High Performance Ka-Band Networks
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1 Networks Without Barriers High Performance Ka-Band Networks STM Norway AS June,
2 Multi-Beam Ka Band Networks Key Challenges Bandwidth Efficiency Beyond current DVB-RCS specs for addressing consumer broadband market Improved Rain fade mitigation Multi-Beam Ka Band Footprint Example Very High-Capacity Hub Systems Forward Links to multiple Spot Beams Return Links from multiple Spot Beams Scalable Hub Management For large multi-hub networks Site Diversity for Hubs Robustness during bad weather Minimizing interference from low-orbit satellites 2
3 Simple Example with Four Spot Beams Therefore Hub Spot Must Have: 1600 MHz for Forward Uplinks 600 MHz for Return Downlinks Assume Each Spot Gets: 400 MHz for Forward Downlinks 150 MHz for Return Uplinks DVB-S2 Forward uplinks DVB-RCS Return Downlink DVB-S2 Forward Downlinks DVB-RCS Return Uplink The Hub Spot Internet Hub has 32 Forward Links (8 per spot) 600 Return Links (150 per spot) Assumes Bandwidth of: 50 MHz for each Forward Link Carrier 1 MHz for each Return Link Carrier 3
4 Key Enabling Technologies for Bandwidth Efficient, High-Capacity Hubs High Performance DVB-S2 Forward Links with ACM Modulation from QPSK to 16APSK: FEC from1/4 to 9/10 IP Forwarding up to ~100 Mbps (if antennas are ~ 0.66m) On-the-fly determination of MODCOD for each FEC frame for max flexibility Dynamic intermixing of Short and Normal FEC Frames for max fill rates Advanced ACM capabilities on next generation DVB-RCS Return Links: Modulation QPSK to 16QAM: FEC from 1/4 to 9/10 Dynamic MODCOD on TDMA Bursts for any return link Wide-Band, High-Capacity Return Link Systems (RLSs) Reception of up to 32 Return Links by each RLS Concurrent reception of 32 ACM Bursts anywhere within 40 MHz band Enables matching of one RLS to each Forward Link Scalable Hub Architecture Modularised Hub design Robust and scalable NMS and database technology 4
5 Fully Integrated, Compact RLS & FLS Equipment Forward Link System (FLS) implements: Traffic Shaper, IP Encapsulation & Forwarding, NCR Generator, SI Table Inserter, DVB-S2 modulator with ACM, Up-converter Return Link System (RLS) implements: Down-converter, 32x Burst Demodulator w/ ACM per burst, Packet Reassembly, IP Routing on Hub LAN Very flexible Software-Radio architecture Simplifies redundant, high-availability hub configurations using 1:1, N:1 and N:M redundancy options FLS: 1 Rack Unit RLS: 1 Rack Unit 5
6 for Continuous Hub Scalability To Hub Sub-group Router (IP Traffic LAN or VLAN) Traffic Shaper IP Tx Network Accelerator & Firewall FLS (Forward Link System) NCC Tx IF To Hub Sub-group NMS (Management LAN or VLAN) IP Rx RLS (Return Link System) Rx IF FLS, RLS, NCC, and Network Accelerator Link Capacity: 1 Forward Link, Up to 32 Return Links VSATs supported: 2500 to 5000 Throughput: ~120 Mbps of IP outbound; ~50 Mbps of IP inbound NCC and Network Accelerator are based on industry standard, high-performance computing platforms 6
7 Hub Sub-Group Distributed NMS and Database I/O To Hub Router (IP Traffic LAN or VLAN) To common database (Management LAN or VLAN) NMS NMS Database Database Server Server 1:1 redundant IP Router NMS NMS Management Management Server Server Tx/Rx IF (FLS+RLS+NCC +NetAcc) Failure of any hub module does not affect others 5 to 10 hub modules N:1 redundant NMS Servers are based on industry standard, high-performance computing platforms 7
8 Scaling-up for Multiple Spots for Huge Total Hub Capacity Oracle Database REF (GPS + Time Server) Internet Firewall IP IP Router Router & Traffic shaper Hub Sub-Group (5-10 modules) Tx/Rx IF RF RF N hub sub-groups Automatic Distributed Database Synchronization Scalable to: 100 s of modules >10 Gpbs of IP throughput > s VSATs 8
9 Hub Site Diversity Duplicate antenna and RF configuration Fiber links between sites Automatic and manual switchover Seamless switchover Option for third Hub in same spot Hub #1 Hub #2 The Hub Spot 9
10 Conclusions High-bandwidth multi-beam Ka Band satellites pose new challenges in scalability, bandwidth efficiency, redundancy and management STM has addressed these challenges through: High-Performance Forward and Return Link Systems Scalable Hub architecture Robust an scalable NMS and database arcitecture built on the Oracle platform Flexible configuration options for desired redundancy Support for Hub site diversity 10
11 Networks Without Barriers Thank You STM Group, Inc. 2 Faraday Irvine, CA, USA STM Norway AS Vollsveien 21 N-1366 Lysaker, Norway
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