Enterprise Networking and LAN Optical Fiber transceiver selection (1)

Source: Internet
Author: User

Nowadays, optical transceiver network devices are increasingly used in our network engineering. They are used in small-scale optical fiber trunk connection solutions, so it is better to use optical fiber interfaces for switches in large-scale optical fiber trunk. Because of the various types of optical fiber, wavelength, interface type, rate, and other technical indicators, a wide range of Optical Fiber transceiver products are available. How do we know which optical transceiver to choose? This article attempts to give a summary of the optical transceiver that may be encountered and used in our network engineering.

Fiber optic transceiver is an Ethernet transmission media conversion device that SWAps Ethernet electrical signals and optical signals. It is also called a photoelectric Converter or Fiber optic Converter Fiber Converter ). One end of the optical transceiver is connected to the optical fiber, and the other end is connected to a switch or router through the RJ45 Ethernet interface. The main principle is to convert optical signals and electrical signals through photoelectrical coupling, there is no change in the data encoding format and the network protocol is completely transparent. Fiber Optic Transceiver uses dedicated ASIC chips for data line rate forwarding.

Optical Transceiver Classification

There are two categories of Optical Fiber transceiver, which are divided into two categories: Single-Mode Optical Fiber transceiver and multi-mode optical fiber transceiver. These are the two prerequisites for choosing Optical Fiber transceiver. The single-mode optical transceiver uses a laser light source. The transmission distance is long and can reach 20 km to 120 km. Multi-Mode Optical Fiber transceiver uses LED light source, and supports short transmission distance. It can only transmit data within 2 km to 5 km. Optical fiber Transceiver can also be divided by transmission rate, which can be divided into 10 M, 100 M, M single/multimode transceiver; can be divided into network management and non-network management according to whether the network management is available.

In practice, single-mode optical transceiver is generally used for broadband access to the wide area network of the optical fiber leased line provided by telecom companies for users, multimode Optical Fiber transceiver is generally used in LAN applications such as common enterprise LAN and campus LAN. Multi-Mode Optical Fiber has a large optical power loss, so the transmission distance is not far from the single-mode optical fiber, and the maximum value is 0 ~ 5 km; the optical power loss of single-mode optical fiber is relatively small, so the transmission distance can be far, up to 120 km. In common LAN projects, the distance to be transmitted is not very long. We generally only use multi-mode optical fiber cabling. Therefore, only multi-mode optical fiber transceiver is used for optical fiber transceiver.

Three common optical transceiver types

In actual engineering, we may encounter the following three types of Optical Fiber Transceiver: Network Management m single-mode optical fiber transceiver; non-network management M Multi-Mode Optical Fiber transceiver.

The Network Management m single-mode optical fiber transceiver is used for the broadband access of the optical fiber leased line provided by telecommunications companies. It is generally provided by the local authorities, and is the optical fiber leased line access device that the telecommunications companies put on the user end without the need to purchase. The so-called fiber-optic leased line access is actually the "Last Kilometer" from the bottom of the Metropolitan Area Network of the telecommunications company closest to the user-the access layer switch to the user. As telecom companies use port bandwidth control to allocate bandwidth of 1 M, 2 M, and 10 M to customers, therefore, it is required that the optical fiber transceiver on the client can also implement port bandwidth control to allocate the corresponding bandwidth of 1 M, 2 M, and 10 M, therefore, this optical transceiver must be manageable and can be remotely controlled to facilitate local management.

Non-nms m Multimode Optical Fiber transceiver and non-nms m Multimode Optical Fiber transceiver are what we may use in LAN engineering. It can undertake photoelectric conversion between the vertical trunk and the complex trunk. Nowadays, local area network projects are becoming increasingly popular with optical fiber cables, and the concept of gigabit trunk is also accepted by users, therefore, I believe that the M Multimode Optical Fiber transmitter should be one of the key products of our main LAN optical fiber project.

Common Single-Mode Optical Fiber transceiver provided by local authorities provides a SC-type Optical Fiber Interface and an RJ45 port. The multiplexing technology is used to send and receive data on a single optical fiber, this is because of the shortage of optical fiber lines. In order to avoid the use of a single optical fiber, the civil Single-Mode Optical Fiber Transceiver can use dual-fiber single-mode transceiver. Multimode Optical Transceiver provides two SC-type Optical Fiber interfaces. multimode optical fiber is a dual-fiber transceiver) and an RJ45 port. Some product Transceiver optical fiber interfaces are ST-Type circular bayonet interfaces) but these interfaces are old interfaces, which are gradually unavailable in the industry.

The following is an example of these three types of optical transceiver.

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