user end. PON adopts point-to-multipoint networking structure to provide multiple services for more users, including HSI, IPTV, VOIP, etc. The current mainstream PON technologies include EPON and GPON.
1. Broadcast and television operators quickly upgrade to provide high-quality broadband services. 2. Average bandwidth of users has been greatly improved. 3. The existing investment of broadcast and television is protected, and the existing service maintenance modes remain unchanged. 4. Transformation layout can be flexibly adjusted and completed in stages.