With the continuous development of communication technology, since the new equipment of PDH optical transceiver, it has really facilitated us a lot in terms of information transmission. However, it is estimated that most of the small partners don’t know much about this new equipment PDH optical transceiver. , So in order to keep everyone up to date, the editor of Feichang Technology will introduce the PDH optical transceiver and its function and characteristics in detail. Those who want to know about it, let's take a look!
Introduction to
PDH Optical Multiplexer PDH Optical Multiplexer Equipment is a 120-channel photoelectric integrated transmission device composed of super integrated circuits as the core. It is generally a paired application, also called a point-to-point application. The capacity is generally 4E1, 8E1, 16E1; support 4, 8 , 12 or 16 E1 interfaces and 2 100M Ethernet interfaces, suitable for small-capacity switch networking, user loop networks, mobile communications (base stations), private networks, DDN networks, etc. It can provide a centralized machine frame structure that is simple to maintain, ready to use when power is turned on, and provides a complete network management function
PDH network optical transceiver adopts integrated circuits with independent intellectual property rights, applying time division multiplexing technology, digital phase lock and clock extraction technology, and anti-interference 2M interface technology, which is especially suitable for occasions with high reliability requirements and complete auxiliary functions. Pdh optical transceiver pdh optical transceiver such as: China Mobile, China Unicom, telecommunications, electric power, military, highway, aviation and other special communication networks. The hardware part adopts FPGA, which integrates encoding, decoding, information insertion, and alarm switching, which makes the circuit simple and improves the reliability of the whole machine.
The principle of PDH optical transceivers The principles of
different types of optical transceivers are the same, and the optical transceiver consists of a transmitter and a receiver. The transmitting end processes the analog signal of the user end through amplification, A/D conversion, multiplexing, etc., and finally converts the electrical signal into an optical signal that can be transmitted through the optical fiber through the electrical/optical conversion, and then transmits the optical fiber to the receiving end. At the receiving end, the opposite process is performed. First, the received optical signal is restored to an electrical signal through optical/electrical conversion, and the electrical signal is demultiplexed, and then sent to the client through D/A and amplifying and filtering.
The main function of PDH optical transceiver
1. Provide 8 E1 service ports, all-digital clock recovery and smooth phase lock technology;
2. Provide RS232 network management interface, support unified-one-network management;
3. Provide RS485 network management cascade interface, multiple devices It can be managed through the same terminal;
4. Dual power supply, mutual hot backup, optional AC220V, DC48V, etc.;
5. Provide complete local/peer end alarm monitoring, three-color light indication;
6. Support local/remote end E1 trick loopback;
7. Provide a transparent RS232 data channel, with a rate of 300-19.2Kbit/s adaptive.
Advantages of PDH optical transceiver
1. A unified bit rate and a unified interface standard provide the possibility for interconnection between equipment from different manufacturers.
2. Network management capabilities have been greatly enhanced.
3. Put forward a new concept of self-healing network. The ring network form with self-healing protection capability composed of SDH equipment can automatically resume normal communication through the self-healing network when the main signal of the transmission medium is cut off.
4. Byte multiplexing technology is adopted to make the upper and lower branch signals in the network very simple.
Features of PDH optical transceiver equipment
1. Provide 4, 8, 12 or 16 E1 digital interfaces, impedance 75Ω/120Ω optional;
2. Use highly reliable CC3, C coaxial connectors to ensure reliable and stable line connection;
3. Provides 2 channels of 100M Ethernet interface;
4. Provides an official telephone interface (optional);
5. Adopts chip, simple circuit, low power consumption and high reliability;
6. The structure is specially designed with a small skylight, which is convenient for user maintenance and management;
7. Compact or standard 1U frame design, small size, light weight, stable and reliable work, easy to install.
Application of
PDH Optical Transceiver PDH Optical Transceiver uses time division multiplexing technology to mix and encode the E1 signal and transmit it on a pair of optical fibers. Products designed using this chip adopt a single-board design, with high integration, small size, low power consumption, reliable work, and easy installation and use.
In the past telecommunications networks, PDH equipment was mostly used. This series has better adaptability to traditional point-to-point communication. With the rapid development of digital communications, point-to-point direct transmission is becoming less and less, and most digital transmissions have to be switched. Therefore, the PDH series cannot meet the needs of modern telecommunications business development and modern telecommunications network management. Needs. SDH is a transmission system that has emerged to meet this new need.
The first to put forward the SDH concept was the Bell Institute of Communications in the United States, called the Synchronous Optical Network (SONET). It is an organic combination of high-speed, large-capacity optical fiber transmission technology and highly flexible, easy to manage and control intelligent network technology. The original purpose was to achieve standardization on the optical path, so that products of different manufacturers can communicate on the optical path, thereby increasing the flexibility of the network.
Well, the above content is the function of the PDH optical transceiver and the related knowledge of its characteristics that Feichang Technology has compiled and introduced for you. I hope it can be helpful to everyone! Feichang Technology has been specialized in the R&D, production and sales of industrial communication equipment such as optical transceivers, industrial switches, optical fiber transceivers, and protocol converters for 20 years. Welcome to come to understand and exchange.
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