FEASIBILITY ANALYSIS OF NETWORK DESIGN
4.1 Analysis of Results of Design
Once the design is done using GPON FTTH access network, to determine the feasibility of the system will be analyzed using parametric link power budget and rise time budget.
4.1.1 Link Power Budget
Power link budget calculations to determine the total allowable limits attenuation between the transmitter output power and receiver sensitivity. Power link budget calculation is done based on the ITU-T G.984 standards and regulations adopted by the PT. TELKOM is not more than 20 km and a total attenuation of 28 dB is not over.
Form of equations for the calculation of total attenuation on the link power budget as follows:
Form of equations for the calculation of the power margin is:
Description:
Pt = optical output power source (dBm)
Pr = maximum power detector sensitivity (dBm)
SM = Safety margin, ranging from 6-8 dB
α tot = total system attenuation (dB)
L = length of optical fiber (Km)
α c = damping connector (dB / fruit)
α s = Damping connection (dB / connection)
α = attenuation fiber optic fiber (dB / km)
Ns = Number of connections
Nc = Number of connectors
Sp = Damping Splitter (dB)
Required power margin must have a value greater than 0 (zero), the power margin is the remaining power of the transmit power of the net loss during the transmission process, the reduction of the value of the safety margin and a reduction in the value of receiver sensitivity [14].
The data used in the calculation are:
• The output power of the optical source (OLT / ONU): 5 dBm
• The sensitivity of the detector (OLT / ONU): -29 dBm
• Optical fiber attenuation G.652 (1310/1490): (0.35, 0.28) dB / Km
• Optical fiber attenuation G.657 (1310/1490): (0.35, 0.28) dB / Km
• Attenuation Splice: 0:05 dB / splice
• Connectors: 0.2 dB
• Type PS 1:8, 1:4: 11 dB, 7.8 dB
• Number of connections: 4 pieces
• Number of connectors: 4 pieces
Power link budget calculations on GPON will be divided into two parts and will calculate the distance from ONT to STO that is located farthest away, because the wavelength GPON technologies have asymmetric in pentransmisiannya. So if for ONT farthest meet eligibility, then for the shorter distance will meet kelayakan.Panjang wave around 1310 nm for uplink to downlink while around 1490 nm.
The calculations can be described as follows:
Link Power Budget Calculations with the farthest distance is 4.77495 km (3.99335 km STO to ODC, ODC 0.72714 Km to the ODP, ODP to 0.05446 Km ONT) with lines of STO Gegerkalong to ODC C and C41 to the ODP to ONT
downlink
+ Damping Installation
α tot = (3.99335x0.28) + (0.72714x0.28) + (0.05446x0.28) + (4x0.2) + (4x0.05) + (11 +7.8) +2.86497
α tot = 23 951 dB
So for the power margin calculation is as follows:
Pr = Pt - α tot - 6
Pr = 5 - 23951-6
Pr = - 24 951 dBm
M = (Pt - Pr (Sensitivity)) - α total - BC
M = (5 + 29) - 23951-6
M = 4,049 dBm
M values obtained from the calculation turns out to generate the downlink values remained above 0 (zero) dB. This indicates that the link above meets the eligibility link power budget.
uplink
+ Sp + Damping Installation
α tot = (3.99335x0.35) + (0.072714x0.35) + (0.05446x0.35) + (4x0.2) + (4x0.05) + (11 +7.8) + 2.86497
α tot = 24 336 dB
So for the power margin calculation is as follows:
Pr = Pt - α tot - 6
Pr = 5 - 24336-6
Pr = - 25 336 dBm
M = (Pt - Pr (Sessitivitas)) - α total - BC
M = (5 + 29) - 24336-6
M = 3,664 dBm
M values obtained from the calculation turns out to generate uplink values remained above 0 (zero) dB.
This indicates that the link above meets the eligibility link power budget.
4.1.2 Rise Time Budget
Rise time budget is a method to determine the limits of the dispersion of a fiber optic link. This method is very useful for analyzing digital transmission systems. The purpose of this method is to analyze whether the overall network performance has been achieved and is able to meet the desired channel capacity. Generally, the total degradation time of transition from digital link does not exceed 70 percent of the bit period NRZ (Non-Retum-to-Zero) or 35 percent of the period for data bits RZ (Return-to-Zero). One bit period is defined as the reciprocal of the data rate.
