AfriConnect Satellite Technology Overview

Topics• Why VSAT?• Defining The Network Requirements

– Coverage– Traffic & Connectivity– Features Public & Private Networks

• Understanding The Technology– VSAT Terminal & IDU– Transmission Basics– Satellite Network

• What Fits The Application?

Why VSAT?• Geographic coverage: satellites cover the globe• Speed of implementation: terminal can be installed and

operating within a day• Flexible: supports voice, data, Internet and video• Modular: start small - end up big - pay for what you need• Reliable: VSAT networks operate at 99+% availability • Network management: control over the network,

common equipment at each site• Cost: capital and operating cost

Applications• Data transmission

– point-to-point, point-to-multipoint, broadcast– interconnection of LANs– coupling of computer centres– internet direct access to the backbone– e-mail connection– decentralised database access

• Voice and fax applications– interconnection of PBXs (ISDN E1 Interface)– public switched telephone and fax services– emergency backup communication facilities

• Desktop video/multimedia– video-conferencing– tele-education (distance learning, training)– tele-medicine

Coverage

Teleport Facility

Connectivity

Connectivity Choices

• Private Networks• Control of QoS, bandwidth, fixed costs

• Previously only way of getting higher bandwidths

• Public Networks• Shared features

• Best endeavours rather than guaranteed performance

Private Network• Closed VSAT network, no shared traffic

– Reduced security issues, internal network only– Guaranteed delivery time across network– Single satellite hops for voice possible

• Any configuration– Star, mesh, partial mesh, dynamic pooled bandwidth,

burstable bandwidth– Diverse routing & redundant systems

• Services– Voice (circuit switched and IP), async data, TCP/IP,

UDP, voice conferencing, multicast services, VPN

• Any bandwidth up to 100Mbps

Public Broadband IP Service• Two-way broadband satellite access

– data rates of 128 kbps and above• Bursts up to 2Mbits• Over-subscription of the satellite bandwidth

where return on operational expenditure is maximised. Satellite bandwidth being the highest recurring cost

• STAR network architecture – hub and spoke configuration, any terminal to terminal communications requires a double hop through the central hub

• Transports Internet Protocol (IP) and respective higher layer protocols & applications

Agenda• Why VSAT?• Defining The Network Requirements

– Coverage– Traffic & Connectivity– Features Public & Private Networks

• Understanding The Technology– VSAT Terminal & IDU– Transmission Basics– Satellite Network

• What Fits The Application?

VSAT Terminals• 0.9 - 3.7m VSAT• Any make or design• Outdoors

– Dish & mount– RF

• Indoors– Satellite modem– Terrestrial network

interface

Technologies & TLA’s• Carriers & Services

– SCPC (Turbo)– Frame– DAMA (SCPC FDMA & TDMA)– DVB-RCS, DVB-SCPC, TDMA

• Network Hardware– Voice, security, multimedia

Network Architecture Options

MeshHybridStar

Star Network: Point-to-point / SCPCCentral Site

Bandwidth on Satellite

F264kb/s

F364kb/s

F464kb/s

F564kb/s

F664kb/s

F764kb/s

F864kb/s

F964kb/s

F1064kb/s

F1164kb/s

F1264kb/s

F164kb/s

Total Bandwidth 768 kb/s

Six Remote Sites

F7

F8

F9

F10

F11

F12

CPE

F1

Satellite ModemF2

Satellite ModemF3

Satellite ModemF4

Satellite ModemF5

Satellite ModemF6

Satellite Modem

LAN

PBX

Satellite Modem

CPE

LAN

Satellite Modem

CPE

LAN

Satellite Modem

CPE

LAN

Satellite Modem

CPE

LAN

Satellite Modem

CPE

LAN

Satellite Modem

CPE

LAN

Satellite Modem

CPE

LAN

Satellite Modem

CPE

LAN

Satellite Modem

CPE

LAN

Satellite Modem

CPE

LAN

Star Network: Frame

Bandwidth on Satellite

Central Site

Six Remote Sites

F2

F3

Satellite Modem

SDM-9350

F4

F5

F6

F7

Mod/Demod(1-2)Demod (3-6)

