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参数资料
| 型号： | PEF80902 |
| 厂商： | INFINEON TECHNOLOGIES AG |
| 英文描述： | 4B3T Second Gen. Modular ISDN NT(Ordinary) |
| 中文描述： | 4B3T二将军模块化综合业务数字网新台币（普通） |
| 文件页数： | 29/83页 |
| 文件大小： | 1168K |
| 代理商： | PEF80902 |
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PEF 80902
Functional Description
Data Sheet
21
2001-11-12
2.3.4.1
Monitoring of Code Violations
The running digital sum monitor (RDSM) computes the running digital sum from the
received ternary symbols by adding the polarity of the received user data (+ 1, 0,
–
1). At
the end of each block, the running digital sum is supposed to reflect the number of the
next column in
Table 8
.
A code violation has occurred if the running digital sum is less than one or more than four
at the end of a ternary block, or if the ternary block 0 0 0 (three user symbols with zero
polarity) is found in the received data.
If at the end of a ternary block no error was found, the running digital sum retains its
current value. If the counter value is greater than 4, it is set to 4 at the beginning of the
next ternary block, if its value is 0 or less, it is set to one. So after a code violation has
been detected, the RDSM synchronizes itself within a period depending on the received
data pattern. Note there are some transmission errors which do not cause a code
violation.
2.3.5
Scrambler / Descrambler
Scrambler
The binary transmit data from the IOM
-2 interface is scrambled with a polynomial of
23 bits, before it is sent to the 4B3T coder. The scrambler polynomial is::
Descrambler
The received data (after decoding from ternary to binary) is multiplied with a polynomial
of 23 bits in order to recover the original data before it is forwarded to the IOM
-2
interface.The descrambler is self synchronized after 23 symbols. The descrambler
polynomial is::
The scrambling / descrambling process is controlled fully by the T-SMINTO. Hence, no
influence can be taken by the user.
0 + 0,
0 +
–
+ + 0,
–
0
–
1
1
1
1
1
1
0
1
1
1
0
1
0 0
–
Table 9
4B3T Decoding Table
(cont
’
d)
z
23
–
z
18
–
1
+
+
z
23
–
z
5
–
1
+
+
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