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DS26521 Datasheet(PDF) 71 Page - Maxim Integrated Products

Part # DS26521
Description  Single T1/E1/J1 Transceiver
PDF  258 Pages
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

DS26521 Datasheet(HTML) 71 Page - Maxim Integrated Products

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DS26521 Single T1/E1/J1 Transceiver
71 of 258
8.11.2.1
Transmit-Line Pulse Shapes
The DS26521 transmitters can be selected individually to meet the pulse templates for E1 and T1/J1 modes. The
T1/J1 pulse template is shown in Figure 8-18. The E1 pulse template is shown in Figure 8-19. The transmit pulse
shape can be configured for each LIU on an individual basis. The LIU transmit impedance selection registers can
be used to select an internal transmit terminating impedance of 100
Ω for T1, 110Ω for J1 mode, 75Ω or 120Ω for
E1 mode or no internal termination for E1 or T1 mode. The transmit pulse shape and terminating impedance is
selected by LTITSR registers. The pulse shapes will be complaint to T1.102 and G.703. Pulse shapes are
measured for compliance at the appropriate network interface (NI). For T1 long haul and E1, the pulse shape is
measured at the far end. For T1 short haul, the pulse shape is measured at the near end.
Figure 8-18. T1/J1 Transmit Pulse Templates
1.2
0
-0.1
-0.2
-0.3
-0.4
-0.5
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
1.1
-500
-300
-100
0
300
500
700
-400
-200
200
400
600
100
TIME (ns)
T1.102/87, T1.403,
CB 119 (Oct. 79), &
I.431 Template
-0.77
-0.39
-0.27
-0.27
-0.12
0.00
0.27
0.35
0.93
1.16
-500
-255
-175
-175
-75
0
175
225
600
750
0.05
0.05
0.80
1.15
1.15
1.05
1.05
-0.07
0.05
0.05
-0.77
-0.23
-0.23
-0.15
0.00
0.15
0.23
0.23
0.46
0.66
0.93
1.16
-500
-150
-150
-100
0
100
150
150
300
430
600
750
-0.05
-0.05
0.50
0.95
0.95
0.90
0.50
-0.45
-0.45
-0.20
-0.05
-0.05
UI
Time
Amp.
MAXIMUM CURVE
UI
Time
Amp.
MINIMUM CURVE
-0.77
-0.39
-0.27
-0.27
-0.12
0.00
0.27
0.34
0.77
1.16
-500
-255
-175
-175
-75
0
175
225
600
750
0.05
0.05
0.80
1.20
1.20
1.05
1.05
-0.05
0.05
0.05
-0.77
-0.23
-0.23
-0.15
0.00
0.15
0.23
0.23
0.46
0.61
0.93
1.16
-500
-150
-150
-100
0
100
150
150
300
430
600
750
-0.05
-0.05
0.50
0.95
0.95
0.90
0.50
-0.45
-0.45
-0.26
-0.05
-0.05
UI
Time
Amp.
MAXIMUM CURVE
UI
Time
Amp.
MINIMUM CURVE
DSX-1 Template (per ANSI T1.102-1993
DS1 Template (per ANSI T1.403-1995



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