PNGARNet

Satellite Communication for Universities and Research Institutes: A New Design

Peggy Kegana

DWU - PNGUpdate – 15th April 2008

PNGARNet

Implementation - 2008

DWU IT Services

Very Small Aperture Terminal (VSAT)

3 M Vanuatu

Satellite in Geostationary Orbit – 38586 km

Geostationary Orbits

• The speed and height of these satellites allow them to remain synchronised above a specific location on the earth at all times.

• Time delays of about 0.5 sec are experienced in back and forth transmissions which can be a problem for time-critical applications

Transponder

• Receiver tuned to uplink band• Frequency shifter to change

frequency to downlink band• Power amplifier• Electric power from solar cells on flat

panels

ASIASAT 4 – Footprint (Area covered by downlink)

Ground Station, Satellite, Hub

Typical Client Side

Main Hub – Speedcast - Hong Kong

Internet Connection

Speedcast / ASIASat NOC & Teleport

Hong Kong Teleport

Hong Kong as a central convergent point for the Internet

Convergence of submarine cables – see next slide

Only 2/3 hops to US and UK improving access to WWW

Oceanic Broadband Solutions to serve as ISP for PNGARNet

Colocated Server Farm at Hong Kong Hub (NOC or Data Centre) Remote administration from DWU IT

Services Hardware maintained on-site Hardware Redundancy Clustering used to provide Load

Balancing and Fault Tolerance

Internet Access from Hong Kong– Optical Fibre Submarine Cables

Server side

Colocated Server Farm at Hong Kong Hub

NOC / Data Centre

Equipment Racks

NOC / Data Centre