參數(shù)資料
型號: PEB2445-N
廠商: SIEMENS A G
元件分類: 路由/交換
英文描述: Multipoint Switching and Conferencing Unit - Attenuation MUSAC-A
中文描述: TELECOM, CONFERENCING CIRCUIT, PQCC44
封裝: PLASTIC, LCC-44
文件頁數(shù): 6/70頁
文件大小: 1236K
代理商: PEB2445-N
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
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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