pef22504 Infineon Technologies Corporation, pef22504 Datasheet - Page 106

• Manufacturer Part Number: pef22504
• Description: Quad E1/t1/j1 Line Interface Component For Long- And Short-haul Applications Pef 22504 E, Pef 22504 Ht, Version 2.1
• Manufacturer: Infineon Technologies Corporation

•
•
To reduce the crosstalk on the received signals in long haul applications the QuadLIU
a transmit attenuator (Line Build-Out, LBO) in the data path. This is used only in T1 mode. LBO attenuation is
selectable with the values 0, -7.5, -15 or -22.5 dB (register bits LIM2.LBO(2:1)). ANSI T1. 403 defines only 0 to -
15 dB.
Figure 39
Figure 40
3.9.6.1
After reset XPM2.XPDIS is zero so that programming with XPM(2:0) is selected. The default setting after reset for
the registers XMP(2:0) generates the E1 pulse shape, see
value for T1 mode exists. So after switching into T1 mode, an explicit new programming like described in
is necessary.
If LBO attenuation is selected, the programming of XPM(2:0) will be ignored. Instead the pulse shape
programming is handled internally: The generated pulse shape before LBO filtering is the same as for T1 0 to 40 m.
The given values are optimized for transformer ratio: 1 : 2.4 and cable type AWG24 using transmitter
configurations listed in
= 120
Table 29
LBO
(dB)
0
0
0
0
Data Sheet
By the registers XMP(2:0) compatible to the QuadLIU
XPM2.XPDIS is cleared, see
Or by the registers TXP(16:1), see TXP1, if the register bit XPM2.XPDIS is set, see
For more details see chapter “Operational Description”
and
Measurement Configuration for E1 Transmit Pulse Template
Measurement Configuration for T1/J1 Transmit Pulse Template
QuadFALC
Recommended Pulse Shaper Programming for T1/J1 with Registers XPM(2:0) (Compatible to
QuadFALC V2.1 )
Figure 40
Range
(m)
0 to 40
40 to 81
81 to 122
122 to 162
QuadLIU
Table 28
QuadLIU
with R
TM
load
V2.1 Compatible Programming with XPM(2:0) Registers
and shown in
XPM2
= 100
XL1
XL2
XL1
XL2
Range
(ft)
0 to 133
133 to 266
266 to 399
399 to 533
are used.
Figure
R
R
SER
SER
37. The measurement configurations of
106
XPM0
Hexadecimal
D7
FA
3D
5F
Table
TM
, see
30, but with an unreduced amplitude. No reset
Table 29
(0 to 655 ft)
Cable, Z
0 to 200 m
R
QLIU_pulse_meas_temp_E1
XPM1
22
26
37
3F
QLIU_pulse_meas_temp_T1
load
and
0
U
Table
PULSE
TM
Functional Description
R
offers the ability to place
Table 31
load
30, if the register bit
Rev. 1.3, 2006-01-25
Figure 39
11
11
11
11
XPM2
U
PULSE
and
QuadLIU
PEF 22504
Table
Table 29
with R
32.
load
TM