Measure the test taker's understanding about the performance of the optical fiber access device.

I have a deep understanding of the specific performance of the optical fiber access device. I may have heard of the optical fiber access device. The following describes the knowledge of the optical fiber access device, how can we make proper use of optical fiber access devices for convenience? The following is a detailed introduction.

There are more and more demands for different types of information. With the increasing demands for various new services, such as IP data, voice, and multimedia images, this has prompted major network operators to change their transmission network environments, in the past, the traditional man and access networks that primarily aimed at carrying Analog voice could not meet the requirements of transmission and processing for a variety of new services in terms of capacity and interface types.

As a result, due to the rapid development of social information, technologies and equipment dedicated to providing new service transmission for man and access networks have rapidly developed. Among them, the development of MSTP multi-service transmission platforms and PON passive optical networks is the most representative, these are the best solutions based on the optical fiber transmission technology to provide a variety of new services on the man or access network.

The optical fiber access technology based on optical fiber cables is the development direction of broadband networks in the future. Its development is inseparable from the development and support of optical fiber access equipment, just like fish and water. When talking about optical fiber access devices, we have to mention their three generations of development experience: the first generation uses a large number of local PDH (optical fiber terminal) devices, including point-to-point and star local devices, and does not have the aggregation function. All adopt the PDH transmission protocol, and there is no optical interface specification.

User Services such as E1 and data services are reconnected using private PDH protocol through remote devices and transmitted to local devices through optical fiber. The local device is connected to the PDH Optical Signal according to the private protocol, and is converted into a PDH interface such as E1. Then, the local device is connected to the backbone/aggregation device through the DDF distribution frame through the cable. Due to the limitations of the PDH protocol, various types of optical fiber access devices quickly become outdated.

In view of the defects of the first generation of devices, some PDH equipment manufacturers have developed the second generation of devices, that is, they have added an SDH-intensive optical fiber Multiplexing) memory card to local devices. The private PDH protocol is still used between the local device and the remote device, and the aggregation function is provided on the local device to reuse the original E1 signal through the SDH HbA card and provide a standard SDH interface. It mainly solves the interconnection problem and unified interface standard between local and Metro backbone devices.

The third generation is SDH direct-through devices, including convergence and non-convergence devices. Due to the wide coverage of the new business, the new generation of SDH direct-through equipment has been able to automatically adapt to SDH for transmission according to SDH specifications; non-converged remote devices can directly connect to the Metropolitan Area Network aggregation layer nodes through the SDH optical interface, which is suitable for business interfaces with less expenditure on the aggregation layer network.

The aggregation type inserts SDH aggregation devices at the local end and aggregates VC12 businesses from multiple directions to the upstream SDH interface, thus saving the number of STM-1 interface cards on Large Capacity Backbone Node equipment. It mainly solves the compatibility issues of various devices and facilitates future upgrades and maintenance. Since the development of optical fiber access equipment, the categories of optical fiber access equipment are becoming more and more obvious due to the continuous update of optical fiber access technology and the increasing number of manufacturers joining in. The main categories are as follows:
◆ Optical Fiber Communication Connection component (applicable for communication and computer network terminal connection), such as optical fiber jumper and optical fiber connection box.
◆ Optical Fiber transceiver (applicable to computer network data transmission), such as optical fiber box, optical fiber coupler and distribution box frame.
◆ Optical cable engineering equipment, Optical Cable Testing Instruments for large-scale engineering), such as optical fiber fusion splitters and optical fiber loss testing instruments.

For the first two categories of optical fiber access device products that we often know and are in contact with, the following section describes the Optical Fiber Communication Connection components and optical fiber Transceiver Devices: A jumper is a cable pair or unit without a connector. It is used to connect various links on the distribution frame.

Optical fiber Jumpers are used for long-distance and local optical transmission networks, data transmission and dedicated networks, and various testing and automatic control systems. The optical fiber distribution device is designed for optical fiber communication equipment rooms. It consists of optical fiber distribution units, cabinets, and racks. Each unit has a maximum wiring capacity of 24 fiber cables and a unit structure of 19 inch chassis. Generally, the height is 9 cm, suitable for standard cabinets or racks.

You can select the number or type of units as needed. It can be used for both optical fiber distribution and optical fiber trunk boxes. It can be separately assembled into optical fiber distribution frames, it can also be installed in a cabinet/rack with a digital distribution unit and an audio distribution unit to form a comprehensive distribution frame.

This device is flexible in configuration, easy to install and use, easy to maintain, and easy to manage. It is one of the essential devices for Small and Medium-sized optical fiber communication equipment rooms to achieve fiber arranging, fiber jumpers, fused fiber cables, and optical fiber cable access. It is applicable to the optical fiber terminal points in the optical fiber access network. It has the optical fiber cable wiring and fusion functions, and can realize flexible jumper and storage of the optical fiber core.

The above equipment for the optical fiber access network greatly improves the data transmission and processing capabilities of the optical fiber access network, and brings two advantages: Solves the remote transmission problem of the access line, make the optical fiber access network wider. In this way, the number of intermediate nodes covering the entire network can be reduced, making the network structure simpler.

It can meet users' needs for a variety of new broadband services and improve the quality of new business data. This solves the "bottleneck" of Traditional copper access networks from the core technology, and lays the foundation for realizing the dream of "fiber to the household. Therefore, in the future, the optical fiber access network should become the main force of the Internet information expressway.