F1192kb/s

F264kb/s

F364kb/s

F464kb/s

F564kb/s

F664kb/s

F764kb/s

Total Bandwidth 576 kb/s

F1

SDM-9380

LAN

Satellite Modem

SDM-9350

LANSatellite Modem

SDM-9350

LAN

Satellite Modem

SDM-9350

LANSatellite Modem

SDM-9350

LAN

Satellite Modem

SDM-9350

LANSatellite Modem

SDM-9350

LAN

Satellite Modem

SDM-9350

LANSatellite Modem

SDM-9350

LAN

Satellite Modem

SDM-9350

LANSatellite Modem

SDM-9350

LAN

LAN

PBX

DAMA “A Switch in the Sky”

Dynamic Bandwidth Allocation

REMOTE 1

REMOTE 4

REMOTE 6

1024Kbps

1024Kbps

REMOTE 2

REMOTE 5

REMOTE 3

Dynamic Bandwidth Allocation

REMOTE 1

REMOTE 6

REMOTE 2

REMOTE 5

REMOTE 3

REMOTE 4

Dynamic Bandwidth Allocation

REMOTE 4

512Kbps1024Kbps

512Kbps

REMOTE 1

REMOTE 6

REMOTE 2

REMOTE 5

REMOTE 3

Agenda• Why VSAT?• Defining The Network Requirements

– Coverage– Traffic & Connectivity– Features Public & Private Networks

• Understanding The Technology– VSAT Terminal & IDU– Transmission Basics– Satellite Network

• What Fits The Application?

Decision Process

• Budget• Capex vs. Opex

• Client requirements• Locations• Connectivity needs• Volume• Skill sets! Trade-Offs

• Duration

AfriConnect Recommended Standard Solutions• Ku-band & C-band solutions• 1.2 - 2.4m antennas• 32Kbps - 2Mbps• Choice of service depends on application and

location– SatIP– SatWidth

Broadband IP- VSAT Technology

Router

Internet/ Backbone

Network Operator Teleport Network Operator Teleport

LAN Switch

VoIP Phone

Remote Client Site Remote Client Site

Broadband VSAT Hub

Downstream Data Flow

C or Ku BandFrequencies

11.5 Mbps TDM Shared Downstream with

Turbo Coding

Hub

Customer BCustomer BLAN DataLAN Data

Customer ACustomer ALAN DataLAN Data

Data From Data From SourceSource

Upstream Data Flow

Configurable TDMAupstream (5.5Mbps)

with Turbo coding

Customer BCustomer BLAN DataLAN Data

Hub

C or Ku BandFrequencies

Customer ACustomer ALAN DataLAN Data

To To DestinationDestination

Option 1 - SatIP• 1.2 - 1.8m Ku-band VSAT• PAS 10 satellite• DVB / TDMA• SatIP-POD18 IDU provides an

“always-on” connection for instant access to the Internet and corporate Intranet– embedded TCP/IP acceleration – 10BaseT Ethernet connection

suitable for one PC, or connected to a router or hub or switch on a LAN

• Each PC on the network must have anti-virus and firewall software installed to prevent problems

Options 2 - SatWidth• 1.8 - 2.4m C-band VSAT• AB3 satellite• TDMA / TDMA• Turbo Product Code, TCP Acceleration,

encryption• 10BaseT • Each PC on the network must have anti-

virus and firewall software installed to prevent problems

So, Why VSAT?! Broadband VSAT offers

“organisational level” connectivity solutions and bandwidths

! Or flexible connectivity if telecoms not centralised function

! Many of the variables and pricing have now been simplified

! More complex networks can be engineered

! Higher bandwidths at lower cost available on demand

! High level business applications can be supported

AfriConnect Satellite Technology Overview