Лабораторная работа № 3
Выполнил
Ахметшин А.Ф
Проверил
Галиуллин Л.А
Цель работы: изучение вопросов конфигурации сетей Fast Ethernet.
Теоретические основы
Среды передачи для сети Fast Ethernet:
- 100BASE-T4 (передача идет со скоростью 100 Mбит/с в основной полосе частот по четырем витым парам электрических проводов);
- 100BASE-TX (передача идет со скоростью 100 Mбит/с в основной полосе частот по двум витым парам электрических проводов);
- 100BASE-FХ (передача идет со скоростью 100 Mбит/с в основной полосе частот по двум оптоволоконным кабелям).
Аппаратура 100BASE-T4
Основное отличие аппаратуры 100BASE-T4 от 100BASE-TX состоит в том, что в качестве соединительных кабелей в ней используются неэкранированные кабели, содержащие четыре витые пары (кабели категории 3, 4 или 5).
Схема объединения компьютеров в сеть ничем не отличается от 100BASE-TX. Длина кабелей не может превышать 100 м (стандарт рекомендует ограничиваться 90 м для 10 % запаса). Между адаптерами и кабелями в случае необходимости могут включаться трансиверы.
Для подключения сетевого кабеля к адаптеру (трансиверу) используются 8-контактные разъемы типа RJ-45, соответствующей категории.
Обмен данными идет по одной передающей витой паре, по одной приемной витой паре и по двум двунаправленным витым парам с использованием дифференциальных сигналов.
Аппаратура 100BASE-TX
Для присоединения неэкранированных кабелей, содержащих две витые пары (волновое сопротивление 100 Ом) используются 8-контактные разъемы типа RJ-45 категории 5. Длина кабеля не может превышать 100 метров. Также используется топология типа “пассивная звезда” c концентратором в центре. Только сетевые адаптеры должны быть Fast Ethernet, концентратор рассчитан на подключение сегментов 100BASE-TX, и кабель должен быть категории 5. Между адаптерами и сетевыми кабелями могут включаться трансиверы.
Предельная длина 100 м в Fast Ethernet определяется заданными временными соотношениями обмена (ограничение на двойное время прохождения). Стандарт рекомендует ограничиваться длиной сегмента в 90 м, чтобы иметь 10% запас.
Аппаратура 100BASE-FX
Аппаратура 100BASE-FX очень близка к аппаратуре 10BASE-FL. Точно также здесь используется топология типа “пассивная звезда” с подключением компьютеров к концентратору с помощью двух разнонаправленных оптоволоконных кабелей. Между сетевыми адаптерами и кабелями возможно включение трансиверов. Оптоволоконные кабели подключаются к адаптеру (трансиверу) с помощью разъемов типа SC, ST.
Максимальная длина кабеля между компьютером и концентратором составляет 412 метров, причем это ограничение определяется временными соотношениями.
Практическая часть
PDV= 62,5*1,112+6*1+100*1+140=315,5
PDV2=9*1+70*1+140=219
315,5<512
219<512
Вывод: сеть корректна
№№ | Наименование | Единица измерения | Количество |
Оборудование |
2. | Репитерный концентратор на 24 порта | шт. | 5 |
3. | Сетевой адаптер | шт. | 50 |
4. | Трансивер | шт. | 20 |
5. | Трансиверный кабель с AUI разьемами на концах | шт. | 20 |
6. | Розетка | шт. | 30 |
7. | Разьемы RJ45 | шт. | 90 |
8. | Маршрутизатор | шт. | 1 |
Материалы |
1. | кабель Belden 1585A | м | 285 |
2. | кабель Belden 1583A | м | 195 |
3. | кабель Belden 1455A | м | 403 |
4. | Оптоволоконный кабель с ST разьемами на концах | м | 570 |
Вывод
Я изучил аппаратуру и порядок подключения стандарта FastEhternet
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