Upload
tirupati100
View
229
Download
0
Embed Size (px)
Citation preview
7/29/2019 Satcom intro and future
1/22
DEVELOPMENT IN SATELLITE COMMUNICATION ANDBROADBAND INTERNET
By
Guru Hariharan
Chief Executive
BSES TELECOM LTD
7/29/2019 Satcom intro and future
2/22
The number of Internet Subscribers in India is likely to double to 7.9
million by the end of the year, making it the fastest growing market
in Asia,India had two million Internet users at the end of 2000, more thantriple the total a year earlier.
The current six million frequent Internet Subscribers in India will increaseto a staggering 40 million by the year-end 2005. Gartner projects thenumber of real Internet Subscribers to reach 7.9 million by year-end 2001
Current Internet Market Scenario
Highlights of New Telecom Policy
Category 'A' - whole of India
Category 'B' - 20 telecom circles: Delhi, Mumbai, Calcutta, Chennai, Ahmedabad, Bangalore,
Hyderabad and Pune.
Category 'C' - secondary switching areas of DoT.
A company can get any number of licenses.There shall be no limit on number of licenses that can be granted to a company in a particular
area.
International connectivity would be through gateways of DoT, VSNL or authorized public/
government organizations. Private ISPs will be allowed to provide gateways only after obtaining
security clearance. Direct interconnectivity between two separately licensed ISPs shall be
permitted.
ISPs will be free to fix their own tariff. However, TRAI may review tariffs at any time.Telephony on the Internet is not permitted.
7/29/2019 Satcom intro and future
3/22
Why need satellite and fiber backbone ?
Existing Monopoly Of VSNL
VSNL is India's monopoly carrier of international telecom traffic.
services include telephony, telex and telegraph.
Also provides a host of value-added services. gateway packet data transmission, electronic
data interchange Internet, International Maritime Satellite (Inmarsat) mobile services,
satellite uplinking, private leased channels, video conferencing etc.
It is at present the monopoly gateway access provider for international data transmission
and Internet.
VSNL's monopoly on the international gateways has been removed with private parties
setting up Internet gateways.
Submarine Cable NetworkThe submarine gateway opens up a new
revolution in the Field of IT technology having
a terra byte Capacity with 100% commitment
for faster communication.
Major Submarine Cable Network Players InIndiaFLAG TELECOM
SEA-ME-WE 3
DISHNET
I 2 I NETWORKS
7/29/2019 Satcom intro and future
4/22
Why Satellite ?
Satellite can fill in pockets where other technologies cant reach.
Global coverage.
Broadcast applications such as the delivery of the same
information to a large group of users.
High speed reliability.
Less packet loss.
Supporting DVB platforms for broadband applications.
Communication at terrestial links
7/29/2019 Satcom intro and future
5/22
Role of Satellites in Telecom Industry
Web browsing
WWW browsing, FTP access, and also electronic mail. High end users, Telecommuters and Small Office/Home
Office users desire high bandwidth access, which cannot be satisfied by common technologies
Information dissemination and broad-/mulitcastSatellite networks are better media to deliver bulk data, anywhere and anytime. Some illustrative examples include
maps and situation awareness data, stock market and financial numbers, battlefield information, and medical data.
Data broadcast, such as Webcasting, network news, and TV programs can be very expensive for point-to-point
networks, but is ideally suited to broadcast satellites. Therefore, GEO satellites are far more suitable for these
applications than is the traditional terrestrial network
Videoconferencing
Video conferencing applications use data compression to allow two-way multi-user video conferencing
connections to work over limited bandwidth channels. The PSTN infrastructure of today limits the video
conferencing to one-on one, point-to-point sessions. Networks with downstream bandwidth rates as the
Satellite based networks can provide the required capabilities for multi user simultaneous sessions where the
downstream data combines several sites participating in the conference.
Corporate ApplicationsA major application for businesses is the extension of their Intranet or corporate network to all of their
subsidiaries. With satellite, all subsidiaries in the spot beam of the satellite have instant access to the
database at their headquarters.
Some typical examples are :-
News agencies for distribution of high resolution images,
7/29/2019 Satcom intro and future
6/22
Distance Learning
Access to remote site containing educational oriented data as electronic library, lectures etc. can be achieved by
students anywhere in the Satellite coverage area. The content can be transmitted via the high-speed satellite
channel either individually to each student or simultaneously to sub groups on a multicast like system
Internet Service Providers
ISPs are companies that provide a range of IP based services including Internet access and related connectivity,
web hosting, data warehousing and targeted information services. ISPs can effectively use satellite communication
to provide fast Internet access to subscribers or businesses, which are out of reach of DSL or cable modem
providers. One of the services taking advantage of the satellites broadcast nature is Webcasting, where Video or
Audio signals such as news, interviews, or reports are broadcast over the Internet.
