Jena Mine Vsat Presentation Ppt

8/12/2019 Jena Mine Vsat Presentation Ppt

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WHAT IS VSAT

Stands for Very Small

Aperture Terminal and

refers to receive/transmit

terminals installed atdispersed sites connecting

to a central hub via

satellite using small

diameter antenna dishes

(0.6 to 3.8 meter).@ C and KU BandFrequencies


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BROADCASTING ONLY

Stock market & other news

broadcasting

Training or continuingeducation from a distance

Distribute financial trends &

analyses

Introduce new products at

geographically dispersedlocations

Distribute video or TV

programs

Distribute music in stores &

public areas

Relay advertising to electronic

signs in retail stores

Transmit/Receive.....

Interactive computer

transactions

Internet

Video Teleconferencing

Bank transactions, ATM

Reservation systems

Distributed remote processcontrol and telemetry

Voice communications

Emergency services

Electronic fund transfer at

Point-of-Sale

Medical datatransfer

Sales monitoring & stock

control

VS

AT

S

ERVICES


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Equipments required for VSATnetwork

ANTENNAS

HIGH POWER AMPLIFIER

LOW NOISE AMPLIFIER

UP & DOWN CONVERTER

ECHO-CANCELLER

MODEMS

Power spliter POWER SYSTEM


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Satellite network TO link LANbetween offices


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Satellite-Terrestrial Networkingused to share the data from offices


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FDMA (Frequency Division Multiple Access )

TDMA (Time Division Multiple Access )

CDMA (Code Division Multiple Access )

Multiple Access


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Frequency Division Multiple Access

(FDMA)

An approach to sharing a channel byseparating the simultaneous users in

frequency

FDMA


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Frequency

PowerOutput

FDMA


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Time division multiple access (TDMA)

Approach for allotting single-channel

usage amongst many users, by dividingthe channel into slots of time during

which each user has access to the

medium.

TDMA


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TDMA/FDMA Combination

Frequency

PowerOutp

ut

FDMA

Each Channel inturn assigned to 8

subscribers on

TDMA mode

200 KHz


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TDMA

Tipical TDMA IN TRANSPONDAR


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Code Division Multiple Access (CDMA)

Spread spectrum technique using

high-speed pseudo random (PN) codesto scramble data words and spread

spectral occupancy for added

robustness.

CDMA


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The Signal Path


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Demand assigned multiple accesses (DAMA): In Demandassigned multiple accesses frequency allotted is controlledby Master Signaling Channel Unit (MSCU). Suppose if wewant to call any place then a request is send to MSCU.

MSCU allots frequency the frequency which is free. Then thecall is establish between that two places by using allottedfrequency. Once the call is complete is over, then thefrequency is left free so that it can be used again by othercaller. So now there can be many numbers of connections as

compared in PAMA. The satellite earth station where there isMSCU is called as masters station or HUB station.


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Main Components (cont)

Master site contains: Redundant call processing computers

An administration and maintenance terminal An antenna

A redundant RF subsystem

Master signaling channel units


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Features DAMA System features enhance

configurations and simplify network

operation. Features include: Universal telephone interface Digitized voice with Group III fax

Voice/data circuits can be added

Traffic analysis and billing data collection

Monitoring and control of remote stations Priority call handling

Redundant common equipment

Flexible, configurable channel units


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Typical 24 channel C-bandtransponder frequency plan

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Jena Mine Vsat Presentation Ppt