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| 型号： | PEF3452 |
| 厂商： | INFINEON TECHNOLOGIES AG |
| 英文描述： | Line Interface Unit for DS3, STS 1 and E3 |
| 中文描述： | 线路接口单元的DS3中，STS 1和E3 |
| 文件页数： | 43/71页 |
| 文件大小： | 1372K |
| 代理商： | PEF3452 |
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PEF 3452
TE3-LIU V1.3
Interface Description
Preliminary Data Sheet
33
2001-12-05
PRELIMINARY
4.2.5
Pulse Shaper
The internal pulse shaper generates the required pulse shapes for E3, DS3 and STS-1
signals according to ANSI T1.102, T1.404, Telcordia GR-499-CORE and ITU-T G.703).
The specific pulse mask is fulfilled at the crossconnect point at a distance of 0 to 450 ft.
to the transmitter (DS3 requirement).
The maximum line length between a TE3-LIU transmitter and TE3-LIU receiver is
1100 ft. for a coaxial cable of AT
&
T type 728A, 734A or 734D.
4.2.6
Transmit Line Coding
4.2.6.1
AMI Code
The AMI code is defined as a dual rail data signal, where the combinations 00 (
"
0
"
), 10
(
"+
1
"
) and 01 (
"
-1
"
) are valid. Additionally no subsequent
"+
1
"
or
"
-1
"
bits are allowed
(bipolar violations). A dual rail data stream is passed transparently, even if it contains
bipolar violations. A single rail data stream is encoded to a correct AMI coded bipolar
data stream without zero code suppression.
4.2.6.2
B
3
Z
S Code
In the B3ZS line code each block of three consecutive zeros is replaced by either of two
replacements codes which are B0V and 00V, where B represents a pulse which applies
to the bipolar rule (
"+
1
"
or
"
-1
"
) and V represents a bipolar violation (two consecutive
"+
1
"
or
"
-1
"
bits). The replacement code is chosen in a way that there is an odd number of
valid B pulses between consecutive V pulses to avoid the introduction of a DC
component into the analog signal.
The transmit line encoder detects three-zeros pattern sequences and changes them to
the appropriate replacement pattern.
Although B3ZS coding is normally used with single rail NRZ data, the transmit line
encoder accepts either dual rail or single rail data. Bipolar violations in an incoming dual
rail data stream are converted to valid data pulses.
4.2.6.3
HD
B
3 Code
In the HDB3 line code each block of four consecutive zeros is replaced by either of two
replacements codes which are B00V and 000V, where B represents a pulse which
applies to the bipolar rule (
"+
1
"
or
"
-1
"
) and V represents a bipolar violation (two
consecutive
"+
1
"
or
"
-1
"
bits). The replacement code is chosen in a way that there is an
odd number of valid B pulses between consecutive V pulses to avoid the introduction of
a DC component into the analog signal.
The transmit line encoder detects three-zeros pattern sequences and changes them to
the appropriate replacement pattern.
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