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ManualsBrandsMAXIM INTEGRATED ManualsInterface ICsInterface IC - telecommunication LIU LQFP 64
71727374757677787980
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 100Ω 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)
NORMALIZED AMPLITUDE
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
Tim
e 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 (pe
r ANSI T1.102-1993
DS1 Template (per ANSI T1.403-1995