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): 49/164頁
文件大小: 1401K
代理商: PSB21911
PSB 21911
PSF 21911
U-Transceiver
Semiconductor Group
49
11.97
2.5.1.3
Scrambler / Descrambler
The scrambling algorithm as defined by ANSI T1.601 ensures that no sequences of
permanent binary 0s or 1s are transmitted. The algorithms used for scrambling and
descrambling are described in
figure 19
. The scrambling/descrambling process is
controlled fully by the IEC-Q TE. Hence, no influence can be taken by the user.
Please refer to page 77 for a description of loop 3.
Figure 19 Scrambler / Descrambler Algorithms
ITD09730
x
-1
Ds
Di
Transmit Scrambler in normal operation without Loop-Back 3
Ds.x
-18
-23
x
Ds
Ds = Di +
-18
x
Ds
Ds.x
-23
+
Transmit Scrambler for Loop-Back 3
x
-1
x
-1
x
-1
x
-1
Ds
Do
Receive Descrambler for Loop-Back 3
.
Do = Ds
+
-18
x
x
-23
+
(1
)
Di
Ds
x
-1
x
-1
x
-1
x
-1
x
-1
-23
Ds x
x
Ds.
-5
Ds = Di +
-5
Ds x
+
-23
Ds x
-23
Ds x
x
Ds
-18
x
-1
x
-1
-1
x
x
-1
x
-1
Do = Ds
Receive Descrambler in normal operation without Loop-Back 3
Do
Ds
-1
x
x
-1
-5
-23
x
(1+
+ x
)
-1
x
x
Ds.
-5
x
-1
-1
x
Ds x
-23
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