- •Laboratory work № 11
- •2 Key positions
- •4 Home task
- •5 Laboratory task
- •6 Protocol content
- •Appendix to the lab № 11 Graphical representation of the expected results
- •Laboratory work № 12
- •2.1 Parameters of the relative influence
- •2.2 Dependence of crosstalk on the length
- •2.3 The dependence of the crosstalk at the near-end and far-end immunity on the frequency
- •4 Home task
- •5 Laboratory task
- •6 Protocol content
- •Appendix to the lab №12 Graphical representation of the expected results
- •2 Key positions
- •2.1 Key concepts
- •2.2 Evaluation of dsl potential characteristics at parallel work on high-capacity telephone cables.
- •3 Key questions
- •4 Homework
- •5 Laboratory task
- •6 Protocol content
3 Key questions
3.1 How do transitive attenuations on near and far end depend on placement of pairs in the cable?
Which solutions is it necessary to make in case of:
reached rate at given network configuration accessible lower than required;
reached length of DSL at given network configuration accessible lower than required;
3.2 How does the length of DSL depend on transmission rate at the same loading scenario, diameter of wire?
3.3. How does the length of DSL depend on loading of cable via xDSL lines?
3.4 How does the length of DSL depend on diameter of wire at the same scenario of load, transmission rate and noise?
3.5 How does the length of DSL depend on the noise at the same transmission rate, scenario of load and diameter of cable?
4 Homework
4.1 Answer the key questions
4.2 Prepare the protocol in accordance to laboratory task.
5 Laboratory task
5.1 Get acquainted with the program interface of the "xDSL-Lіner".
5.2 Set the given parameters in accordance with the brigade number (TS, cable type, line length, PSD noise, loading scripts).
Table 5.1 – Transmission systems variant
|
№ of brigade |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
|
Transmission systems tyte (technology) xDSL |
ADSL |
ADSL2+ |
VDSL A |
VSDL B |
ADSL |
ADSL2+ |
VDSL A |
VSDL B |
|
Cable type (layer twisting) |
ТПП 20х2х0,5 |
ТПП 30х2х0,5 |
ТПП 30х2х0,4 |
ТПП 20х2х0,4 | ||||
|
PSD noise, dBp/Hz |
–140 |
–130 |
–135 |
–140 |
–135 |
–140 |
–130 |
–135 |
|
Cable length, km |
2 |
2,5 |
0,5 |
0,7 |
1,5 |
2 |
0,4 |
0,6 |
|
Loading scripts (used pare numbers) |
0, 2, 4, 7, 11, 13, 15 |
1, 3, 6, 9, 15, 17, 19 |
0, 5, 7, 8, 14, 18 ,20, 29 |
1, 3, 6, 7, 10, 12, 16, 22, 26 |
2, 7, 12, 15, 19, 23, 25, 28 |
3, 4, 8, 9, 12, 14, 18, 21, 23, 27, 29 |
1, 5, 7, 10, 12, 13, 16 |
0, 3, 5, 6, 8, 11, 16 |
5.3 Determine the achievable transmission rate for each of the given DSL (each given pair). Calculate the arithmetical mean value of the achievable transmission rate. Determine the pair cable with the worst and the best noise characteristic for the selected parameters (free, you can take a new system). Find the optimal location (or placement) of the DSL in cable and define the achievable transmission rate for each of the DSL at that location. Calculate the arithmetical mean value of achievable transmission rate for optimal location of DSL. Compare arithmetical mean value of achievable transmission rate for the initial and the optimal location of pares. Make explanation.
5.4 For given type of the TS and a given type of cable to determine the achievable transmission rate depending on the cable diameter, cable length, PSD noise and the loading scripts.
The results writed in the Tables 5.2 - 5.7. Build the graphs. Make explanation.
