supply of cpu card, modem, key switch, etc...cpu card, modem, key switch, etc..., output card of universal fail safe block interface ( ufsbi ) equipments as per rdso spec. no.irs:s-105 / 2015 ver.0 of deltron make. [ warranty period: 30 months after the date of delivery ] , cpu card compatible with existing ufsbi system of deltron make. [ warranty period: 30 months after the date of delivery ] , modem ( e1-rs232 ) compatible with existing ufsbi system [ warranty period: 30 months after the date of delivery ] , block telephone ( complete with ptt handset ) suitable to work with block panel & ufsbi of deltron make [ warranty period: 30 months after the date of delivery ] , mushroom head push button swithch with 1 no+1nc or 2no config. of esbee make suitable to work with block panel. ( deltron ) [ warranty period: 30 months after the date of delivery ] , key switch with 1 no+1nc or 2 no config. of esbee make suitable to work with block panel. ( deltron ) [ warranty period: 30 months after the date of delivery ] , key switch with 1 no+1 nc or 2 no config. of siemens make, suitable to work with block panel. ( deltron ) [ warranty period: 30 months after the date of delivery ]