Предельная помехоустойчивость и затухание сигнала

Во многих технологиях передачи необходимо устанавливать предельную помехоустойчивость или дополнительную буферную зону между уровнями сигнала и шума, присутствующего в физическом канале передачи.

Минимальное предельное значение задается для того, чтобы значение частоты появления ошибочных битов (Bit Error Rate — BER) не превышало 10"7 и чтобы либо уровень шума незначительно возрастал, либо уровень сигнала незначительно уменьшался. Когда соотношение сигнал/шум (Signal-to-Noise Ratio — SNR) становится слишком маленьким, в потоке данных появляется чрезмерное количество ошибок.

Реальный предел помехоустойчивости в любой заданный момент времени можно определить, повышая уровень шума, начиная со значения SNR в текущий момент времени, до тех пор пока не будет превышено значение BER, равное 10"7. Величина, на которую может возрасти уровень шума прежде, чем появится чрезмерное количество ошибок, и есть реальный запас помехоустойчивости. Такой тест иногда проводят, установив значение нижнего предела равным 0 дБ и повышая уровень шума до тех пор, пока значение BER не перейдет границу в 10 7.

Уровень шума может возрасти по разным причинам, как и уровень сигнала. В результате снижения уровня сигнала или роста уровня шума снижаются значение SNR и предел помехоустойчивости. Когда сигнал поглощается, значение SNR (и предельная помехоустойчивость) снижается.

Чем выше скорость передачи в канале DSL, тем ниже значение соотношений SNR, и чем ниже скорость передачи в канале DSL, тем выше значение SNR. Следовательно, предел помехоустойчивости будет ниже в более длинных кабелях или при более высокой скорости передачи в канале DSL. Когда значение BER не может оставаться ниже 10'7, обычно скорость передачи в канале DSL автоматически снижается (т.е. повторяется процесс подготовки к соединению).

Технология DSL с адаптацией скорости передачи (rate adaptive DSL — RADSL) — это технология, в которой скорость передачи корректируется так, чтобы можно было сохранять необходимое значение запаса помехоустойчивости, что позволяет поддерживать значение BER ниже 10"7.

Исследования показали, что оптимальные значения запаса помехоустойчивости для служб DMT составляют 6 дБ для нисходящего потока и 6 дБ — для восходящего потока данных.

Не стоит конфигурировать службу DSL с запасом помехоустойчивости, превышающим оптимальное значение, поскольку система, для того чтобы обеспечить указанный предел, будет готовиться к соединению с очень низкой скоростью передачи данных по каналу DSL. Не следует также задавать слишком низкое значение предела помехоустойчивости, например, 1 дБ для нисходящего потока и 1 дБ для — восходящего, т.к. незначительное увеличение уровня шума в линии передач, вероятнее всего, приведет к чрезмерному количеству ошибок и процессу повторной подготовки к установлению соединения на более низкой скорости передачи по каналу DSL.

Если протяженность канала DSL максимальна (используется максимальная длина кабеля), и модем не будет согласовывать параметры соединения, значения пределов помехоустойчивости с целью нахождения неисправностей можно взять равными нулю. Например, если канал DSL подготавливается к соединению с установленным значением предельной помехоустойчивости, равным нулю, но при этом не согласовывает параметры соединения, когда установлены значения 6 дБ, то это, вероятно, означает, что протяженность канала максимальна (обычно 18 ООО футов 24-жильного провода, 5,5 км провода диаметром 0,5 мм) или же что на линии наблюдается очень высокий уровень шума. Если необходимо предоставить услугу любой ценой, можно временно выбрать компромиссное предельное значение помехоустойчивости (между нулем и 6 дБ). В таком случае важно определить источник проблем — находится он в спектре нисходящего потока или же в спектре восходящего потока данных, — и внести соответствующие корректировки. Например, чтобы обеспечить желаемое значение скорости передачи в канале DSL с длиной провода, равной 18 ООО футов, возможно, понадобится установить значение запаса помехоустойчивости равным 3 дБ.

Помехоустойчивость также улучшается за счет увеличения уровня мощности передачи, но это приведет к интерференции с другими службами в этом же кабеле.

В большинстве мультиплексоров доступа и оборудовании СРЕ сообщается как предусмотренное, так и реальное значения предельной помехоустойчивости для каждого канала DSL. Если реальное значение предела выше предусмотренного при заданной скорости передачи по каналу DSL, то такой канал будет обеспечивать приемлемую частоту появления ошибок. Если после согласования параметров соединения реальное значение запаса помехоустойчивости оказывается ниже предусмотренного, весьма вероятно, что количество ошибок станет чрезмерным, и впоследствии процесс согласования параметров повторится на более низкой частоте передачи по каналу DSL.

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