Оборудование

ID #1029

DVB-карта Pent@Value


Изготовитель - Pentamedia, Корея.

DVB-карты производства корейской фирмы Pentamedia заслуженно пользуются славой надежных устройств. Фирма основана в 1999 г. в Сеуле с капиталом 5 млн $. Продукция этой фирмы широко используется операторами спутниковой связи.

Приемник Pent@Value предназначен для приема данных - спутниковый доступ в Интернет, групповые и широковещательные рассылки. Он полностью соответствует стандарту DVB/IP. Фильтрация потока полностью программная. Как следствие этого - повышенные требования к компьютеру. Прост в установке и надежен.

Доступно программное обеспечение под Windows 98/Me/2000/XP, Linux. В настоящее время ПО для приема ТВ-каналов отстутствует. Однако, т. к. архитектура карты этому не препятствует, софт несомненно появится.

Приемник Pent@Value в настоящий момент может использоваться только для приема потоков данных. Тем не менее, программная реализация демультиплксора (нет ограничения производительности аппраратного) и отлаженные драйвера позволяют использовать Pent@Value для приема высокоскоростных потоков данных 10 - 20 Мбит/сек и более. Достаточно использовать компьютер соответствующей мощности (известен пример приема потока 30 Мбит/сек).

Аппаратная реализация.

В приёмнике Pent@Value (как и в остальных устройствах Pentamedia) используется тюнер с прямым преобразованием (Direct Conversion) модели Samsung TBMU30112IMH. Внутри тюнера - Down Convertor Mitel SL1925E, и синтезатор частоты SP5769, DVB-frontend HDM8513A.

Питание конвертора - линейный стабилизатор на контроллере LNBP16SP.

Как уже отмечалось выше, НИКАКИХ операций по обработке цифрового потока карта не производит - данные просто передаются через PCI - шину. Функции PCI-моста выполняет чип Conexant FUSION 878A. Шина данных тюнера (8 бит) заведена на старший байт 24-битной GPIO (General Purpose Input-Output) шины FUSION 878 и чип передает данные в память, для обработки драйверами.

Как видно, богатейшие возможности FUSION 878, представляющего из себя видео-декодер - многофункциональное устройство по обработке, захвату аналогового видео-сигнала не используются. Во всяком времени сейчас.

Как можно отметить в технических характеристиках, макс. пропускная способность демультиплексора равна полосе передачи данных по шине PCI в режиме BUS master DMA и составляет 60 Мбит/сек.

Tехнические характеристики

Возможности
Прием данных в стандарте ETS 301 192 (Турбо-Интернет) Да
Прием телепрограмм DVB/MPEG-2 Нет (отсутствует ПО)
Аппаратная обработка потока Нет
Тюнер
Модель Samsung TBMU30112IMH
Тип Прямое преобразование
Down Convertor SL1925E
Синтезатор частоты SP5769
Модуляция QPSK
Совместимость с SCPC и MCPC Оба режима
Входной частотный диапазон 950 - 2150 MHz
Входной уровень несущей -65 ~ -25 dBm
Динамический диапазон 40 dB
Входное сопротивление 75 Ом
Разъем F-56 (Female)
DVB-frontend
Модель HDM8513A
Символьные скорости 1 - 45 Мсимв/с
Поддержка FEC 1/2, 2/3, 3/4, 5/6, 7/8 и авто
Декодер Рида-Соломона 204, 188, Т=8
глубина чередования (интерливинга) 12
фильтр QPSK Root-raised cosine, roll-off 0.35
Питание LNB
Электропитание конвертора 13/18 В, ON/OFF, макс. 350 мА
Защита от КЗ Есть
Управление 22 КГц, DiSEqC 1.0
Демультиплексор
DVB дескремблер программный
Захват потока PES и TS
MAC фильтрация одно- и многоадресная
PID фильтрация до 32 PID
Макс. входной поток до 60 Мбит/сек
Пропускная способность до 60 Мбит/сек
Интерфейс
Шина PCI версия 2.1, PnP
Чип Connexant CN 878
пиковая скорость 132 Мб/с
ширина шины 32 разряда
BUS master DMA до 60 Мбит/сек от карты в память
ПО
Драйверы для ОС Windows 98/Me/2000/XP, Linux
Открытые API/SDK нет
Возможности
- предотвращение конфликтов по прерыванию с другими устройствами
- протоколы UDP/TCP/IP
- поддержка протокола TIS
- поддержка протокола UDLR
- поддержка Multiprotocol Encapsulation (MPE)
- фильтрация одно- и многоадресных MAC
- полная совместимость с ETSI 301.192
- высокоскоростной обмен данными в режиме прямого доступа к памяти (DMA)
Прочее
Габариты 145 x 95 x 17 мм
температурный режим 0° - 50° C
температура хранения от -55° до 85° C
влажность от 10 до 90%

Материал взят с официального сайта www.gs.ru - Корпорация General Satellite

Записи: -

Связанные записи:

Последние обновление: 2007-08-17 12:29
Опубликовал: Maksim
Оценка: 1.88

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