The type of fiber optic access equipment mainly depends on its application scenarios and requirements. The following are some common fiber optic access devices:
ONT (Optical Network Terminal): ONT is a user-side device under FTTH (Fiber To The Home) and FTTO (Fiber To The Office) application types and is used by a single user. ONT is usually shared by multiple terminals in the home, but can only be counted as one user.
ONU (Optical Network Unit): ONU is a user-side device under the FTTB (Fiber To The Building) application type and is shared by multiple users.
SFU (Single Family Unit): SFU is an ONT that generally has 1 to 4 Ethernet interfaces, 1 to 2 fixed phone interfaces, and some models also have cable TV interfaces. SFU does not have a home gateway function, and requires a terminal connected through the Ethernet port to dial-up Internet access, and the remote management function is weak.
HGU (Home Gateway Unit): HGU is also a kind of ONT. The optical modems equipped by FTTH users opened in recent years are all HGU. Compared with SFU, HGU has the following advantages: HGU is a gateway device, which is convenient for internal home networking; HGU supports routing mode and has NAT function, and is a three-layer device; HGU can implement its own broadband dial-up application, and connect computers and mobile terminals You can go online directly without dialing.
SBU (Single Business Unit): SBU is mainly used for access of FTTO users. It generally has an Ethernet interface. Some models have an E1 interface, a fixed phone interface, or have wifi function.
MDU (Multi-Dwelling Unit): MDU is mainly used for access of multiple residential users under FTTB application type. It generally has at least 4 user-side interfaces, usually with 8-way, 16-way, 24-way FE or FE+POTS (landline telephone) interface.
MTU (Multi-Tenant Unit): MTU is mainly used for access by multiple enterprise users or multiple terminals in the same enterprise in FTTB scenarios. In addition to having an Ethernet interface and a fixed phone interface, MTU may also have an E1 interface.
OLT (Optical Line Terminal): As the core equipment of the optical fiber communication system, OLT plays an important role in data aggregation, management and control. In the entire optical fiber network, the OLT is located in the central office and is responsible for communicating with the ONT at the user end and coordinating and controlling the transmission of data.
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