VoIP Media Switching System Uses
Picor Active EMI Filters
Voice over Internet Protocol (VoIP) is essentially telephone service accomplished over the Internet. The significant benefits that VoIP can offer include lower cost and greater flexibility than plain old telephone service (POTS). VoIP reduces communication and infrastructure cost by using existing data networks and by not charging for features such as caller ID and call forwarding. That VoIP is billed by the amount of information transmitted and not by time connected reduces the cost even more. Flexibility is improved by being able to transmit more than one call at a time, providing location independence, and offering integration with other services available over the Internet.
A number of methods are available, but a VoIP media switching system can provide carrier-class VoIP for residential distribution. The ability to support large numbers of subscribers with a single platform is key, and systems such as this can support anywhere from 5,000 to 100,000 subscribers. Supporting this many lines requires higher power levels than most other categories of telecommunication systems.
An application such as this could require –48 V (-40 to –60 V) input, approximately 360 W per board and up to 9 A current capability (potentially more for short intervals). In normal operation, the ability to choose between 7 A or 14 A QPI input filter, both in the same form factor, is an attractive advantage. At these power levels, the QPI is less than half the size of competitive passive filters.
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