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- PCM30 bezeichnet eine Anwendung des mit Puls-Code-Modulation (PCM) beschriebenen Verfahrens, bei dem ein analoges Signal binär codiert wird. Zur Anwendung kommt es beispielsweise beim Telefonieren. Der Begriff wird heute meist als Synonym für das 30 • 64-kbit/s-Signal verwendet. Diese Bitrate wird auch in der ersten Stufe der europäischen PDH-Technik verwendet, weswegen PCM30 auch als E1 bezeichnet wird. Ursprünglich bezeichnete es ein Gerät in der Nachrichtentechnik, das 30 analoge Telefonsignale in einen digitalen Bitstrom von 2048 kbit/s umsetzen kann. (de)
- The pulse-code modulation (PCM) technology was patented and developed in France in 1938, but could not be used because suitable technology was not available until World War II. This came about with the arrival of digital systems in the 1960s, when improving the performance of communications networks became a real possibility. However, this technology was not completely adopteduntil the mid-1970s, due to the large amount of analog systems already in place and the high cost of digital systems, as semiconductors were very expensive. PCM’s initial goal was that of converting an analog voice telephone channel into a digital one based on the sampling theorem. PCM30 describes an application of pulse-code modulation (PCM) in which 30 telephony analog signals are binary coded into a digital signal stream. The term is used today mostly as a synonym for the encoding of 30 channels each with a signalling rate of 64-kbit/s. This rate is also used in the first stage of European PDH technique, so PCM30 is also known as E1. Originally it described a device in communications technology which converted the 30 analog telephone signals into a digital bit stream of 2048 kbit/s.......... (en)
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- PCM30 bezeichnet eine Anwendung des mit Puls-Code-Modulation (PCM) beschriebenen Verfahrens, bei dem ein analoges Signal binär codiert wird. Zur Anwendung kommt es beispielsweise beim Telefonieren. Der Begriff wird heute meist als Synonym für das 30 • 64-kbit/s-Signal verwendet. Diese Bitrate wird auch in der ersten Stufe der europäischen PDH-Technik verwendet, weswegen PCM30 auch als E1 bezeichnet wird. Ursprünglich bezeichnete es ein Gerät in der Nachrichtentechnik, das 30 analoge Telefonsignale in einen digitalen Bitstrom von 2048 kbit/s umsetzen kann. (de)
- The pulse-code modulation (PCM) technology was patented and developed in France in 1938, but could not be used because suitable technology was not available until World War II. This came about with the arrival of digital systems in the 1960s, when improving the performance of communications networks became a real possibility. However, this technology was not completely adopteduntil the mid-1970s, due to the large amount of analog systems already in place and the high cost of digital systems, as semiconductors were very expensive. PCM’s initial goal was that of converting an analog voice telephone channel into a digital one based on the sampling theorem. (en)
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