supply of back plane and supply, installation and commissioning of automatic media change over systemback plane and supply, installation and commissioning of automatic media change over system,back plane suitable and compatible with existing webfil make universal fail safe block interf ace (ufsbi) equipment of ranchi division as per rdso spn. no. 105/2012 (ver 0) or latest. [ warranty per iod: 30 months after the date of delivery ] ] , supply, installation and commissioning of automatic media change over system with built-in modem for working on redundant channels of ofc and 6 quad for data transmission and seamless operatio n of ufsbi over multiple media, suitable and compatible with existing webfil make universal fail safe block interface (ufsbi) equipment of ranchi division as per rdso spn. no. 105/2012 (ver 0) or latest. [ warrant y period: 30 months after the date of delivery ] ]