Cape Town, South Africa

Transcription

1 8 th SADC SUPERVISORY BOARD MEETING Cape Town, South Africa WP1.1 : Agenda Item 7.1 : Report of AFI VSAT Managers Meeting Date: March 2011

2 Summary of Presentation This presentation covers the following tasks conducted by the Technical Group of the AFI Aeronautical VSAT Managers Meeting: Summary of the GAP analysis conducted Design philosophy and revision of the ATN connectivity diagramme Utilization of existing infrastructure Technical solutions considered Spectrum requirements Costing of various solutions Spares options Projected Life-cycle costing Recommendations Proposed technical solution for the AFI Region

3 Summary of GAP Analysis/1 In accordance with the Best Practices established at the AFI VSAT/1 meeting, an in depth GAP analysis was conducted by the Technical Team A copy of the complete GAP analysis will be published on the ESAF ICAO website and the following is a brief summary of the most important GAPs found: Basically two access satellite methods are utilized in the four relevant VSAT networks i.e. FDMA and TDMA. Operation on a single access method is essential to ensure seamless operation Three out of the four networks operate on the same satellite it is therefore important to establish operation on the fourth network on the same satellite, or to establish an alternative solution to ensure cost effective interconnectivity An NCC is not available for all networks and efficient management is lacking in some of the networks and must be addressed effectively in a new solution.

4 Summary of GAP Analysis/1 Maintenance philosophies, fault reporting procedures and management of spares differs significantly this must still be addressed by the Technical Team All services are dependent on a single satellite and a cost effective solution must be investigated together with discussions with Intelsat to ensure continuity of services in case of disruption or failure of IS10-02 Availability of sufficient spectrum could become a problem in future that will have to be addressed effectively by the VSAT Managers in cooperation with Intelsat The deficiencies as listed above and others must be address in the technical solution proposed by the Technical Group.

5 Original ATN BB Connectivity as proposed by ATN Task Force

6 ATN Task Force Regional Connectivity

7 Design Philosophy: From original to New AFI ATN Network Design/1 The objectives established by the First AFI Aeronautical VSAT Managers meeting (AFI VSAT/1) in Durban, KwaZulu-Natal as applicable to the Technical Group are listed below: Develop a sustainable and integrated/interoperable VSAT network to provide aviation communications services in the AFI Region. Upgrade the technical capabilities of the networks to comply with the global best practice, user requirements and ICAO s requirement Achieve the ATN concept for AFI Apply appropriate cost-effective technologies.

8 Design Philosophy: From original to New AFI ATN Network Design/2 Together with the objectives of the AFI VSAT/1 the inter-regional connectivity of the original ATN BB Router connectivity design by the ATN Task Force was studied and the following criteria were applied to identify the shortcomings: Any two regions must be connected by at least two circuits; and The two circuits must be independent The following changes were therefore proposed: The interconnection between AFISNET and NAFISAT contained effectively only one circuit i.e. N'Djamena /Khartoum. It was therefore necessary to add the Brazzaville/Nairobi circuit.

9 Design Philosophy: From original to New AFI ATN Network Design/3 Similarly there was also only one connection between SADC2 and CAFSAT. A node was therefore added at Luanda as well as a circuit between Luanda and Recife. It must also be noted that Luanda is part of CAFSAT although the site has not yet been implemented. In the case of SADC and NAFISAT there were two connections, however both are connected to Nairobi and the two connections are therefore not independent. It was therefore proposed to add another circuit between Khartoum and Kinshasa to resolve this. The same argument also apply to SADC/AFISNET, albeit to a lessor extend and a Brazzaville/Luanda circuit is therefore included.

10 Design Philosophy: From original to New AFI ATN Network Design/4 A similar problem exists between CAFSAT and AFISNET where there are not two independent circuits. It is however difficult to resolve this in a cost effective manner and will have to be addressed at a later stage. The following additional circuits were also added: Jeddah/Khartoum and Jeddah/Addis Ababa to address connectivity with the Middle East region. Conakry/ Dakar and Conakry/Niamey Accra/Dakar and Accra/Niamey Kano/Niamey and Kano/N'Djamena These circuits were added basically because the nodes are not operated and maintained by ASECNA although they are part of AFISNET.

11 Design Philosophy: From original to New AFI ATN Network Design/5 The circuit Dakar/Alger was removed (to reduce the number of circuits operating from/to Dakar (8 in total) and to get a more balanced distribution) Considering the above rational, the following Regional connectivity was developed.

