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PEB2256HT Datasheet(PDF) 361 Page - Infineon Technologies AG

Part # PEB2256HT
Description  E1/T1/J1 Framer and Line Interface Component for Long and Short Haul Applications
PDF  490 Pages
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Manufacturer  INFINEON [Infineon Technologies AG]
Direct Link  http://www.infineon.com
Logo INFINEON - Infineon Technologies AG

PEB2256HT Datasheet(HTML) 361 Page - Infineon Technologies AG

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FALC56 V1.2
PEB 2256
T1/J1 Registers
Data Sheet
361
2002-08-27
Transmit Pulse-Mask Registers (Read/Write)
Value after reset: 7B
H, 03H, 40H
The transmit pulse shape which is defined in ANSI T1.102 is output on pins XL1 and XL2.
The level of the pulse shape can be programmed by registers XPM(2:0) to create a
custom waveform. In order to get an optimized pulse shape for the external transformers
each pulse shape is internally divided into four sub pulse shapes. In each sub pulse
shape a programmed 5 bit value defines the level of the analog voltage on pins XL1/2.
Together four 5 bit values have to be programmed to form one complete transmit pulse
shape.The four 5 bit values are sent in the following sequence:
XP04 to 00:
First pulse shape level
XP14 to 10:
Second pulse shape level
XP24 to 20:
Third pulse shape level
XP34 to 30:
Fourth pulse shape level
Changing the LSB of each subpulse in registers XPM(2:0) changes the amplitude of the
differential voltage on XL1/2 by approximately 80 mV.
The XPM values in the following table are based on simulations. They are valid for the
following external circuitry: transformer ratio 1:2.4, cable PULB 22AWG (100
Ω), serial
resistors 2
Ω. Adjustment of these coefficients can be necessary for other external
conditions.
70
XPM0
XP12
XP11
XP10
XP04
XP03
XP02
XP01
XP00
(26)
XPM1
XP30
XP24
XP23
XP22
XP21
XP20
XP14
XP13
(27)
XPM2
0
XLT
DAXLT
XP34
XP33
XP32
XP31
(28)
Table 64
Pulse Shaper Programming (T1/J1)
Range in
m
Range in
ft.
XPM0
XPM1
XPM2
XP04-
XP00
XP14-
XP10
XP24-
XP20
XP34-
XP30
hexadecimal
decimal
0 to 40
0 to 133
D7
22
1
23
22
8
2
40 to 81
133 to 266 FA
26
1
26
23
9
2
81 to 122
266 to 399 3D
37
1
29
25
13
2
122 to 162
399 to 533 5F
3F
1
31
26
15
2
162 to 200
533 to 655 3F
CB
1
31
25
18
3



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