supply of ssbpac ( digital ) for single line as per rdso specification no. rdso / spn / 175 / 2005 ver. 1 or latest along with station master block panel along with dtmf based electronic block bell & block telephone equipment as per specification no rdso / spn / 191 / 2005 ( ver. 0 ) or latest, microprocessor lighting & surge protection devices for power line 24 dc class-c, lighting & surge protection devices for data line class-d, ekt for shunt key as per drg. no. sa-22601 / alt.4 & irs: s-21 / 2001 and associated data cable including wired relay rack without relays. ( required relays for this item will be supplied by railways ) . , supply of ssbpac ( digital ) for single line as per rdso specification no. rdso / spn / 175 / 2005 ver. 1 or latest along with station master block panel along with dtmf based electronic block bell & block telephone equipment as per specification no rdso / spn / 191 / 2005 ( ver. 0 ) or latest, microprocessor lighting & surge protection devices for power line 24 dc class-c, lighting & surge protection devices for data line class-d, ekt for shunt key as per drg. no. sa-22601 / alt.4 & irs: s-21 / 2001 and associated data cable including wired relay rack without relays. ( required relays for this item will be supplied by railways ) . , supply of ssbpac ( digital ) for single line as per rdso specification no. rdso / spn / 175 / 2005 ver. 1 or latest along with station master block panel along with dtmf based electronic block bell & block telephone equipment as per specification no rdso / spn / 191 / 2005 ( ver. 0 ) or latest, microprocessor lighting & surge protection devices for power line 24 dc class-c, lighting & surge protection devices for data line class-d, ekt for shunt key as per drg. no. sa-22601 / alt.4 & irs: s-21 / 2001 and associated data cable including wired relay rack without relays. ( required relays for this item will be supplied by railways ) . , supply of ssbpac ( digital ) for double line as per rdso specification no. rdso / spn / 175 / 2005 ver. 1 or latest along with station master block panel along with dtmf based electronic block bell & block telephone equipment as per specification no rdso / spn / 191 / 2005 ( ver. 0 ) or latest, microprocessor lighting & surge protection devices for power line 24 dc class-c, lighting & surge protection devices for data line class-d, ekt for shunt key as per drg. no. sa-22601 / alt.4 & irs: s-21 / 2001and associated data cable including wired relay rack without relays. ( required relays for this item will be supplied by railways ) , supply of ssbpac ( digital ) for single line as per rdso specification no. rdso / spn / 175 / 2005 ver. 1 or latest along with station master block panel along with dtmf based electronic block bell & block telephone equipment as per specification no rdso / spn / 191 / 2005 ( ver. 0 ) or latest, microprocessor lighting & surge protection devices for power line 24 dc class-c, lighting & surge protection devices for data line class-d, ekt for shunt key as per drg. no. sa-22601 / alt.4 & irs: s-21 / 2001 and associated data cable including wired relay rack without relays ( required relays for this item will be supplied by railways ) .. , supply of ssbpac ( digital ) for single line as per rdso specification no. rdso / spn / 175 / 2005 ver. 1 or latest along with station master block panel along with dtmf based electronic block bell & block telephone equipment as per specification no rdso / spn / 191 / 2005 ( ver. 0 ) or latest, microprocessor lighting & surge protection devices for power line 24 dc class-c, lighting & surge protection devices for data line class-d, ekt for shunt key as per drg. no. sa-22601 / alt.4 & irs: s-21 / 2001 and associated data cable including wired relay rack without relays ( required relays for this item will be supplied by railways ) ..