supply of dual redundant arrangement of ufsbi electronics for exchange of vital relay state exchange pertaining to ib signaling, etc. the system comprises of following sub systems. a ) supply of electronics for ufsbi interface as per irs specification no irs-s104 / 2012 ver. 0 ( latest amendment ) . equipment should be equipped to work on both ofc and quad along with auto changeover modem. spares also to be supplied as per the enclosed annexure a.webfil make [ warranty period: 30 months after the date of delivery ] , installation and commissioning of dual redundant arrangement of ufsbi. [ warranty period: 30 months after the date of delivery ]