Comparison of various communication technologies

These are very mature technical means, and there are differences in the technology itself, mainly in the application scenarios.

Optical fiber communication: including NGN technology, that is, next generation network technology. It also includes technologies such as PDH/SDH/MSTP/WDM/PON. Large data transmission capacity, long transmission distance, robust network (self-healing ring network) and strong anti-interference ability.

Carrier: it is generally used in the field of private networks, such as power carrier communication, and it is also a popular means of power communication in the early days. Later, with the popularization and application of optical fiber communication technology, it was gradually eliminated. Carrier mainly provides low-speed code stream transmission for data acquisition terminals. Compared with optical fiber communication, carrier has the characteristics of fast channel establishment, saving optical fiber resources (because power lines are used as transmission carriers) and low investment. However, due to the large attenuation of power line, it can not well support the protection of business data and large particle business.

Wireless: including GPRS, WINMAX, WINFI, 3G, microwave, etc.

Advantages of GPRS: always on-line, can realize active reporting; From the perspective of investment cost, network investment cost includes one-time investment and subsequent use and maintenance cost. GPRS is based on the current GSM public network and does not need to invest in network construction cost.

Disadvantages: based on the public network, it is greatly affected by the busy communication during traffic holidays, and the real-time communication cannot be guaranteed; Business interface types are limited.

3G: It is an upgraded version of 2G/2.5G, which supports wireless transmission of high-bandwidth and large-particle data, mainly because the new service access processing platform of 3G base station supports large-capacity service processing and distribution. The intuitive experience is to support multimedia services.

Attached:

Operator communication:

Power line carrier communication uses power transmission line, referred to as PLC technology.

Features:

Borrowing distribution lines as signal transmission channels has small investment and wide coverage;

Extensive network coverage is an ideal medium to realize high-speed network access in remote areas, which can shorten and eliminate the "digital divide" between cities and rural areas, developed areas and underdeveloped areas.

Insufficient:

The application mode of the technology is still immature, and it is necessary to solve the problems of signal attenuation through transformer, reflection influence of signal channel after line switch is turned on due to impedance mismatch, and communication guarantee when line fails. At present, there is no mature and stable communication guarantee mode;

The original intention of power line design is to transmit power signals with frequency of 50~60Hz. When its function is extended to voice or data signal transmission, it will face a complex electromagnetic environment. Transmission line distribution and load are complex, background noise and impulse noise are complex, line interference is strong, and physical layer environment is complex and harsh.

From the practical application effect, it is difficult for power line carrier to meet the requirements of reliability and real-time monitoring of distribution network; At present, it is mainly used in occasions with low real-time requirements, such as meter reading and load control for low-voltage users.

SDH/MSTP

Features:

(1) has rich service types and high bandwidth;

(2) The service bearer is based on TDM, which effectively ensures the real-time performance of the service;

(3) Provide abundant networking modes and service ring network protection means to ensure the reliable transmission of important services;

(4) The network provides abundant maintenance and management means, which is convenient and quick;

(5) All-optical transmission of the whole network is not affected by electromagnetic interference;

Disadvantages:

(1) The whole network needs to be laid with optical cables, and the upfront cost is high;

(2) The support for 64K narrowband service is not enough, and PCM equipment is needed to realize a complete communication solution;