1. Voice over IP in a Shared Satellite Environment Dean Griffler, Vice President of Sales, Americas iDirect Technologies Reston, Virginia February 2004 Voice over IP in a Shared Satellite Environment Dean Griffler, Vice President of Sales, Americas iDirect Technologies Reston, Virginia February 2004

2. Ubiquitous Worldwide Broadband Coverage Rapid Deployment of Consistent, Secure, Business Class IP Access to Any Business Location Enterprise Class Communications Consistent with terrestrial based IP infrastructure Scalable, Reliable, Adaptable Highest Quality of Service Terrestrial class Quality of Service Have Overcome Many Technical Hurdles That Have Plagued Previous Satellite Technologies Such as The Effects of Latency, Real Time Requirements and Bandwidth Inefficiencies Provides for Secure Communications TDMA Technology Provides Broadband IP Solutions To Enterprises Anywhere in the World TDMA Value

3. Market Presence MRC Data Rates Functions Topology Access Method $120-$300 16K – 128K Service Transaction/POS Narrowband Slotted Aloha Narrow Band POS Market Type $400-$3,000 128K – 4.2Mb Enterprise Applications Shared D-TDMA Broadband $8,000-$50,000 1Mb – 44Mb Telco/Video Broadcast Dedicated Dedicated SCPC SCPC TDMA TDMA Fills The Gap Between Narrowband and Dedicated SCPC

4. SCPC vs. Shared IP – Transmit Traffic Patterns Multi-User Traffic Pattern Time Data Rate Efficient but requires mechanisms to differentiate real time traffic from non-real time traffic to ensure proper application performance. Single User Traffic Pattern (SCPC) Data Rate Time Inefficient and Costly Use of Satellite Bandwidth because IP Traffic Is Bursty and Asynchronous.

5. Advantages of Shared Bandwidth Networks Shared Bandwidth Systems Gaining Favor –Highly Efficient and Cost Effective –But Challenging for Real Time Traffic Jitter Delay Packet Loss Oversubscription (Bandwidth “Starving”) Non-differentiated Packets (IP is IP) Interference From Large Burst Data Traffic Well Suited to Burstable Nature of IP Traffic But, Controlled and Managed Access is Required for Real Time Traffic –Traffic Classification and Prioritization –Queuing Methods

6. Real Time Traffic in a Shared Environment Requires a robust feature set necessary for the reliable transport of real time traffic –Deterministic Transport – Deterministic Time Division Multiple Access (D-TDMA) –QoS (Prioritization of packets) Application QoS Group QoS –Dynamic CIR (Absolute guarantee) –Feathering Timeslot Allocation (Minimize Jitter) –Segmentation and Reassembly of IP Packets (Minimize Delay) –Compressed-RTP – cRTP (Efficiency) –TPC / Uplink Power Control (Reliability)

7. Real Time Traffic Management (RTTM) Feature Set Hub NM-1 Outroute Inroute 12575 NM-1 6 cRTP reduces overall bandwidth required QoS identifies, classifies and prioritizes traffic1 SAR, Fragments and Interleaves to ensure proper dequeuing2 Feathering of Timeslots minimizes jitter affects4 CIR (Static or Dynamic, application Triggered)3 5 Group QoS Ensures proper priority across shared medium 7 QoS, SAR, CIR on the outroute

8. Remote Site Configuration Remote Site 10/100 Mbps Ethernet Switch Video VoIP Phones 10/100 Ethernet VSAT Antenna L-Band IFL Network Operator Partner Simple Deployment… Integrated, single box connection to the LAN No power needed at VSAT Antenna Centrally Managed Enable Broadband Connectivity! Simple Deployment… Integrated, single box connection to the LAN No power needed at VSAT Antenna Centrally Managed Enable Broadband Connectivity! PCs IP Router QoS TPC Accelerator Satellite Modem 3DES Security

9. End-to-End Network Architecture C or Ku-Band Satellite Network Operator Teleport LAN Switch VoIP Phone Remote Client Site Router Internet/ Leased Line/MPLS Enterprise HQ LAN Sitch VoIP Phone Remote Client Site LAN Switch VoIP Phone Remote Client Site VoIP Phone Remote Client Site

10. Applications – VoIP Enterprise Applications Voice over IP Application Prioritized and Protected End-to-End 5IF Hub Chassis VoIP Phone Private or Managed Service

11. Seamless Wi-Fi and other IP-Infrastructure Integration NetModem II+ 5IF Hub Chassis VoIP Phone Applications – WiFi (802.11x) Enterprise Applications MNC Headquarters Internet Dial MNC Supplier Roaming User Public Domain Internet Direct IPSec Gateway Secure Gateway Server Hosting Application Hosting Messaging Regional Office Private Domain IP VPN (MPLS based) Private Dial

12. Solution Options Fixed Antenna, BUC, LNB, Cable, Mounts Fixed Mobile Ease of configuration and setup Maritime Mobile Works with Stabilized Antenna Swift Deploy Rapid Setup Ruggedized Cases

13. Case Studies Provides contingency communications services to the Army and other DOD services For Operation Iraqi Freedom, Tamsco provides satellite connectivity network to 52 sites Army’s Coalition Forces Land Component Command CFLCC) in Kuwait (operating for Iraq) for logistics tracking of equipment and parts. Stratos, provides global communications services and solutions worldwide StratosITek, provides next generation all-digital global connectivity. Supports a range of communications solutions, including Voice-over-IP, file and database server access, Internet, video conferencing, and e-mail. “Stratos specializes in providing enterprise customers operating in remote locations with a variety of superior wireless IP, data, and voice satellite solutions. We are excited about the ability to offer our new StratosITek technology to our customers,” said Jim Parm, Stratos CEO. “We feel that organizations of any size will be able to realize significant benefits from this global solution.”

14. Summary Enterprises are increasingly demanding the same capabilities for their “off network” sites as those that can effectively ride on their terrestrial infrastructure. Broadband-based satellite solutions that are optimized for TCP-IP offer the capability for providing voice, data, and video services to these sites. While such capability has traditionally been provided with dedicated bandwidth (CIR’s), the cost of such services more often outweighed the need / benefit of the solution. Shared, oversubscribed satellite services, taking advantage of the bursty, asynchronous nature of IP, can provide such services in a cost effective manner. However, in order to provide enterprise-class voice (as well as other real time solutions) on such a network, requires a thorough understanding and implementation of a robust set of real time management features. Such services, based on the IP-based iDirect technology are available today to provide such a solution.