Project Background:

New man using open optical transmission platform, through the integration of a variety of technologies, voice, data, image, multimedia, IP access and a variety of value-added services and intelligent services.

Compared with the ordinary man, the education man obviously has the characteristics of the private network is different from other industries, on the one hand, the education man needs to undertake the regional teaching business activities of network transmission and communication, there is a large number of courseware, multimedia materials need to be transmitted;

On the other hand, the education industry should provide stable quality assurance of streaming media transmission for distance teaching and online teaching.

At the same time, the education man should also have the characteristics of operation and management, so as to provide access management requirements for community users.

WDM is a technology that increases the ability of an optical fiber to transmit information by transmitting multiple signals simultaneously on the same optical fiber at different wavelengths (or colors).

In effect, WDM converts a single fiber into multiple "virtual" fibers, each of which operates independently at a different wavelength.

Compared with other optical fiber transmission technologies, because WDM and optical switching technology are the necessary foundation for the development of all-optical network, its good transparency can avoid waste in the expansion of the main line, especially the huge capacity potential of WDM is incomparable to that of single-wavelength TDM technology.

This advantage is very important in the construction of man in Our country, because the low-cost WDM makes the whole network only need a fiber to connect to the resident network from the trunk, which greatly saves the light resources, and embodies a high degree of unity in both the investment protection and high availability of users.

Colleges and universities have always been a customer base for operators to compete for, with great potential.

Colleges and universities have always had high bandwidth requirements, especially at this stage, the Internet and broadband has become an indispensable part of college students' daily life.

100 megabits or even gigabits of bandwidth are common.

This bandwidth can be in the form of laying your own optical fiber or renting bandwidth from another carrier.

However, as for a city, universities are often sparsely distributed in a city with a diameter of tens of kilometers. Whether they are laid by themselves or rented, it is crucial to improve the utilization rate of optical fibers and to rapidly deploy and access services.

Some new network operators for customer networking, in the competition with some big operators because of the fiber resources are not so rich, the construction of man is not as good as the old traditional operators, so they are required to make full use of the existing fiber and bandwidth resources, the main energy on the access network.

CWDM system has low cost of supporting facilities, personnel training and later maintenance because of its low power, small size and easy to use.

Compared with optical cable engineering: optical cable engineering involves real municipal procedures, urban environment, overhead and ground buried, materials, manpower, project cycle and other comprehensive cost problems, CWDM equipment is opened quickly, low cost.

The CWDM products of SPACECOM series are developed by using coarse wave division multiplexing technology. Multiple optical signals with wavelength interval of 20nm are multiplexed into one optical fiber for transmission, which can improve the communication capacity and expand the bandwidth on the basis of the existing man network, and effectively solve the problem of insufficient optical fiber resources.

Thus it provides a simple, flexible and low-cost solution for man access.

SPACECOM200 multiplexes multi-channel services (including 155M, 622M, 1.25G, and 2.5g) onto a pair of optical fibers for transmission, thus greatly saving optical fiber resources.

At the same time, SPACECOM200 also uses passive active discrete design, which can be placed in a complex metropolitan area network optical fiber node (passive device), while the optical wavelength conversion module (active device) is placed in the customer room, making it very convenient for users to access.

For the network situation and business characteristics of colleges and universities, CWDM technology is of great value to the rapid development of the company's local business and save fiber resources. The following is the CWDM equipment used in each major branch node of the scientific research and education network of colleges and universities.

Network topology:

The four-wave CWDM system equipment of SPACECOM200 from SPACECOM is adopted to provide a 4-channel 155M service interface.

The device is equipped with 220V power supply and an out-of-band network management system.

At the initial stage of the project, two channels were used for transmission of two 155M POS services, the transmission distance was 50Km, and the remaining two channels were reserved for future upgrade.

After five months of operation, CWDM equipment of SPACECOM company operates stably and reliably, and it is easy to maintain.

When the device is connected to the device of other manufacturers, the device does not affect each other and works normally.

The equipment consistency and compatibility test complies with the relevant national standards. The equipment runs well and the NETWORK management system works normally without any abnormal phenomenon.