PEF24911HV22XP Lantiq, PEF24911HV22XP Datasheet - Page 63

• Manufacturer Part Number: PEF24911HV22XP
• Manufacturer: Lantiq

Specifications of PEF24911HV22XP

• Control Interface: HDLC
• Lead Free Status / Rohs Status: Supplier Unconfirmed

3.13
The 2B1Q line code is a 4-level pulse amplitude modulation (PAM) code without
redundancy. 2B1Q stands for 2 Binary, 1 Quaternary. In transmit direction two-bit binary
pairs are converted into quaternary symbols that are called quats. In each pair of bits the
first bit is called the sign bit and the second is called the magnitude bit.
the relationship of the bits to quats.
Table 9
The four values listed under ’Quaternary symbol’ in the table above should be
understood as symbol names, not numerical values.
At the receiver, each quaternary symbol is converted to a pair of bits by reversing the
table, descrambled and finally formed into the original bit stream.
Data Sheet
First bit
Encoding/ Decoding (2B1Q)
(sign)
1
1
0
0
2B1Q Coding Table
(magnitude)
Second bit
53
0
1
1
0
Quaternary Symbol
Functional Description
(quat)
+3
+1
-1
-3
Table 9
PEF 24911
2001-07-16
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