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L-3 DSPT

The document describes the Digital Satellite Phone Terminal (DSPT) system used by BSNL in India. The DSPT system uses VSAT technology to provide telephone connectivity to rural and remote areas via satellite. It consists of a hub station and 15,000 remote terminals located across several states. The hub station is located in Sikanderabad, AP, Delhi, and UP and includes indoor facilities like a baseband unit and transit switch, as well as outdoor facilities like an 8.1 meter antenna and RF transmit and receive chains. The system provides PSTN connectivity via INSAT or leased satellite transponders using DAMA technology in a star network topology.

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368 views4 pages

L-3 DSPT

The document describes the Digital Satellite Phone Terminal (DSPT) system used by BSNL in India. The DSPT system uses VSAT technology to provide telephone connectivity to rural and remote areas via satellite. It consists of a hub station and 15,000 remote terminals located across several states. The hub station is located in Sikanderabad, AP, Delhi, and UP and includes indoor facilities like a baseband unit and transit switch, as well as outdoor facilities like an 8.1 meter antenna and RF transmit and receive chains. The system provides PSTN connectivity via INSAT or leased satellite transponders using DAMA technology in a star network topology.

Uploaded by

Anitha Anu
Copyright
© Attribution Non-Commercial (BY-NC)
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as DOC, PDF, TXT or read online on Scribd
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DSPT

L-3

DSPT

-----------------------------------------------------------------------------------------------BRBRAITT JABALPUR Issue/ March 07

DSPT

DIGITAL SATELLITE PHONE TERMINAL (DSPT)


Introduction: Digital Satellite Phone Terminal System (DSPT system or DSPS) project involves setting up a VSAT (Very Small Aperture Terminal) Based network for BSNL. The system consists of HUB Station and Remote Digital Satellite Phone Terminals working in Ku-Band (Transmit Frequency is 13.75-14.5 GHz and Receive is 10.7-12.75 GHz). DSPT Network provides PSTN connectivity to rural, remote, inaccessible and hilly areas via INSAT (Indian National Satellite) or leased transponder for DTS network. The VSAT system works in a star topology using DAMA (Demand Assigned Multiple Access) technology. For BSNL VSAT network the Hub shall be located at Sikanderabad (A.P.), adjoining Delhi, in Uttar-Pradesh and there shall be 15000 DSPT remotes located over several states in India with higher proportions being in North, North East and East provinces.

-----------------------------------------------------------------------------------------------BRBRAITT JABALPUR Issue/ March 07

DSPT Typical Network Configuration of DSPT system

Overview of DSPT HUB: -----------------------------------------------------------------------------------------------BRBRAITT JABALPUR Issue/ March 07

DSPT The Hub of DSPT system will be composed of Indoor and Outdoor facilities. The outdoor facility is a complete Antenna and RF path while the indoor comprises the Hub Base-band and the other equipments: The Hub of DSPT system comprises of Indoor facilities and Outdoor facilities. Indoor facilities: Indoor facilities has following components, a. Hub Base-band b. Transit switch. In the Indoor facility consists of redundant Hub-base band unit, a Transit switch to provide connectivity to PSTN network, associated Data-Base servers, Billing system consisting of Billing system Hardware and software, the data networking equipment consisting Firewall, web-server, Authentication server and router to provide backend connectivity to the Internet. The base-band and remotes have a NMS and its database to configure and manage the entire VSAT-based network. Outdoor facilities: a. Antenna (8.1 Meter antenna assembly): In the Outdoor facility has an Extended motion antenna assembly, which is controlled by 3-phase Elevation and Azimuth motors. The Antenna consists of a Cass-grain Feed Horn with Hyperbolic dish at focus of antenna. b. RF path: RF path consists of Transmit chain and Receive chain. Transmit chain consists of -ULPC (Up Link Power Control), - Up Converter and - SSPA (Solid State Power Amplifier) and Receive chain consists of - Trance reject filter, - Radar reject filter, - LNA (Low Noise Amplifier), - Power divider and Down converter.

-----------------------------------------------------------------------------------------------BRBRAITT JABALPUR Issue/ March 07

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