Networks Without Barriers

www.stmi.com

High Performance Ka-Band

Networks

STM Norway AS

June, 2008

2

Multi-Beam Ka Band Networks

Key Challenges

• Bandwidth Efficiency� Beyond current DVB-RCS specs

for addressing consumer broadband market

� Improved Rain fade mitigation

• 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

Multi-Beam Ka Band

Footprint Example

3

Simple Example with Four Spot Beams

DVB-S2Forward upLinks

Internet

Assume Each Spot Gets:

• 400 MHz for Forward Downlinks

• 150 MHz for Return Uplinks

Therefore Hub Spot Must Have:

• 1600 MHz for Forward Uplinks

• 600 MHz for Return Downlinks

The Hub Spot

DVB-S2Forward

Downlinks

Assumes Bandwidth of:• 50 MHz for each Forward Link Carrier• 1 MHz for each Return Link Carrier

Hub has• 32 Forward Links (8 per spot)• 600 Return Links (150 per spot)

DVB-RCS

Return

Uplink

DVB-RCS

Return

Downlink

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

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

6

Hub Module

for Continuous Hub Scalability

NCC and Network Accelerator are based on industry standard, high-performance computing platforms

FLS(Forward Link System)

FLS(Forward Link System)

RLS(Return Link System)

RLS(Return Link System)

NCCNCCNetwork

Accelerator& Firewall

NetworkAccelerator& Firewall

TrafficShaper

TrafficShaper

Tx IF

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

To Hub Sub-group NMS

(Management LAN or VLAN)

IP Tx

IP Rx

To Hub Sub-group Router

(IP Traffic LAN or VLAN)

NMSManagement

Server

NMSManagement

Server

NMSDatabase

Server

NMSDatabase

Server

7

Hub Sub-Group

Distributed NMS and Database I/O

NMS Servers are based on industry standard, high-performance computing platforms

Hub ModuleHub Module

Hub ModuleHub ModuleHub ModuleHub ModuleHub ModuleHub ModuleHub ModuleHub Module

NMSManagement

Server

NMSManagement

Server

NMSDatabase

Server

NMSDatabase

Server

IP RouterIP Router

Hub Module(FLS+RLS+NCC

+NetAcc)

Hub Module(FLS+RLS+NCC

+NetAcc)

To common database

(Management LAN or VLAN)

To Hub Router

(IP Traffic LAN or VLAN)

Failure of any hub module does not affect others

5 to 10 hub modulesN:1 redundant

1:1 redundant

Tx/Rx IF

8

Scaling-up for Multiple Spots

for Huge Total Hub Capacity

Automatic Distributed Database Synchronization

Hub ModuleHub Module

Hub ModuleHub ModuleHub ModuleHub ModuleHub ModuleHub ModuleHub ModuleHub Module

IP RouterIP Router

Hub Sub-Group(5-10 modules)

Hub Sub-Group(5-10 modules)

N hub sub-groups

IP Router &Trafficshaper

IP Router &Trafficshaper

Scalable to:

• 100’s of modules

• >10 Gpbs of IP throughput

• >100000’s VSATs

FirewallFirewallInternet

Oracle Database

REF(GPS + Time Server)

REF(GPS + Time Server)

RF RF RF RF

Tx/Rx IF

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 spotThe Hub Spot

Hub #1 Hub #2

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

Networks Without Barriers

www.stmi.com

Thank You

STM Group, Inc. | 2 Faraday | Irvine, CA, 92618 USA

STM Norway AS | Vollsveien 21 | N-1366 Lysaker, Norway