PEF24901HV22XP Lantiq, PEF24901HV22XP Datasheet - Page 49

• Manufacturer Part Number: PEF24901HV22XP
• Manufacturer: Lantiq

Specifications of PEF24901HV22XP

• Control Interface: HDLC
• Lead Free Status / Rohs Status: Compliant

3.5.6
Scrambler
The binary transmit data from the IOM
23 bits, before it is sent to the 4B3T coder. The scrambling algorithm ensures that no
sequences of permanent binary 0 s or 1 s are transmitted.
– The scrambler polynomial in LT mode and NT mode with the analog loop closed is:
– The scrambler polynomial in NT mode with open analog loop 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
interface. The descrambler itself is synchronized after 23 symbols.
– The descrambler polynomial in LT mode with open analog loop is:
– The descrambler polynomial in NT mode or in LT with the analog loop closed is:
3.5.7
For control and monitoring purposes of the activation/deactivation progress the following
signal elements are defined by TS 102 080 and FTZ 1 TR 220.
Encoding Scheme
The table below describes the characteristics of the defined 4B3T signal elements.
Data Sheet
Scrambler / Descrambler
4B3T Signal Elements
z
z
z
z
–
–
–
–
23
23
23
23
+
+
+
+
®
z
z
-2 interface is scrambled with a polynomial of
z
z
–
–
5 –
5 –
18
18
50
+
+
+
+
1
1
1
1
Functional Description
PEF 24901
2002-09-30
DFE-T
®
-2