1, the topology of computer network mainly includes: bus topology, star topology, ring topology, tree topology and mixed topology. Advantages of the network topology: Any two devices have their own dedicated communication channels, which does not cause network conflicts. When a device fails, the communication between other devices on the network is not affected.
2, there are six main: star structure, bus structure, tree structure, network structure, honeycomb structure, distributed structure. The star structure means that workstations are connected in a star mode to form a network. networkThere is a central node, and other nodes (workstations, servers) are directly connected to the central node, this structure is centered on the central node, so it is also called centralized network.
3, the most important topologies of computer networks are bus topology, ring topology, tree topology, star topology, mixed topology and network topology. In addition to bus, ring and star, there are tree, mixed and network topologies. Ring topology, star topology and bus topology are the three most basic topology structures. In the local area network, the most used is the star structure.
4, computer LAN network pressFiber to the building is a broadband access method based on optimized high-speed fiber local area network technology, using fiber to the building, network cable to the home to achieve user broadband access, we call FTTB LAN broadband access network (referred to as FTTB), which is one of the most reasonable, the most practical, the most cost-effective broadband access method.
3, FTTH is a cable into the household, users can use a fiber optic phone, broadband, IPTV and other services, but the installation needs to install ONU equipment. The FTTB is the cable to the corridor or to the building, and the ONU device is installed in a box somewhere in the buildingThe user installed machine accesses the user room through five types of lines; The biggest difference between them is that FTTH can provide users with higher Internet speeds. For more service offers, please pay attention to the "Anhui Telecom" public number.
4, FTTB, that is, Fiber to The Building (fiber to the building), it is the use of digital broadband technology, fiber directly to the community, and then through the twisted pair (super five types of twisted pair or 4 pairs of unshielded twisted pair) to each user. FTTH is the foreign language abbreviation of fiber Direct to the home, and the Chinese abbreviation is fiber to the home.
5, fiber broadband FTTB refers to optical fiber to the floor, that is, optical fiber to the floor through the switch and then to the user's home.
EPON (Ethernet Passive Optical Network) is a new type of optical fiber access network technology, which uses point-to-multipoint structure, passive optical fiber transmission, to provide a variety of services on the Ethernet. EPON technology uses optical fiber as the transmission channel.
Passive optical network (PON) is a type of optical distribution network (ODN) constructed only between OLT (optical line terminal) and ONU (optical network unit)A fiber optic access network that does not contain any active electronics. It is mainly divided into two types: ATM-based APON and IP-based IPPON. At the beginning, APON mainly focused on VP special line business, due to low equipment cost, small size, energy saving and system stability, with a high cost performance.
Passive optical network (PON) is a pure media network, avoiding the electromagnetic interference and lightning effects of external equipment, reducing the failure rate of lines and external equipment, improving the reliability of the system, while saving maintenance costs, is the long-term expectation of the telecommunications maintenance department technology. Passive optical accessThe advantages of the network are reflected in the following aspects: (1) Passive optical network is small in size, simple equipment, low installation and maintenance costs, and relatively small investment.
Passive optical network (PON) refers to the optical distribution network (ODN) between OLT and ONU, without any active electronics, which includes ATM-based passive optical network APON and IP-based passive optical network E/GPON.
PON (passive optical network) means that (optical distribution network) does not contain any electronic devices and electronic power supplies, ODN is all passive by optical Splitter (Splitter)Device composition, does not require expensive active electronic equipment. A passive optical network consists of an optical line terminal (OLT) installed at a central control station and a number of supporting optical network units (ONUs) installed at the user's premises.
Simply say that PON is a technology, passive refers to the network contains no power devices. It can achieve fiber to the floor FTTB, fiber to the home FTTH, the user's home computer, telephone call fiber or five types of line and ONU connected, ONU through the optical cable and optical handover box and shunt equipment and OLT connected, OLT upper end access to the telephone network or the Internet, to fullMeet the user's call and Internet requirements. PON system adopts WDM technology to realize single fiber bidirectional transmission.