WEEK 2 : DAY 4 PASENGER RESERVATION SYSTEM

2.4 PASSENGER RESERVATION SYSTEM ( PRS )

2.4.1 Introduction

       My friend wish to go to Mumbai for a trip. He opened the IRCTC website and booked the ticket. So convenient isn't it. But this system itself requires sophisticated techniques to perform. We will just touch the basics of what we say "PASSENGER RESERVATION SYSTEM".

       "Passenger reservation system in layman terms can be defined as a system through which a passenger is given reservation in all trains in all major authorised platforms around the country for any journey."

       PRS is the complete solution to provide computerized reserved tickets to railway passengers from dedicated terminals. It is a huge challenge is to provide a reservation system that can support such a huge scale of operations.

2.4.2 Main frame servers of PRS

       Five (5) Main Frame Servers are located at :-

• New Delhi 
• Kolkata 
• Mumbai 
• Chennai 
• Secundrabad

2.4.3 Salient features of PRS

• It uses Dumb Terminal technology.
• All of the five sites have been inter-networked using routers, on leased communication line connections from Railtel (RCIL) and Department of Telecom (DOT).
• PRS network of the Indian Railways will enable reservations in any train, date, or class, between any pair of stations to the travelling public on about 2000 terminals across the country.
• The PRS uses the software called (CONCERT) COUNTRY-WIDE NETWORK FOR COMPUTERIZED ENHANCED RESERVATION AND TICKETING developed by CRIS, Chanakya Puri, New Delhi, is a total networking.
• solution to Indian Railways Passenger Reservation System.
• The entire CONCERT application had been hosted on 5 VAX-VMS clusters located at the five PRS sites.

2.4.4 Typical Arrangement of PRS terminals

TYPICAL ARRANGEMENT OF PRS TERMINALS

• Case 1  :Client Terminals are derived from the output of Terminal servers and can operate up to a distance of 50 feet.

• Case 2:If the Distance is greater than 50 feet line drivers are used to extend the connectivity up to 3 Kms.

• Case 3: For extending multiple number of client terminals, the asynchronous output of Terminal server are multiplexed through STATMUX. The composite output signal is driven through leased lines for remote locations.

• Case 4: For Extending multiple number of Composite output of Stat Muxes to a major location or a hub location, the composite output derived are compressed using Data compression Multiplexer (DCM) (up to 8 composite inputs) and driven through leased lines. DCMs are provided with a Primary compressed output to transfer over high speed data links (2 Mbps) and a redundant secondary port to drive over low speed network (64 Kbps) during primary path failure. 

    That's ends for today have a nice and "reserved" day. HE HE HE!!!!

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