12 New Revised Regional AFI ATN Connectivity

13 Revised AFI ATN Network/1 Using the new revised connectivity of the ATN a new connectivity diagram was developed. The proposed solution of the Technical Group is based on the following fundamental assumptions: All four networks i.e. AFISNET, SADC2, NAFISAT and CAFSAT have made substantial investment in their existing infrastructure, which have not yet reached the end of operational life Three of the networks operate on the same satellite i.e. IS The exception is CAFSAT, however connectivity can be establish between this network and the AFI Region by obtaining spectrum on the Global beam of IS It will be endeavored to establish a single satellite access method for the proposed technical solution to provide the most cost effective solution, while taking into account operational and financial aspects

14 Revised AFI ATN Network/2 Existing infrastructure will be utilized where possible to reduce the cost of implementing the AFI ATN network. Although the new solution will mainly support IP based applications, provision must still be made for services based on legacy protocols for the foreseeable future. The overlay network must be secure and not dependent on terrestrial services located outside the security areas of the ANSP's, in other words where the ANSP does not have any control over its availability, management, etc.

15 Revised AFI ATN Network/3 It was envisaged by the Technical Team that by implementing the revised ATN connectivity requirements as an overlay on top of the existing networks the above fundamental assumption will be complied with i.e. The investment in all four networks will be retained in the short/medium term. The services from the lower networks can be transferred to the upper layer as and when required It is the intention to operate all four networks on the same satellite thereby ensuring interoperability Establishing the same satellite access method will ensure seamless operation

16 Revised AFI ATN Network/4 The implementation of the ATN overlay will be cost-effective as existing infrastructure will be utilized The bottom layers (existing networks) will continue to support applications based on legacy protocols, while the new upper (overlay) network will support all IP based applications ANSP will have full control over the ATN Network availability, management, etc. The result is shown in the following slide and is the revised ATN Overlay that will be proposed to APIRG/18 for approval:

17 ATN Overlay Connectivity as Proposed by Technical Group/1

18 ATN Overlay Connectivity as Proposed by Technical Group/2 AFI ATN OVERLAY IP6 IP4 IP6 IP4 IP6 IP4 IP6 IP4 IP6 IP4 IP6 IP4 IP6 IP4 IP6 IP4 IP6 IP4 IP6 IP4 IP6 IP4 IP6 IP4 CAFSAT NAFISAT AFISNET SADC/2

19 Utilising Existing Infrastructure/1 Option A : TDMA - IDU IDU (Typical NAFISAT/SADC2 VSAT Terminal) User application: ATS/DS User application: AFTN FRAD Frame Relay Access device IDU5000 Indoor Unit Active Combiner RFT Radio Frequency Transmitter RFT Radio Frequency Transmitter CPE AMHS IP ROUTER IDU7000 Modem Active Splitter LNB LNB AIDC CAD TBD... Switch New Equipment Existing Equipment

20 Utilising Existing Infrastructure/2 Option C - FDMA Comtech: IDU (Typical AFISNET VSAT Terminal) User application: ATS/DS User application: AFTN FAD Frame Relay Access device Modem Combiner TWT/SSPA TWT/SSPA LNB CPE AMHS AIDC Contech CDM570L Modem Splitter LNB CAD TBD... Contech CDM570L Modem Number of modems depends on number of circuits New Equipment Existing Equipment

21 Technical Solutions Considered The following solutions were considered: A TDMA solution using NDSatcom Skywan IDU 7000 equipment An FDMA solution using Datum PSM500 modems, SDM9220 FRAD equipment and Cisco router equipment An FDMA solution using Comtech modems and Cisco router equipment The following configurations for each of the above options were costed: Indoor equipment in configuration (i.e. Main equipment only) Indoor equipment in configuration (i.e. Main and Standby equipment)

22 Spares Options Considered The following spares options were considered and costed for comparison purposes: Option 1: Provision of one set of spare equipment for each of the 4 regions. This is typical of what will be required if each region has its own centralised maintenance centre. Option 2: Provision of one set of spares for each VSAT node. This is typically of what will be required for decentralised maintenance for 25 nodes. Option 3: A hybrid maintenance setup which is a combination of the above options. In this case AFISNET & CAFSAT will have decentralised- and SADC & NAFISAT centralised maintenance

23 Spectrum Requirements A network sizing was completed for both network access techniques and the required carrier traffic and satellite bandwidth calculated for both FDMA and TDMA. The carrier sizes as calculated and its associated parameters were entered into the INTELSAT Transmission software program (LST) to calculate the required occupied bandwidth. The occupied satellite bandwidth for both the FDMA and TDMA is given in the table below: FDMA MHz TDMA MHz The calculations are based on certain assumptions for comparison purposes and the final values may be different

