
QuadFALC
TM
PEF 22554 E
Functional Description E1/T1/J1
Data Sheet
124
Rev. 1.2, 2006-01-26
3.7.5.2
Programming with TXP(16:1) Registers
By setting of register bit XPM2.XPDIS the pulse shape will be configured by the registers TXP(16:1) (TXP1_E).
Each of these registers define the amplitude value of one sampling point in the symbol. A symbol is formed by 16
sampling points.
The default setting after reset for the registers TXP(16:1) generates also the E1 pulse shape (0 m), but with an
unreduced amplitude. (TXP(9:16) = 00
H; TXP(1:8) = 38H= 56D) No reset value for T1 mode exists. So after
switching into T1 mode, an explicit new programming like Table 29 is necessary.
The pulse shape configuration will be done also by the registers TXP(16:1) if LBO attenuation is selected. The
pulse shape is then determined by both the values of TXP(16:1) and the LBO filtering.
The given values in Table 29 and Table 30 are optimized for transformer ratio: 1 : 2.4; cable: AWG24 and
Table 28
Recommended Pulse Shaper Programming for E1 with registers XPM(2:0) (Compatible to
QuadFALC )
R
SER
Z
0
Transmit Line
Interface Mode
XPM0
XPM1
XPM2
[
][]
Hexadecimal
7.5
1)
1) The values in this row refers to an ideal application without any parasitics. Any other parasitic resistances have to be taken
into account when calculating the final value of the output serial resistors.
120
Non generic
9C
03
00
7.5
75
Non generic
BD
03
00
---
Reset values
7B
03
40
7.5
DCIM Mode
Non generic
EF
BD
07
Table 29
Recommended Pulse Shaper Programming for T1 with registers TXP(16:1)
LBO
Range
TXP values, decimal
[dB]
[m]
[ft]
123
45678910
11
12
13
14
15
16
0
0 to 40
0 to 133
46
4646
444444444416-17 -14 -14 -4
-4
0
40 to 81
133 to 266 48
50
48
46
44
16
-17 -14 -14 -4
-4
0
81 to 122
266 to 399 56
58
54
52
48
16
-25 -17 -14 -4
-4
0
122 to 162 399 to 533 63
63
58
56
52
51
16
-34 -32 -17 -4
-4
0
162 to 200 533 to 655 63
63
58
50
-60 -26 -20 -12 -8
-6
-4
7.5
--
46
4646
444444444416-17 -14 -14 -4
-4
155
--
46
4646
444444444416-17 -14 -14 -4
-4
22.5
--
46
44
16
-17 -14 -14 -4
-4
Table 30
Recommended Pulse Shaper Programming for E1 with registers TXP(16:1)
R
SER
Z
0
Transmit
Line
Interface
Mode
TXP values, decimal
[9[]
1
2345678910
11
12
13
14
15
16
2
1)
120
Generic
42
40
42
000000
00
7.5
120
Non generic 63
57
-4
00000
00
2
75
Generic
42
40
000000
00