corrigendum - supply installation testing and commissioning of hardware andsoftware for real time data acquisition system in 125 sub stations of ksebl within ipds towns of kerala state , rt-das at data centre : hardware , rt-das server , fep server with interface switches , isr server , developmental server with console , workstation with dual tft monitors , layer ii switch , gps time synchronization system , any other item to meet specification requirements , rt-das at data centre : software , rt-das software , isr software , any other item to meet specification requirements , frtu , frtu comprising panels , racks , sub-racks , redundant power supply modules , cpu , analog / digital input ( as per requirement ) / digital output ( minimum 24 do ) modules , communication ports etc . as per specification , interfacing equipment , required converters & all other required items / accessories including complete wiring for all modules for locations mentioned , mfts ( feeder , incomer , bus coupler ) ( actual qty to be surveyed ) , cmrs ( actual qty to be surveyed ) , 4g modem ( shall support gprs / 2g / 3g also ) , any other item to meet functional / performance requirement of mts requirements , test equipments for frtu - frtu database configuration & maintenance software tool & master station cum rtu simulator & protocol analyser software tool &laptop pc for above software tools along with interfacing hardware , free standing dc power supply ( dcps ) system based on smps rated for minimum 15a ( installation as per ksebl direction in identified 25 locations ) along with battery bank ( vrla type ) - minimum 100 ah , operations & maintenance , annual maintenance charge , 5% spare equipments for satisfactory functioning