24 IDU in Configuration IDU in Configuration Cost Comparisons of VSAT Solutions The costs are for comparison purposes and may differ for the final solution Cost Comparison of VSAT Solutions for an AFI ATN Network (including Option 3 Spares) Region --> Option A (TDMA) IDU7000 Percentage of Total cost Option B (FDMA) Datum PSM500 Modem & SDM9220 Percentage of Total cost Option C (FDMA) Comtech CDM 570 L Percentage of Total cost Option D (TDMA) IDU7000 Percentage of Total cost Option E (FDMA) Datum PSM500 Modem & SDM9220 Percentage of Total cost Option F (FDMA) Comtech CDM570L Percentage of Total cost NAFISAT Region SADC Region AFISNET Region CAFSAT Region Total Cost for AFI ATN Network $ 435, $ 569, $ 859, $ 670, $ 2,535, % 22.5% 33.9% 26.5% $ 647, $ 825, $ 1,233, $ 847, $ 3,553, % 23.2% 34.7% 23.8% $ 587, $ 749, $ 1,133, $ 802, $ 3,272, % 22.9% 34.6% 24.5% $ 593, $ 662, $ 1,016, $ 767, $ 3,038, % 21.8% 33.4% 25.2% $ 995, $ 1,266, $ 1,782, $ 1,125, $ 5,170, % 24.5% 34.5% 21.8% $ 814, $ 1,035, $ 1,483, $ 992, $ 4,325, % 23.9% 34.3% 22.9%

25 Life-Cycle Cost Comparison: Configuration Option A (TDMA: 1 + 0) USD Interest Rate = 9% Capex (including Spares Option 3) 2,535, Period (years) = 6 Operational cost/month: a) Spectrum Cost 15, b) Maintenance TBD Life-cycle cost Year 1 Year 2 Year 3 Year 4 Year 5 Year 6 Total for 5 Years Cost of capital (9%, 6 years) 565, , , , , , ,390, Operational cost 188, , , , , , Option C (FDMA Comtech: 1 + 0) Capex (including Spares Option 3) 3,272, Operational cost/month: a) Spectrum Cost 15, USD Grand Total 4,332, b) Maintenance TBD Life-cycle cost Year 1 Year 2 Year 3 Year 4 Year 5 Year 6 Total for 5 Years Cost of capital (9%, 6 years) 729, , , , , , ,377, Operational cost 187, , , , , , Grand Total 5,314,164.97

26 Life-Cycle Cost Comparison: Configuration Option D (TDMA: 1 + 1) USD Capex (including Spares Option 3) 3,038, Operational cost/month: a) Spectrum Cost 15, b) Maintenance TBD Life-cycle cost Year 1 Year 2 Year 3 Year 4 Year 5 Year 6 Total for 5 Years Cost of capital (9%, 6 years) 677, , , , , , ,064, Operational cost 188, , , , , , Option F (FDMA: Comtech 1 + 1) Capex (including Spares Option 3) 4,325, Operational cost/month: a) Spectrum Cost 15, USD Grand Total 5,005, b) Maintenance TBD Life-cycle cost Year 1 Year 2 Year 3 Year 4 Year 5 Year 6 Total for 5 Years Cost of capital (9%, 6 years) 964, , , , , , ,785, Operational cost 187, , , , , , Grand Total 6,722,703.24

27 Recommendations Considering the calculated cost options, it was recommended that the Option D, i.e. the TDMA solution (satellite access method) be accepted as the preferred technical solution. This decision is proposed for the following reasons: Of the options considered both TDMA solutions are lower in cost than the FDMA solutions in 1+0 and 1+1 configurations. Subsequently one has to consider which of the TDMA configurations to recommend: Although Option D (TDMA 1+0) has a lower Life-Cycle cost than Option F (TDMA 1+1), the proposed ATN solution will form the backbone network structure for the AFI Region and availability must be maximised This can be done by using the TDMA 1+1 solution. It must also be noted that Option F also includes the spares Option 3 i.e. a hybrid maintenance setup. This is the maintenance philosophies presently supported by the AFISNET/CAFSAT and SADC/NAFISAT Regions. If the is recommended the maintenance philosophies have to be reconsidered thus reducing the cost advantage of the 1+0 over 1+1 solution. The configuration was therefore recommended by the Technical Group

28 Final Proposed Solution/1 Option D-1 : TDMA - IDU IDU (Typical NAFISAT/SADC2 VSAT Terminal) User application: ATS/DS User application: AFTN FRAD Frame Relay Access device IDU5000 Indoor Unit Active Combiner RFT Radio Frequency Transmitter RFT Radio Frequency Transmitter CPE AMHS IP IDU7000 ROUTER Modem Active Splitter LNB LNB AIDC CAD TBD... Switch IDU7000 New Equipment ROUTER Modem Existing Equipment

29 Final Proposed Solution/1 User application: ATS/DS User application: AFTN User application: VHF Option D-2: FDMA + TDMA Overlay: IDU IDU (Typical AFISNET VSAT Terminal) FAD Frame Relay Access device Number of modems depends on number of circuits Modem Combiner TWT/SSPA TWT/SSPA LNB IP IDU7000 Splitter LNB CPE AMHS ROUTER Modem AIDC CAD TBD... Switch IDU7000 ROUTER Modem New Equipment Existing Equipment

30 Thank You