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Circuit and packet switching
The progressive development of microelectronics has reduced processing costs, permitting high-quality compression and packeting of voice and video. The new technologies enable services like audio and video, formerly available only through circuits or channels, to be conveyed on statistical multiplexing networks, also known as packet-based data networks.
What is circuit switching?
The fixed-telephony world is comprised by infrastructures based on technology known as TDM, in which, to be transmitted, voice must be modulated and demodulated by digital circuits, the so-called circuit switching. In other words, when the receiver is off the hook, a tone sounds indicating that a number may be dialed to establish a connection between subscribers A and B, or a circuit between two points, which will be available for as long as the connection is maintained.
Trópico inherited its name from the circuit-switching technology that revolutionized the Brazilian telephone market. When introduced, in the late eighties, it reduced the prices of telephone terminals from US$ 950 to US$ 150. This technology was developed by CPqD and marketed by Promon. Trópico R and RA exchanges are present all over Brazil, with the highest reliability rates in the market, to make up a gigantic telephone terminal infrastructure.
The modular architecture of its technology has enabled Trópico to enhance its research and become a pioneer in the development of solutions enabling convergence between existing TDM telephone networks and the operator's also available data networks. This solution is the Vectura line, which develops from circuit switching to packet switching, and is state-of-the-art in voice-over-IP technology.
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