參數(shù)資料
型號(hào): PEB2245N
廠商: SIEMENS AG
英文描述: ?Multipoint Switching and Conferencing Unit - Attenuation?
中文描述: ?多點(diǎn)交換和會(huì)議股-衰減?
文件頁(yè)數(shù): 6/70頁(yè)
文件大?。?/td> 1021K
代理商: PEB2245N
Semiconductor Group
6
PEB 2245
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
μ
s. 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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