參數(shù)資料
型號: PSB21911
廠商: SIEMENS A G
元件分類: 數(shù)字傳輸電路
英文描述: ISDN Echocancellation Circuit for Terminal Applications IEC-Q TE
中文描述: DATACOM, ISDN ECHO CANCELLER
文件頁數(shù): 42/164頁
文件大?。?/td> 1401K
代理商: PSB21911
PSB 21911
PSF 21911
U-Transceiver
Semiconductor Group
42
11.97
2.5.1
U-Frame Structure
Each basic frame consists of 18 bits for the (inverted) synchronization word; 6 overheads
bits are allocated for system functions, and 216 bits transfer the userdata of 2B + D-
channel (i.e. userdata of 12 IOM-frames is packed into one basic U-frame).
Data is grouped together into U-superframes of 12 ms. The beginning of a new
superframe is marked with an inverted synchronization word (ISW). Each superframe
consists of eight basic frames (1.5 ms) which begin with a standard synchronization word
(SW) and contain 222 bits of information (
table 6
).
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