Здесь Вы найдете обзорные статьи в которых рассматривается различное оборудование, проводится его анализ, сравнение с аналогами других фирм-производителей.
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Справочная информацияЗдесь Вы можете найти справочную информацию по частотным планам ТВ каналов для различных стандартов, а также преобразование усиление/ослабление. QAM – (Quadrature Amplitude Modulation – Модуляция методом Квадратичных Амплитуд) – это технология передачи цифрового информационного потока в виде аналогового сигнала. Это достигается путем разделения несущей волны на две несущие одинаковой частоты сдвинутые относительно друг-друга на 90о, каждая из которых промодулирована по одному из двух или более дискретных уровней амплитуды. Комбинация всех уровней амплитуды на этих двух несущих представляет собой бинарную битовую картину. Fast Ethernet – спецификация IEЕЕ 802.3 u официально принятая 26 октября 1995 года определяет стандарт протокола канального уровня для сетей работающих при использовании как медного, так и волоконно-оптического кабеля со скоростью 100Мб/с. Новая спецификация является наследницей стандарта Ethernet IEЕЕ 802.3, используя такой же формат кадра, механизм доступа к среде CSMA/CD и топологию звезда. Эволюция коснулась нескольких элементов конфигурации средств физического уровня, что позволило увеличить пропускную способность, включая типы применяемого кабеля, длину сегментов и количество концентраторов. Ниже описаны общие положения для построения систем коллективного приема спутникового сигнала с использованием мультисвичей TERRA. Ниже приведены краткие пояснения сути основных характеристик оптических делителей. Многие из этих параметров также применимы и к другим пассивным оптическим компонентам. Согласно Рекомендации Международного Союза Электросвязи (ITU-T) G.694.1, для систем DWDM с канальным интервалом ΔF допустимая центральная частота канала f (в ТГц) определяется по таблице. Для облегчения идентификации волокон в кабеле FinMark и удобства при монтаже применяется цветовая маркировка оптических волокон. Если в оптическом модуле располагается более 1 волокна, то волокна окрашены в различные цвета.
По мере расширения областей применения оптических волокон в различных участках телекоммуникационной сферы, совершенствовались сами волокна, обретая новые параметры, оптимизированные для разных задач. В настоящее время применяется несколько типов оптических волокон, характеристики которых регламентированы рекомендациями Международного Союза Электросвязи.
Обозначение оптического кабеля FinMark состоит из нескольких групп букв и цифр, означающих следующее: |
