Datasheet

DS26303: 3.3V, T1/E1/J1, Short-Haul, Octal Line Interface Unit
56 of 101
6.3.1 Transmit Line Templates
The DS26303 the transmitters can be selected individually to meet the pulse masks for E1 and T1/J1 mode. The
T1/J1 pulse mask is shown in the transmit pulse template and can be configured on an individual LIU basis. The
TIMPRM pin/bit is used to select the internal transmit terminating impedance of 100Ω/110Ω for T1/J1 mode or
75Ω/120Ω for E1 mode. The T1 pulse mask is shown in
Figure 6-2 and the E1 pulse template is shown in
Figure 6-3.
Table 6-3. DS26303 Template Selections
TS2, TS1, TS0 APPLICATION
000 E1
001
010
Reserved
011 DSX-1 (0-133 ft)
100 DSX-1 (133-266 ft)
101 DSX-1 (266-399 ft)
110 DSX-1 (399-533 ft)
111 DSX-1 (533-655 ft)
Figure 6-2. T1 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 600100
TIME (ns)
NORMALIZED AMPL I T UDE
T 1 .10 2/8 7 , T 1 .40 3,
CB 119 (Oct. 79), &
I.4 3 1 T e m p la te
-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.
MINIM UM 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.
MINIM UM CURVE
DSX-1 Template (per ANSI T1.102 -1993)
DS1 Template (per ANSI T1.403 -1995)