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PEB2445-N Datasheet(PDF) 6 Page - Siemens Semiconductor Group |
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PEB2445-N Datasheet(HTML) 6 Page - Siemens Semiconductor Group |
6 / 70 page Semiconductor Group 6 02.96 PEB 2445 Overview The figure below shows the general architecture of a digital exchange. Figure 1 General Exchange Architecture System Background Digital exchanges put calls through by newly arranging the speech signals coded with 8-bit words (PCM time-slots). The code words are transmitted serially on PCM lines. The sampling frequency of 8 kHz produces PCM frames with a duration of 125 µs. The transmission rate on the line determines how many code words (speech channels) can be accommodated within a sampling period. With a data rate of 2048 kbit/s for example, there are 32 time-slots of 8 bits each. 4 lines with a data rate of 8192 kbit/s have a transmission capacity of 512 channels. |
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