What is Passive Optical Local Area Network (POLAN)
Definition of passive optical local area network
PON (Passive Optical Network). PON (Passive Optical Network) means that (an optical distribution network) does not contain any electronic devices or electronic power supply. All ODNs consist of passive components such as partitions, and do not require expensive active electronic devices.
- A PON system mainly consists of a terminal line (OLT: Optical Line Terminal) for the central office, an Optical Distribution Network (ODN: Optical Distribution Network) including passive optical components, and an Optical Network Unit/Optical Network Terminal (ONU/ONT Optical) at the user end. Network Optical Network Unit/Terminal, the difference is that the ONT is directly at the user end, and there are other networks between the ONU and the user, such as Ethernet) and Network Element Management System (EMS), which is typically point-to-multiplex. Tree topology.
- The outstanding advantage of the PON network is the elimination of outdoor active devices, and all signal processing functions are done in the switch and in the user's home equipment. Moreover, the initial investment in this access method is small, and most of the money is postponed until the user actually arrives. Its transmission distance is shorter than that of an active fiber access system, the coverage range is small, but its cost is low, there is no need to set up a separate machine room, and the maintenance is easy. Therefore, this structure can serve home users economically.
- POLAN is an abbreviation for Passive Optical Local Area Network
- PON is short for Passive Optical Network
- LAN is an abbreviation for Local Area Network
- WAN is an abbreviation for Wide Area Network
- MAN is an abbreviation for MANArea Network
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Basics of Polan Network
In fiber optics are used to transmit data and information, and to retrieve the data at the correct destination, a way to separate it is required. These elements manage the distribution of the signal to pre-selected clients, and these switching elements work in different ways to put the incoming and outgoing signals in a suitable place.
A passive optical network does not include any electrically powered switching elements, instead, it uses optical splitters to separate and combine the optical signals, since these elements do not require power, hence the name "passive", these networks require power only at the source. The end of the signal receives this progress is one of the advantages of information and communication technology.
Features of the PON system
- It is relatively low in material cost, simple to maintain, easy to expand, and easy to upgrade. The PON structure does not need a power supply and electronic components in transmission. It is basically maintenance-free and saves a lot of operation and management costs in the long run
- It is a clear medium network, completely avoiding electromagnetic interference and lightning effect, and is very suitable for use in areas with poor natural conditions.
- Provides very high bandwidth. EPON can provide 1.25Gb/s symmetrical bandwidth up and down and can be upgraded to 10Gb/s with the development of Ethernet technology. GPON has up to 2.5Gb/s bandwidth.
- This network uses a fan-shaped architecture to keep shared resources to serve a large number of users.