7/29/2019 Satcom intro and future
7/22
Types of Band
C-Band The frequency range between 3700 MHz to 4200
Ext C-Band The frequency range between 4.2 GHz to 6.8GHz Ext C-Band is an Improved
version of C-band
KuBand The frequency range from 10.7 GHz to 12.75 Ku-band requires smaller receiving
antenna thus has become the most popular method of broadcasting
Ka -Band The frequency range between 18 GHz to 24 GHz Ka Band operates on a very High
Frequency and is generally being used by Army and remote sensing organizations
Orbits
Typically Three known Orbits are existing Orbit type
Low Earth Orbit (LEO) Altitude 700 (km )------ GMPCS
Medium Earth Orbit (MEO)10,000(Km) ---------- GMPCS
Geostationary Earth Orbit (GEO)36,000 ( km ) --------- FSS / BSS
Satellites Needed For Global Coverage
LEO,s 40 + ( Iridium, Globalstar)
MEO,s 10 to 15 ( IcoGlobal )
GEO,s 3 to 4 (1) ( Intelsat Eutelsat ,Panamsat Thaicom and Newskies )
7/29/2019 Satcom intro and future
8/22
S
er
v
e
r
s
Satellites Connecting ISP network
Terrestia link
7/29/2019 Satcom intro and future
9/22
Major satellite with foot prints over India
Intelsat
Insat
Panamsat
Asiasat
Thaicom
Eutelsat
Singtel
Loral Cyberstar
Newskies
Top Five satellite system Operators as of year end 2000
Rank Operator Capacity
1 Intelsat 1,229
2 PanAmSat 846
3 GE American Comm 594
4 Eutelsat 498
5 New Skies 257
7/29/2019 Satcom intro and future
10/22
Benefits of using Satellite communication
Ease of Implementation
Availability
Reliability
Network Management
Recovery
Security
Scalability
Flexibility
Lower Cost
7/29/2019 Satcom intro and future
11/22
VSAT BASED CLOSE USER GROUP (CUG)
VSAT technology is appropriate for any organisation with
centralised management and data processing.
To minimise overall cost of the complete network
The shared hub :- Allows the use of low cost remote VSATterminals and optimises use of satellite capacity.
7/29/2019 Satcom intro and future
12/22
Three different transmission schemes are used for interactive
hubbed VSAT networks:
PAMA
TDMA DAMA(Demand Assigned SCPC)
Shared Hub NetworksTo make VSAT networks more affordable it is possible to share the hub
between several users, thereby spreading the cost. In this case the hub is
usually owned by a service provider who retains overall control of the networkand who manages the hub itself. Each user, however, is allocated his own time
slots or carriers and can so operate his own private network using the shared
hub facility without any loss of privacy.
7/29/2019 Satcom intro and future
13/22
Typical VSAT Network
7/29/2019 Satcom intro and future
14/22
Hub Station
The hub station is usually a relatively large, high
performance earth station with an antenna diameter ofanything between 6 and 9m. The hub consists of a
network control centre which manages the network as
well as IDE (Indoor electronics) ODE (antenna + front
end RFT,) for the transmission and reception of signals.
7/29/2019 Satcom intro and future
15/22
Interactive VSAT Networks
All the established interactive hubbed VSAT systems use
TDM/TDMA access as the primary access technique(having continous mode on outbounds and burst Mode
on inbounds).
7/29/2019 Satcom intro and future
16/22
The principle characteristics of an interactive VSAT
network are
Remote user sites have several low bit rate data terminal
equipments (DTEs) operating at 1.2 to 9.6 kb/s. These areconnected through the VSAT network to a centralised host
processor. The DTEs are connected to the host through
an X.25 Packet
The amount of data transferred in each transaction is
relatively small, typically between 300 and 105 bits
A large number of VSAT terminals (10 to 10000)
share the same communications link using random
access.
Connections between remote VSAT terminals require a
double hop through the hub and are rarely used.
7/29/2019 Satcom intro and future
17/22
The commercial geostationary communication satellite industry
1999 2000 2009*
No. of geostationary operators 43 46 50
No of satellites in operation** 212 233 240
No. of 36MHz equivalent transponders 5981 6531 12000
* forecast
** for all kind of services Digital Broadcasting Services ,Digital AudioBroadcasting ,Fixed Satellite Services and Mobile Satellite
Services .
7/29/2019 Satcom intro and future
18/22
Major corporates using Satellites
National Stock Exchange
Bombay Stock ExchangeDelhi Stock Exchange
OTCEA
Corporates
ONGC
BPCL
HPCL
Defence Agencies (Remote Sensing)
Banking Sector ATMs, Instant Money Transfer ,anywhere Banking etc.
Education Institutions :- NCERT,UGC IGNOU etc,
Cable Operators
Online Trading
7/29/2019 Satcom intro and future
19/22
VSAT/Satellite Service Providers
HCL ComnetHughes Telecom
Telstra V-Com
Bharti BT
Comsat Max
HFCL
ITI
Essel Shyam
7/29/2019 Satcom intro and future
20/22
SATELLITE AND FIBER COMMUNICATIONS
Satellite and fiber play complementary roles in international networks.Fiber offers network builders
practically unlimited bandwidth but limited geographic reach while satellites can provide limited
bandwidth but essentially limitless reach.
7/29/2019 Satcom intro and future
21/22
Conclusion :
Growth in the use of satellite systems have led to forecast that
global satellite capacity will grow in the next five years.This
expansion is linked to the growth of the Internet , which is
forecast to go from the current 320 million users doubling every
year .
7/29/2019 Satcom intro and future
22/22
Thank You