IP Real-Time Traffic Management Across Shared Satellite Networks Rash Jhanjee, Sales Manager MEA Nov 8th 2003
Lowest Cost of Ownership Lowest Operating Cost Low Capital Cost Unparalleled Configuration Flexibility Access Multiple Satellites from Single Hub Five Function Remote Most Efficient Use of Transponder Capacity 1.2 Carrier Spacing (14% Gain) Turbo Product Codes (20% Gain) Discontiguous Transponder Assignment Enterprise Class IP Application Extension VoIP QoS cRTP (50% Gain) Highest Data Quality Our Value “In 2001-02, teleport operating companies saw a spike in their Internet and IP transport business, with the average operator generating 16 percent of revenues from IP in 2002, compared with 3 percent in 1998!” -SatNews iDirect Can Help Your IP Growth Strategy by Providing:
Market Presence Narrow Band POS Broadband SCPC Slotted Aloha D-TDMA Dedicated SCPC Narrowband Shared Dedicated Transaction/POS Enterprise Applications Telco/Video Broadcast 16K – 128K Service 128K – 4.2Mb 1Mb – 44Mb $120-$300 $400-$3,000 $8,000-$50,000 i D I R E C T iDirect Technologies Fills The Gap Between Narrowband and Dedicated SCPC Market Type Access Method Topology Functions Data Rates MRC
Traditional Satellite Issues Legacy VSAT Service iDirect “Enabled” Solution Ethernet-like Speed Anywhere • Up to 9.1Mbps downstream • Up to 4.2 Mbps Upstream Narrow Band, Low Speed Shared vs. Dedicated • Unique bandwidth allocation algorithms greatly improves bandwidth efficiency and reduces monthly telco costs Expensive Connectivity High Network Availability • Superior error correction techniques eliminate weather related performance degradation • Automatic End-to-End power control Unreliable in Bad Weather Enterprise Class Solution • Up to 98% channel throughput • Application QoS • cRTP Performance Constraints Fully Integrated Enterprise Class • Single Box Solution (modem, router, QoS, Encryption, Acceleration) • Fully Managed Solution Costly to Manage
SCPC vs. Shared IP – Transmit Traffic Patterns Multi-User Traffic Pattern Data Rate Efficient but requires mechanisms to differentiate real time traffic from non-real time traffic to ensure proper application performance. Time Single User Traffic Pattern (SCPC) Inefficient and Costly Use of Satellite Bandwidth because IP Traffic Is Bursty and Asynchronous. Data Rate Time
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 • Important to Network Operators • More Customers Per Transponder • More Cost Effective Bandwidth Utilization • 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
Real Time Traffic Management (RTTM) Feature Set Group QoS Ensures proper priority across shared medium 5 Outroute Inroute CIR (Static or Dynamic, application Triggered) 3 1 2 5 75 QoS, SAR, CIR on the outroute NM-1 7 Feathering of Timeslots minimizes jitter affects 4 Hub SAR, Fragments and Interleaves to ensure proper dequeuing 2 NM-1 QoS identifies, classifies and prioritizes traffic 1 cRTP reduces overall bandwidth required 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)
Typical Teleport Configuration Redundant Architecture 1. 2. 3. 4. 5. Private Network NMS Server & Spare Control Ethernet Segment Corporate VPN 5IF Hub Chassis RF UpLink Internet/Backbone Router Router ProtocolProcessors iDirect Equipment NMS GUI (Configuration & Monitoring) Up to 20 Transponders
Remote Configuration Network Operator Partner Simple Deployment… • Integrated, single box connection to the LAN • No power needed at VSAT Antenna • Centrally Managed • Enable Broadband Connectivity! Remote Site Video iDirect Components PCs 10/100 Mbps Ethernet Switch L-Band IFL VSAT Antenna LAN 10/100Ethernet NetModem II Plus SIP Phones
iDirect Products • Easy Over-the-Air Upgrades • One Box Solution • Feature Rich Our VSAT Products Support Enterprise Customers Application Requirements NetModem II Plus 5 in 1 Solution • IP Router • Satellite Modem • TPC Accelerator • QoS • Link Encryption
