Аналоговые интерфейсные платы

Интерфейс PSTN, скорее всего (если не требуется обеспечение многоканальной линии или нет денег на то, чтобы каждый месяц менять телекоммуникационное оборудование), будет состоять из одной или более аналоговых схем, для каждой из которых потребуется порт Foreign eXchange Office (FXO).

Digium, компания, спонсирующая разработку Asterisk, выпускает аналоговые интерфейсные платы для Asterisk. На веб-сайте компании можно найти обширный модельный ряд аналоговых карт, включая проверенную временем TDM400P, новейшую TDM800P и плату с высокой плотностью размещения проводников TDM2400P. Например, TDM800P - восьмипортовая базовая плата с возможностью установки максимум двух четырехпортовых модулей FXO или FXS4. Можно приобрести TDM800P с уже установленными данными модулями, а также с модулем для эхоподавления. Более подробную информацию об этих платах можно найти на сайте компании Digium (http://www.digium.com).

Часто их называют TDM-сетями из-за технологии Time Division Multiplexing (мультиплексирование с разделением по времени), применяемой для переноса трафика по PSTN.

Обычно их называют VoIP-сетями, хотя передача голоса по IP-протоколу - не единственный способ передачи речи по сетям пакетной коммутации (передача голоса по сети Frame Relay была очень популярна в конце 1990-х годов).

Эволюция недорогого телефонного оборудования для широкого потребления лишь немного отстает от революции в программном обеспечении для телефонии. Каждую неделю возникают новые компании и поставляют на рынок новые недорогие и отвечающие стандартам устройства.

FXS и FXO являются альтернативным оборудованием для аналоговой схемы. Какой из них потребуется, будет определяться тем, к чему выполняется подключение.

Производством совместимых с Asterisk аналоговых плат также занимаются следующие компании:

  • Rhino (http://www.channelbanks.com).
  • Sangoma (http://www.sangoma.com).
  • Voicetronix (http://www.voicetronix.com).
  • Pika Technologies (http://www.pikatechnologies.com).

Все это компании с хорошей репутацией, выпускающие превосходные продукты.

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