Nowadays, in the current network communication projects, optical transceivers, optical fiber transceivers, and optical modems can be said to be widely used and highly respected by security personnel. So, are you aware of the difference between these three Clear?
Optical modem is a kind of equipment similar to baseband MODEM (digital modem). The difference from baseband MODEM is that it is connected to a dedicated optical fiber line, which is an optical signal.
It is used for the conversion of photoelectric signal and interface protocol in the wide area network, and the access router is the wide area network access. The photoelectric transceiver uses the conversion of the photoelectric signal in the local area network, but only the signal conversion, without the conversion of the interface protocol.It is generally used for a long distance in the campus network and is not suitable for the environment where twisted-pair cables are deployed. In order to clarify the optical modem, photoelectric transceiver. We need to introduce the environment in which they are used.
Optical Modem, also known as single-port optical transceiver, is a product designed for special user environments. It uses a pair of optical fibers for single E1 or single V. 35 or single 10BaseT point-to-point optical transmission terminal equipment. As the relay transmission equipment of the local network, this equipment is suitable for the optical fiber terminal transmission equipment of the base station and leased line equipment. For multi-port optical transceivers, they are generally called “optical transceivers”. For single-port optical transceivers, they are generally used on the user side. They work similar to the commonly used baseband MODEM for WAN dedicated line (circuit) networking. “Optical modem” and “Optical Network Unit”.
Optical transceivers are only products for data communication. The actual optical transceiver products are varied, useful for cable television transmission, some for telephone transmission, useful for industrial control, and some even integrate “voice, data, image” and other services to access One.
The optical fiber transceiver realizes the signal conversion between single-mode and multi-mode fiber and twisted pair in Ethernet. The optical fiber transceiver is an Ethernet transmission media conversion unit that exchanges short-distance twisted pair electrical signals and long-distance optical signals. Optical transceivers are generally used in actual network environments where Ethernet cables cannot be covered and optical fibers must be used to extend the transmission distance; at the same time, they are helping to connect the last mile of optical fiber lines to metropolitan area networks (belonging to Ethernet technology) and more outer layers. The Internet has also played a huge role.
According to the speed, the optical fiber transceiver can be divided into single 10M, 100M optical fiber transceiver, 10/100M adaptive optical fiber transceiver and 1000M optical fiber transceiver. 10M and 100M transceivers work at the physical layer, and the transceiver products working at this layer forward data bit by bit. This forwarding method has the advantages of fast forwarding speed, high transparency rate, low delay, etc., is better in compatibility and stability, and is suitable for use on fixed-rate links.
The 10/100M optical fiber transceiver works at the data link layer. At this layer, the optical fiber transceiver uses a store-and-forward mechanism to read its source MAC address, destination MAC address, and destination MAC address for each packet received. Data, the data packet is forwarded after the CRC cyclic redundancy check is completed. First, it can prevent some wrong frames from spreading in the network and occupy valuable network resources. At the same time, it can also prevent data packet loss due to network congestion.
According to the structure, it can be divided into desktop type optical fiber transceiver and rack type optical fiber transceiver. The desktop optical fiber transceiver is suitable for a single user, such as meeting the uplink of a single switch in the corridor. Rack-mounted fiber optic transceivers are suitable for multi-user aggregation.
According to fiber, it can be divided into multi-mode fiber transceiver and single-mode fiber transceiver. Due to the different optical fibers used, the transmission distance of the transceiver is different. The general transmission distance of a multi-mode transceiver is between 2 kilometers and 5 kilometers, while a single-mode transceiver can cover a range from 20 kilometers to 120 kilometers. It should be pointed out that due to the difference in transmission distance, the transmit power, receiving sensitivity and wavelength of the fiber optic transceiver itself will also be different. The transmit power of a 5km optical fiber transceiver is generally between -20 to -14db, and the receiving sensitivity is -30db, using a wavelength of 1310nm; while the transmit power of a 120 km optical fiber transceiver is mostly between -5 to 0dB, and the receiving sensitivity is －38dB, using 1550nm wavelength.
According to the number of optical fibers, it can be divided into single-fiber optical transceiver and dual-fiber optical transceiver. Single fiber is to realize the data receiving and sending on an optical fiber. This kind of product adopts the technology of wavelength division multiplexing, and the wavelengths used are mostly 1310nm and 1550nm. Due to the use of wavelength division multiplexing, single fiber transceiver products generally have the characteristic of large signal attenuation. Currently, most of the fiber optic transceivers on the market are dual-fiber products, which are relatively mature and stable.
Well, the above is the introduction about the difference between the optical transceiver, the optical fiber transceiver and the optical modem. I hope it can be helpful to you!