1, optical modem is the optical signal into the Ethernet electrical signal equipment, optical modem is originally called modem, is a kind of computer hardware, is in the sending end through the modulation of digital signals into analog signals, and at the receiving end through demodulation analog signals into digital signals a device.
An Optical Network Unit (ONU) is an optical network unit. The ONU is divided into active optical network units and passive optical network units. The ONU is mainly used to receive broadcast data sent by OLTs. In addition to the function of light cat, ONU also has the function of switch.
2, onu is divided into a, b, c class, all three are optical access, but to provide users with the number of ports, port types are different, optical modem is actually a class onu.
Optical modem, also known as optical cat, is a network device that transmits optical signals to other protocol signals through optical fiber media. It is a relay transmission device for large local area network (LAN), metropolitan area network (MAN), and wide area network (WAN). The device is composed of sending, receiving, control, interface, and power supply. It adopts large-scale integrated chip, simple circuit, low power consumption, high reliability, complete alarm status indicator, and perfect network management function.
Optical fiber communication has rapidly developed into the main form of information transmission because of its advantages such as wide frequency band and large capacity. To realize optical communication, optical modulation and demodulation must be carried out. Therefore, as a key device of optical fiber communication system, optical modem is receiving more and more attention. There are two kinds of optical modulators: direct modulator and external modulator, and optical demodulator is divided into two kinds: with and without built-in front amplifier. Direct modulator and demodulator with built-in front amplifier are the focus of this project. Direct modulation has the advantages of simplicity, economy and easy implementation, while the demodulator with built-in front amplifier has the characteristics of high integration and small size.
optical modem is a transmission device that can be connected to the Internet with the connection of the network cable, similar to our Internet light cat, but the upper end of the cat is connected to the circuit, and the upper end of the optical modemis connected to the light path, so it is referred to as light cat. A cat connected to the light path. The lower end of the onu in epon/GPON is connected to the user.
1, optical modem is a kind of onu, is for a single user, optical modem can also be said to be desktop onu.
2, the main onu is for more users, that is, the electrical port has 8 to 24 pon ports. The optical modem only has 1-4 electrical ports.
The difference between optical modem and ONU:
optical modem is generally used when large customers, mainly for dedicated data access.
optical modem card type and desktop, card type generally put machine room.
The desktop is usually placed on the client. ONU is used for broadband residential network access. The main difference is from the integrated room card optical cat to the client desktop optical cat, a pair of optical cats account for a pair of fibers, and from the integrated room OLT to the client multiple ONUs also occupy only a pair of fibers, and the middle goes through a splitting process. The difference between optical modem and ONU is that ONU saves fiber core resources, and optical modem is cheaper, and a pair of light cats are several hundred pieces. What kind to use, comprehensive analysis of the cost, according to the situation.
Post time: Dec-14-2023