Table 5.2 – Dependence of the transmission rate from loading scripts and core cable diameter with PSD noise minus 140 dBp/Hz and cable length l1 *
|
Core diameter, mm |
Transmission rate |
Loading, % | |||||||||
|
10 |
20 |
30 |
40 |
50 |
60 |
70 |
80 |
90 |
100 | ||
|
0,32 |
RD, Мbit/s |
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RU, Мbit/s |
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0,4 |
RD, Мbit/s |
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RU, Мbit/s |
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0,5 |
RD, Мbit/s |
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RU, Мbit/s |
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*Comment. For variants 1, 2, 5, 6 (ADSL & ADSL2+ technology) cable length is l1 = 1 km, l2 = 2 km, l3 = 1 km, and for variants 3, 4, 7, 8 (VDSL A & VDSL B technology) – l1 = 0,5 km, l2 = 1 km, l1 = 1,5 km.
Table 5.3 – Dependence of the transmission rate from loading scripts and core cable diameter with PSD noise minus 100 dBp/Hz and cable length l1 *
|
Core diameter, mm |
Transmission rate |
Loading, % | |||||||||
|
10 |
20 |
30 |
40 |
50 |
60 |
70 |
80 |
90 |
100 | ||
|
0,32 |
RD, Мbit/s |
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RU, Мbit/s |
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0,4 |
RD, Мbit/s |
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RU, Мbit/s |
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0,5 |
RD, Мbit/s |
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RU, Мbit/s |
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Table 5.4 – Dependence of the transmission rate from loading scripts and core cable diameter with PSD noise minus 140 dBp/Hz and cable length l2 *
|
Core diameter, mm |
Transmission rate |
Loading, % | |||||||||
|
10 |
20 |
30 |
40 |
50 |
60 |
70 |
80 |
90 |
100 | ||
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0,32 |
RD, Мbit/s |
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RU, Мbit/s |
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0,4 |
RD, Мbit/s |
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RU, Мbit/s |
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0,5 |
RD, Мbit/s |
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RU, Мbit/s |
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Table 5.5 – Dependence of the transmission rate from loading scripts and core cable diameter with PSD noise minus 100 dBp/Hz and cable length l2 *
|
Core diameter, mm |
Transmission rate |
Loading, % | |||||||||
|
10 |
20 |
30 |
40 |
50 |
60 |
70 |
80 |
90 |
100 | ||
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0,32 |
RD, Мbit/s |
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RU, Мbit/s |
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0,4 |
RD, Мbit/s |
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RU, Мbit/s |
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0,5 |
RD, Мbit/s |
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RU, Мbit/s |
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Table 5.6 – Dependence of the transmission rate from loading scripts and core cable diameter with PSD noise minus 140 dBp/Hz and cable length l3 *
|
Core diameter, mm |
Transmission rate |
Loading, % | |||||||||
|
10 |
20 |
30 |
40 |
50 |
60 |
70 |
80 |
90 |
100 | ||
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0,32 |
RD, Мbit/s |
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RU, Мbit/s |
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0,4 |
RD, Мbit/s |
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RU, Мbit/s |
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0,5 |
RD, Мbit/s |
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RU, Мbit/s |
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Table 5.7 – Dependence of the transmission rate from loading scripts and core cable diameter with PSD noise minus 100 dBp/Hz and cable length l3 *
|
Core diameter, mm |
Transmission rate |
Loading, % | |||||||||
|
10 |
20 |
30 |
40 |
50 |
60 |
70 |
80 |
90 |
100 | ||
|
0,32 |
RD, Мbit/s |
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RU, Мbit/s |
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0,4 |
RD, Мbit/s |
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RU, Мbit/s |
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0,5 |
RD, Мbit/s |
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RU, Мbit/s |
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According to the results of calculations to build graphs of the transmission rate dependence in the downstream RD and in the upstream RU directions from the loading scripts of the cable (in one coordinate system to visual comparison is represented three graphs for different core cable diameters).
5.5 Upon completion of the work to draw conclusions about the dependence of achievable transmission rate of loading scripts cable, core diameter, cable length and PSD noise.