Specification tool for the calculation of rise time budget is:
• Wavelength: 1310 nm and 1490 nm
• Spectral width (Δσ) (OLT / ONU): 1 nm / 1 nm
• Rise time light source (ttx) (OLT / ONU): (150x10-3/200 x10-3) ns
• Dispersion of material (Dm) (1310/1490): (3.56 / 13.64) ps / nm.Km
• Rise time receiver (TRX) (OLT / ONU): (150x10-3/200x10-3) ns
• Coding NRZ
• Using a Single Mode
• core refractive index (n1): 1.465
• The refractive index sheath (n2): 1.46
• The radius of the nucleus (a): 4.5 lm
The calculations can be described as follows:
Rise Time Budget calculations with the farthest distance is 4.77495 km (3.99335 km STO to ODC, ODC 0.72714 Km to the ODP, ODP to 0.05446 Km ONT) with lines of STO Gegerkalong to ODC C and C41 to the ODP to ONT
downlink
Downlink Bit Rate (Br) = 2.4 Gbps NRZ format, so that:
tr =
Determining intramodal t / t of material
Tmaterial = Δσ x L x Dm
= 1 nm x 4.77495 x 0.01364 ns Km / nm.Km = 0.0651 ns
Δs = n1-n2
n1
Δs = 3.412x10-3
V = 2π x A x n1 x (2 x Δs) 1/2
λ
V = 2 x 3:14 x 4.5 lm x1, 465 (2x3.412x10-3) 1/2
1.49 lm
= 2.295
twaveguide = L [n2 + n2Δ (vb)]
C dv
twaveguide = 4774.95 [1.46 +1.46 x3.412x10-3x1, 2]
3x108
= 2.333x10-5ns
tintramodal = tmaterial + twaveguide
So that the magnitude of singlemode optical fiber:
ttotal = (ttx tintramodal ² ² + + + TRX tintermodal ² ²) ½
= [(0:15) ² + (2.333x10-5) 2 + (0.0651) ² + (0) 2 + (0.2) ²] 1/2
= 0.2583 ns
From the calculation of the total rise time of 0.2583 ns still below the maximum rise time of the NRZ signal bit rate of 0.2917 ns. Means it can be concluded that the system meets the rise time budget.
uplink
Bit Rate uplink (Br) = 1.2 Gbps NRZ format, so that:
tr =
T determine intramodal
Tmaterial = Δσ x L x Dm
= 1 nm x 4.77495 x 0.00356 ns Km / nm.Km = 0.0169 ns
Δs = 3.412x10-3
V = 2 x 3:14 x 4.5 lm x1, 465 (2x3.412x10-3) 1/2
1.31 lm
= 2.610
twaveguide = 4774.95 [1.46 +1.46 x3.412x10-3x1, 25]
3x108
= 2.333x10-5 ns
So that the magnitude of singlemode optical fiber:
ttotal = (ttx tintramodal ² ² + + + TRX tintermodal ² ²) ½
= [(0.2) ² + (2.333x10-5) 2 + (0.0169) ² + (0) 2 + (0.15) ²] 1/2
= 0.2505 ns
From the calculation of the total rise time of 0.2505 ns rise time is still below the maximum bit rate of the NRZ signal at 0.5833 ns. Means it can be concluded that the system meets the rise time budget.
CHAPTER V
CONCLUSIONS AND RECOMMENDATIONS
5.1 Conclusion
Existing networks now need to hold additional network capacity and migration of copper cable into FTTH access network using GPON technologies in housing Setra ambassador. Based on the results of the feasibility design for a system to link the Power Budget total attenuation obtained at the farthest distance of 23 951 24 336 dB for dB for the downlink and the uplink. It is still within the tolerances specified by the ITU-T G.984 standard 28 dB and Telkom issued by 28 dB. Power margin value obtained from the calculation dBm 4,049 and 3,664 downlink dBm obtained from the calculation turns out to generate uplink values remained above 0 (zero) dB. This indicates that the link meets the eligibility link power budget. Based on the feasibility of the system for the rise time rise time is the total budget available for the downlink direction with bitrate of 2.4 Gbps, customers farthest produce Ttotal at = 0.2583 ns. Ttotal remained below Tsistem value of 0.2917 ns. And uplink with a bitrate of 1.2 Gbps, customers farthest produce Ttotal at = 0.2505 ns. Ttotal still below the value of 0.5833 ns Tsistem thus the system still meets the rise time budget with NRZ coding
4.1 Analysis of Results of Design
Once the design is done using GPON FTTH access network, to determine the feasibility of the system will be analyzed using parametric link power budget and rise time budget.
