psb21391 Infineon Technologies Corporation, psb21391 Datasheet - Page 74

• Manufacturer Part Number: psb21391
• Description: Siemens Codec With Upn Transceiver
• Manufacturer: Infineon Technologies Corporation

Data Sheet
2.3.2
B-channel data on the U
spectrum and to ensure enough pulses are present on the line for a reliable clock
extraction to be performed at the downstream end.
The SCOUT-P(X) therefore contains a scrambler and descrambler, in the transmit and
receive directions respectively. The basic form of these are illustrated in figure 38.
The form is in accordance with the CCITT V.27 scrambler/descrambler and contains
supervisory circuitry which ensures no periodic patterns appear on the line.
Figure 38
Scrambler/Descrambler
Descrambler
Descrambler
OUT
IN
OUT
IN
Scrambler
Scrambler
D
D
s
i
D
D
s
o
Scrambler/Descrambler
+
+
Z
Z
-1
-1
PN
interface is scrambled to give a flat continuous power density
Z
Z
-1
-1
D
D
o
0
= D
= D
Z
D
s
i
Z
D
i
-1
Z
=
s
+
-1
-6
Z
D
s
D
-6
+
(1 + Z
s
64
(
+
D
Z
s
D
-6
Z
s
Z
-7
Z
+
-6
Z
-1
-7
-1
Z
+
-7
Z
)
-7
)
Z
Z
-1
-1
Z
Z
-1
-1
+
D
+
s
D
Z
s
PSB 21391
PSB 21393
-6
Z
-6
Interfaces
2001-03-07
Z
Z
-1
D
-1
ITD05339
s
D
ITD05340
Z
s
-7
Z
-7