3DES Link Encryption Security Headquarters LAN/WAN Remote Site LAN 3DES Link Encryption Hub NetModem NetModem II+ IP Router Ethernet Switch Protocol Processor Secure VPN IP Router Internet Private IP Networks Enterprise Security without Affecting Performance
Enterprise Class Application Support
iDirect Enabled Partners
Summary • Enterprise networks continue to expand and real time applications such as voice / video are a requirement for virtually every network implementation. • The solution is either to implement costly dedicated bandwidth (SCPC) or to build cost effective shared networks that have been designed from the ground up to support latency sensitive real time data. • This cannot be a simplistic check mark QoS feature, but a robust set of features that are required as network-wide conditions cause bottlenecks and additional latency. • Detailed Understanding of not only Satellite but IP as well, is Imperative to Meet the Needs of the Customer
Questions/Closing Please contact the following individuals with any questions or requests: Rash Jhanjee Sales Manager MEA iDirect Technologies +44 7961 017510 rjhanjee@idirect-tech.com Joshua Cohen New Business Development Manager iDirect Technologies 10803 Parkridge Boulevard Reston, VA 20191 703.648.8174 jcohen@idirect-tech.com - or - www.idirect-tech.com
Back-Up Slides
QoS and Prioritization Features LAN Traffic Service Queues Satellite Network • Traffic prioritization can be performed using • Destination IP Address • Source IP Address • Destination TCP Port Number • Source TCP Port Number • Diffserv and ToS Bits • Protocol (TCP, UDP, RTP, IGMP, ICMP) • Configurable Queue Lengths For Each Service Level • A percentage of bandwidth assigned to each service level • Configurable drop policy • CIR can be configured on the upstream • Traffic can be rate limited in both directions
Network Aware Group QoS Network Inroute 1 Inroute 2 Inroute 3 Inroute 4 rt nrt rt nrt rt nrt rt nrt Prioritization • Hierarchical Prioritization Capability • Truly the Most Flexible QoS Capability • The Most Comprehensive Prioritization Capability Prevents non real time traffic from one remote impacting Real Time Traffic on a different and unrelated remote
Dynamic CIR Ded. TS Total Bandwidth Available – 64K Dynamic CIR Allows Dynamic Allocation of BW if not being used NM1 – Dynamic Allocation since space available NM1 – 16K CIR NM1 – Total Capacity Available Since others are not active CIR Per Remote NM2 – 16K NM4 – 16K NM1 – 16K NM3 – 16K Rapid Ramp-up time • Allows Operators to set “true” Committed Information Rate (CIR) values for remotes in the upstream directions. • Allows support for CIR Based SLAs without locking up bandwidth when not required • Based on statistical analysis, oversubscribe their networks. • If demand is less than CIR, only the actual demand is granted • Capable of indicating certain QoS service levels “trigger” a CIR request
Timeslot Feathering Allocation VoIP Packets VoIP Packets VoIP Packets Frame 1 Frame 2 Frame 3 Delay • Jitter is a big problem with VoIP and TDMA Networks • Delay Variation has to be minimized for proper operation Delay Significant variation in delay causes jitter. VoIP Packets VoIP Packets VoIP Packets Frame 1 Frame 2 Frame 3 Delay Minimal variation in delay significantly reduces jitter.
SAR – Segmentation and Reassembly • Ensure minimal delay for high priority, small packet traffic • Fragmentation and Interleaving allows for minimal delay in dequeuing FTP Packets (1500 Byte) 5 4 3 2 1 Dequeue RF Out b a 1 The Large FTP Packet will delay voice in a congested state j i h g f e d c b a VoIP Packets (60 Byte) QoS Distributor FTP Packets (1500 Byte) 6 5 4 4 4 4 3 3 3 3 2 2 2 2 1 1 1 1 Dequeue RF Out 1 d c b a 1 As packets are divided into equal sized packets, a voice packet has to wait a maximum of one burst. m l k j i h g f e d c b a VoIP Packets (60 Byte) SAR QoS Distributor
Compressed RTP • Allows for a more efficient use of satellite bandwidth • Benchmarks • 11.5 Kbps per voice call with G. 729 compression • 8.5 Kbps per voice call with G.723a compression • Overall VoIP calls using cRTP achieves a 50% savings in bandwidth.