4.1.1 Link Power Budget
Power link budget calculations to determine the total allowable limits attenuation between the transmitter output power and receiver sensitivity. Power link budget calculation is done based on the ITU-T G.984 standards and regulations adopted by the PT. TELKOM is not more than 20 km and a total attenuation of 28 dB is not over.
Form of equations for the calculation of total attenuation on the link power budget as follows:
Description:
Pt = optical output power source (dBm)
Pr = maximum power detector sensitivity (dBm)
SM = Safety margin, ranging from 6-8 dB
α tot = total system attenuation (dB)
L = length of optical fiber (Km)
α c = damping connector (dB / fruit)
α s = Damping connection (dB / connection)
α = attenuation fiber optic fiber (dB / km)
Ns = Number of connections
Nc = Number of connectors
Sp = Damping Splitter (dB)
Required power margin must have a value greater than 0 (zero), the power margin is the remaining power of the transmit power of the net loss during the transmission process, the reduction of the value of the safety margin and a reduction in the value of receiver sensitivity [14].
The data used in the calculation are:
• The output power of the optical source (OLT / ONU): 5 dBm
• The sensitivity of the detector (OLT / ONU): -29 dBm
• Optical fiber attenuation G.652 (1310/1490): (0.35, 0.28) dB / Km
• Optical fiber attenuation G.657 (1310/1490): (0.35, 0.28) dB / Km
• Attenuation Splice: 0:05 dB / splice
• Connectors: 0.2 dB
• Type PS 1:8, 1:4: 11 dB, 7.8 dB
• Number of connections: 4 pieces
• Number of connectors: 4 pieces
Power link budget calculations on GPON will be divided into two parts and will calculate the distance from ONT to STO that is located farthest away, because the wavelength GPON technologies have asymmetric in pentransmisiannya. So if for ONT farthest meet eligibility, then for the shorter distance will meet kelayakan.Panjang wave around 1310 nm for uplink to downlink while around 1490 nm.
The calculations can be described as follows:
Link Power Budget Calculations with the farthest distance is 4.77495 km (3.99335 km STO to ODC, ODC 0.72714 Km to the ODP, ODP to 0.05446 Km ONT) with lines of STO Gegerkalong to ODC C and C41 to the ODP to ONT
downlink
+ Damping Installation
α tot = (3.99335x0.28) + (0.72714x0.28) + (0.05446x0.28) + (4x0.2) + (4x0.05) + (11 +7.8) +2.86497
α tot = 23 951 dB
So for the power margin calculation is as follows:
Pr = Pt - α tot - 6
Pr = 5 - 23951-6
Pr = - 24 951 dBm
M = (Pt - Pr (Sensitivity)) - α total - BC
M = (5 + 29) - 23951-6
M = 4,049 dBm
M values obtained from the calculation turns out to generate the downlink values remained above 0 (zero) dB. This indicates that the link above meets the eligibility link power budget.
uplink
+ Sp + Damping Installation
α tot = (3.99335x0.35) + (0.072714x0.35) + (0.05446x0.35) + (4x0.2) + (4x0.05) + (11 +7.8) + 2.86497
α tot = 24 336 dB
So for the power margin calculation is as follows:
Pr = Pt - α tot - 6
Pr = 5 - 24336-6
Pr = - 25 336 dBm
M = (Pt - Pr (Sessitivitas)) - α total - BC
M = (5 + 29) - 24336-6
M = 3,664 dBm
M values obtained from the calculation turns out to generate uplink values remained above 0 (zero) dB.
This indicates that the link above meets the eligibility link power budget.
4.1.2 Rise Time Budget
Rise time budget is a method to determine the limits of the dispersion of a fiber optic link. This method is very useful for analyzing digital transmission systems. The purpose of this method is to analyze whether the overall network performance has been achieved and is able to meet the desired channel capacity. Generally, the total degradation time of transition from digital link does not exceed 70 percent of the bit period NRZ (Non-Retum-to-Zero) or 35 percent of the period for data bits RZ (Return-to-Zero). One bit period is defined as the reciprocal of the data rate.
