FTTX is a new generation of optical user access network, which is used to connect telecom operators and end users. FTTX network can be either active optical fiber network or passive optical fiber network. Because the cost of active optical fiber network is much higher, in fact, it is seldom used in user access network, so FTTX network is commonly referred to as passive optical fiber access network. The network structure of FTTX can be either point-to-point (P2P) or point-to-multipoint (P2MP). Peer-to-peer (P2P) has a high cost. It is usually used only for VIP users or users with special needs. Most FTTX networks adopt the structure of P2MP.
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