Temasek Engineering School
Satellite-Internet Competency Unit
Presented by
KK Kwong on behalf of John Leong
Satellite-Internet WG
APAN Technology Area
Agenda
 SG-MY
link and project trials
 SG-JP AI3
link
 Proposal
to include HKPolyU in
Satellite network
 Test
results in projects:

- TCP/IP over Satellite

- Hybrid Asymmetric link
 New
project proposal from members
SG-MY Satellite Link
This Multipoint-to-Multipoint Video Conferencing System uses IGMP
multicasting for efficient transmission of real-time multimedia data.
Multicasting greatly reduces multimedia traffic compared to
conventional unicast traffic, thus improving bandwidth utilization.
Project Partner:
•Universiti Sains Malaysia (USM)
•MeaSAT provides free 2 Mbps
satellite bandwidth
MCS: Multimedia Conferencing System
Mlabs: Multimedia Research Lab
Mlabs MCS
server
Mlabs MCS
server
TP Modem
USM Modem
Mlabs MCS
client
Mlabs MCS
client
TP Router
USM Router
SG-JP Link
 Joined
the AI3 network in Dec 99 with a 1.5 Mbps
link via JCSAT-3
 Link
from Temasek Polytechnic to Keio
University, SFC campus established
 Layer
2 router test successful
SG-JP Link
TCP/IP protocol is designed to work with terrestrial copper or fibreoptic transmission medium. Its performance degrades over satellite
link due to the inherent propagation delay over satellites. The setup
below will study the performance issues faced by TCP/IP protocol
over satellite link, and enable tests to be conducted to verify
improvements in modified TCP/IP protocol over satellite link
Project Partners:
• Keio University, Japan
• NTU/NTRC & NUS/CIR, S’pore
Internet
Gateway
VSAT IDU
IDU : Indoor Unit
ODU : Outdoor Unit
VSAT ODU
VSAT ODU
VSAT IDU
Internet
Gateway
AI3 Project: Web Caching
Caching is a technique used to improve the performance of internet
access by buffering the recently accessed web objects for future
access. In the Asia Internet Interconnection Initiatives (AI3)
grouping, a web cache bone is conceived to control and more
efficiently utilize the satellite bandwidth consumption by web traffic.
Internet
Rim Cache
Internet
Gateway
Hub
Cache
Project Partners : CyberWay
AIT, Thailand
Keio University, Japan
Rim Cache
Rim Cache
AI3 Project: Multicast Internet Traffic over Satellite
The advantage that Satellite transmission media has over
cable or point-to-point terrestrial link is its ability to
broadcast. Multicast or group addressing ensures that
registered members of a group receive the Internet traffic with
the same transmission, thus saving bandwidth
Technology:
DVMRP, PIM, Multicast Tunnel
Applications:
Video Conferencing, Video
Streaming, Distance Learning,
Web Caching
Collaboration:
Universiti Sains Malaysia
ITB, Indonesia
AI3 Project: Internet Protocol Version 6
Internet Protocol version 6 (IPv6) looks set to be the successor
to the current version of Internet Protocol, ie IPv4.
IPv6 offers numerous benefits including 128-bit addressing
(compared to IPv4’s 32-bit), auto address configuration, and
elaborate security features (IPSec)
Temasek Polytechnic
Singapore
IPv6
NAIST,Japan
IPv6/
IPv4
IPv6/
IPv4
Router
Router
IPv4-tunnelled IPv6 configuration
IPv6
Proposal to include Hong Kong Polytechnic
University in Satellite Network
Project Partner:
• Hong Kong Polytechnic University
• Temasek Polytechnic
• Required 2 Mbps satellite bandwidth
RESONATE
Client
RESONATE
Server
WebCast
Server
VRCIM
Client
VRCIM
Server
TP Modem
HKPU Modem
GDM Server
GDM Client
TP Router
HKPU Router
Project Results – TCP/IP Over Satellite
Setup of Project
MeaSat 2
Satellite
Dish
Test
File
Satellite
Dish
Modem
Modem
Router
Router
Hub
Switch
Slave PC (1)
Master PC
Acknowledgement
Command
File
Slave PC (2)
Project Results – TCP/IP Over Satellite
Results

RX Packets vs Delivery Time
Project Result – Hybrid Asymmetric Link
Asymmetric SatelliteTerrestrial Network
User Network
Conventional Network
Router
Masquerading
Host
Router
Hybrid
Gateway Server
Internet
Application Server
Future
 New
Proposal for projects