IP Networking Over Satellite (3 day)
This three-day course is designed for satellite engineers and managers in military, government and industry who need to increase their understanding of how Internet Protocols (IP) can be used to efficiently transmit mission-critical converged traffic over satellites. IP has become the worldwide standard for converged data, video, voice communications in military and commercial applications. Satellites extend the reach of the Internet and mission-critical Intranets. Satellites deliver multicast content anywhere in the world. New generation, high throughput satellites provide efficient transport for IP. With these benefits come challenges. Satellite delay and bit errors can impact performance. Satellite links must be integrated with terrestrial networks. IP protocols create overheads. Encryption creates overheads. Space segment is expensive. There are routing and security issues. This course explains techniques that can mitigate these challenges. Quantitative techniques for understanding throughput and response time are presented. System diagrams describe the satellite/terrestrial interface. Detailed case histories illustrate methods for optimizing the design of converged real-world networks to produce responsive networks while minimizing the use and cost of satellite resources. The course notes provide an up-to-date reference. An extensive bibliography is supplied.
What you will learn:
- IP protocols at the network, transport and application layers. Voice over IP (VOIP)
- The impact of IP overheads and the off the shelf devices available to reduce this impact: WAN optimizers, header compression, voice and video compression, performance enhancement proxies, voice multiplexers, caching, satellite-based IP multicasting.
- How to deploy Quality of Service (QoS) mechanisms and use traffic engineering to ensure maximum performance (fast response time, low packet loss, low packet delay and jitter) over communication links
- How to use satellites as essential elements in mission critical data networks.
- How to understand and overcome the impact of propagation delay and bit errors on throughput and response time in satellite-based IP networks.
- Impact of new coding and modulation techniques on bandwidth efficiency – more bits per second per hertz
- How adaptive coding and modulation (ACM) can improve bandwidth efficiency
- How to link satellite and terrestrial circuits to create hybrid IP networks
- How to use statistical multiplexing to reduce the cost and amount of satellite resources that support converged voice, video, data networks with strict performance requirements
- Link budget tradeoffs in the design of TDM/TDMA DAMA networks
- Standards for IP Modems: DVB in the commercial world, JIPM in the military world
- How to select the appropriate system architectures for Internet access, enterprise and content delivery networks
- The impact on cost and performance of new technology, such as LEOs, Ka band, on-board processing, inter-satellite links, traffic optimization devices, high through put satellites such as Jupiter, Viasat-1.After taking this course you will understand how to implement highly efficient satellite-based networks that provide Internet access, multicast content delivery services, and mission-critical Intranet services to users around the world.
- Overview of Data Networking. Packet switching vs. circuit switching. Seven Layer Model (ISO). Wide Area Networks including, ATM, Aloha, DVB. Local Area Networks such as Ethernet. Physical communications layer.
- The Internet and its Protocols. The Internet Protocol (IP). Addressing, Routing, Multicasting. Transmission Control Protocol (TCP). Impact of bit errors and propagation delay on TCP-based applications. User Datagram Protocol (UDP). Introduction to higher level services. NAT and tunneling. Use of encryptors such as HAIPE and IPSec. Impact of IP Version 6.
- Quality of Service Issues in the Internet. QoS factors for streams and files. Performance of voice over IP (VOIP). Video issues. Response time for web object retrievals using HTTP. Methods for improving QoS: ATM, MPLS, DiffServ, RSVP. Priority processing and packet discard in routers. Caching and performance enhancement. Use of WAN optimizers, header compression, caching to reduce impact of data redundancies, and IP overheads. Performance enhancing proxies reduce impact of satellite delay. Network Management and Security issues including impact of encryption in IP networks.
- Satellite Data Networking Architectures. Geosynchronous satellites. The link budget, modulation and coding techniques. Methods for improving satellite link efficiency (bits per second/Hz)–including adaptive coding and modulation (ACM) and overlapped carriers. Ground station architectures for data networking: Point to Point, Point to Multipoint using satellite hubs, Full mesh networks. Shared outbound carriers incorporating DVB. Return channels for shared outbound systems: TDMA, CDMA, Aloha, DVB/RCS. Suppliers of DAMA systems. Full mesh satellite networks. Military, commercial standards for DAMA systems. The JIPM IP modem and other advanced modems.
- System Design Issues. Mission critical Intranet issues including asymmetric routing, reliable multicast, impact of user mobility: small antennas and pointing errors, low efficiency and data rates, traffic handoff, hub-assist mitigations. Comm. on the move vs. comm. on the halt. Military and commercial content delivery case histories.
- Predicting Performance in Mission Critical Networks. Queuing models to help predict response time based on workload, performance requirements and channel rates. Single server, priority queues and multiple server queues. A design case history, using queuing models to determine how much bandwidth is needed to meet response time goals in a point to point, mission-critical voice and data network. Use of simulation to predict performance.
- TDMA/DAMA Design Examples. Integrating voice and data requirements in a mission-critical Intranet using TDMA/DAMA. Cost and bandwidth efficiency comparison of SCPC, standards-based TDMA/DAMA and proprietary. Tradeoffs for cost effectiveness.
- A View of the Future. Impact of Ka-band and spot beam satellites. Benefits and issues associated with Onboard Processing. LEO, MEO, GEOs. Descriptions of current and proposed commercial and military satellite systems including MUOS, GBS and the new generation of commercial high throughput satellites (e.g. ViaSat 1, Jupiter). Low-cost ground station technology.
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