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The so-called PON network consists of three parts: OLT, ODN and ONU.An OLT device is located at the core of the network topology. It accesses multiple service networks upward and services of multiple users downward through the ODN. It is an important node for service agg...

 Routing is a process in which a router receives a packet from one interface, directs the packet according to its destination address and forwards it to another interface. It is a packet forwarding deviceof network layer which working in the third layer of the OSI refere...

SONET:  synchronous optical network, a digital transmission standard, was introduced in the United States in 1988. The level 1 electrical signal is denoted as STS-1, and the level 1 optical signal isdenoted as OC-1, with a rate of 51.84Mb / s. On this basis,upgrade throu...

The criteria for IPv4 were set out in the late 1970s. In the early 1990s, the application of WWW led to the explosive development of the Internet. With the increasingly complex Internet application types and the diversification of terminal , the provision of global indep...

Sometimes, we may need to execute the same piece of code many times. Generally,program statements are executed sequentially: the first statement in a function occurs first, followed by the second statement, and so on. Programming languages provide multiple control struct...

Optical module is a kind of network interconnection equipment to realize photoelectric signal conversion , and the transponder is a kind of network interconnection equipmen to realizw optical signal regenerative amplification and wavelength conversion. Although the optic...