Specification tool for the calculation of rise time budget is:
• Wavelength: 1310 nm and 1490 nm
• Spectral width (Δσ) (OLT / ONU): 1 nm / 1 nm
• Rise time light source (ttx) (OLT / ONU): (150x10-3/200 x10-3) ns
• Dispersion of material (Dm) (1310/1490): (3.56 / 13.64) ps / nm.Km
• Rise time receiver (TRX) (OLT / ONU): (150x10-3/200x10-3) ns
• Coding NRZ
• Using a Single Mode
• core refractive index (n1): 1.465
• The refractive index sheath (n2): 1.46
• The radius of the nucleus (a): 4.5 lm
The calculations can be described as follows:
Rise Time Budget calculations with the farthest distance is 4.77495 km (3.99335 km STO to ODC, ODC 0.72714 Km to the ODP, ODP to 0.05446 Km ONT) with lines of STO Gegerkalong to ODC C and C41 to the ODP to ONT
downlink
Downlink Bit Rate (Br) = 2.4 Gbps NRZ format, so that:
tr =
Determining intramodal t / t of material
Tmaterial = Δσ x L x Dm
= 1 nm x 4.77495 x 0.01364 ns Km / nm.Km = 0.0651 ns
Δs = n1-n2
n1
Δs = 3.412x10-3
V = 2π x A x n1 x (2 x Δs) 1/2
λ
V = 2 x 3:14 x 4.5 lm x1, 465 (2x3.412x10-3) 1/2
1.49 lm
= 2.295
twaveguide = L [n2 + n2Δ (vb)]
C dv
twaveguide = 4774.95 [1.46 +1.46 x3.412x10-3x1, 2]
3x108
= 2.333x10-5ns
tintramodal = tmaterial + twaveguide
So that the magnitude of singlemode optical fiber:
ttotal = (ttx tintramodal ² ² + + + TRX tintermodal ² ²) ½
= [(0:15) ² + (2.333x10-5) 2 + (0.0651) ² + (0) 2 + (0.2) ²] 1/2
= 0.2583 ns
From the calculation of the total rise time of 0.2583 ns still below the maximum rise time of the NRZ signal bit rate of 0.2917 ns. Means it can be concluded that the system meets the rise time budget.
uplink
Bit Rate uplink (Br) = 1.2 Gbps NRZ format, so that:
tr =
T determine intramodal
Tmaterial = Δσ x L x Dm
= 1 nm x 4.77495 x 0.00356 ns Km / nm.Km = 0.0169 ns
Δs = 3.412x10-3
V = 2 x 3:14 x 4.5 lm x1, 465 (2x3.412x10-3) 1/2
1.31 lm
= 2.610
twaveguide = 4774.95 [1.46 +1.46 x3.412x10-3x1, 25]
3x108
= 2.333x10-5 ns
So that the magnitude of singlemode optical fiber:
ttotal = (ttx tintramodal ² ² + + + TRX tintermodal ² ²) ½
= [(0.2) ² + (2.333x10-5) 2 + (0.0169) ² + (0) 2 + (0.15) ²] 1/2
= 0.2505 ns
From the calculation of the total rise time of 0.2505 ns rise time is still below the maximum bit rate of the NRZ signal at 0.5833 ns. Means it can be concluded that the system meets the rise time budget.
CHAPTER V
CONCLUSIONS AND RECOMMENDATIONS
5.1 Conclusion
Existing networks now need to hold additional network capacity and migration of copper cable into FTTH access network using GPON technologies in housing Setra ambassador. Based on the results of the feasibility design for a system to link the Power Budget total attenuation obtained at the farthest distance of 23 951 24 336 dB for dB for the downlink and the uplink. It is still within the tolerances specified by the ITU-T G.984 standard 28 dB and Telkom issued by 28 dB. Power margin value obtained from the calculation dBm 4,049 and 3,664 downlink dBm obtained from the calculation turns out to generate uplink values remained above 0 (zero) dB. This indicates that the link meets the eligibility link power budget. Based on the feasibility of the system for the rise time rise time is the total budget available for the downlink direction with bitrate of 2.4 Gbps, customers farthest produce Ttotal at = 0.2583 ns. Ttotal remained below Tsistem value of 0.2917 ns. And uplink with a bitrate of 1.2 Gbps, customers farthest produce Ttotal at = 0.2505 ns. Ttotal still below the value of 0.5833 ns Tsistem thus the system still meets the rise time budget with NRZ coding
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