supply of supply of block proving by digital axle countersupply of block proving by digital axle counter, supply of block proving by digital axle counter using ufsbi for single line operation as per irs specification no. irs: s-105 / 2012 ( ver.0 ) or latest amendment. this consist of universal fail safe block interface ( ufsbi ) & block panel for single line operation as per detail below; i ) universal fail-safe block interface ( ufsbi ) as per rdso spcn. no. rdso / spn / 147 / 2005 or latest amendment ii ) sm panel rdso drg. no. rdso / s / 32019 ( tentative ) . iii ) relay rack with due locking and sealing arrangement as per rdso drg. no. rdso / s / 32020 including relays for each relay rack ( qn1-22 nos, qna-06 nos, ql1-02 nos. & timer -1 no. ) qty-02 nos. information by purchaser ( as per para 15.0 of irs spn no.irs:s-105 / 2012ver.0 ) 1 requirement- for single line block 2 communication media from station to station - ofc & quad both 4 any other information, as deemed fit- nil sse / re / sig / lko ( anil uttar pradesh 1.00 pair => limited