Switching



The Inter Space
Inter space is a java implementation, which provides a high level common java interface to middleware. It enables re-facing legacy applications using existing development tools like VB. It works like a gateway.
Switching Techniques
Data communication takes place by two devices that are directly connected by some transmission media. Whenever we have multiple devices, we have the problem of how to connect them to make one-to-one communication possible. Its best solution is switching. A switched network consists of a series of interlinked nodes, called switches. Switches are devices capable of creating temporary connections between two or more devices linked to the switch. Consider the following figure-


 


Types of switching-
Circuit Switching: Circuit Switching is a method in which a dedicated communication path is established between two devices through one or more intermediate switches. The telephone system uses this type of switching.

Message Switching: If two devices want to communicate, a temporary link is established for the duration of one message transfer. Physical links are allocated dynamically among devices as required, and are allocated for short periods. Each message is a block of data, with system information. This scheme is similar to post-office mailing system.

Packet Switching: Packet Switching is a method of transmitting messages through a communication network, in which long messages are subdivided into small packets of data. The packets are then transmitted as in message switching. It is a data transmission method that simultaneously routs and transmits data packets form different customers over a communication channel or telephone line, thus optimized use of resources.

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