annual maintenance contract of computer hardware at different establishments across apdcl , hardware items : , server ( all make ) at field offices , x86 servers ( all make ) at data center , desktop ( all make ) , dot matrix printer ( all make ) , line printer ( all make ) , inkjet printer ( all make ) , laser printer ( all make ) , scanners ( all make ) , ups 5 kva online ( all make ) , ups 3 kva online ( all make ) , ups 2 kva online ( all make ) , ups 1 kva ( all make ) , ups 600 va ( all make ) , existing core switch port enhancement - data center ( all make ) , network switch ( unmanaged ) ( all make ) , network switch ( managed ) ( all make ) , routers ( all make ) , mpls router - data center ( all make ) , firewall with integrated ips - data center ( all make ) , bar code reader ( all make ) , external raid mass storage device ( all make ) , external dat drive ( all make ) , ups 20kva ( 1+1 ) ( all make ) , ups 10kva ( 1+1 ) ( all make ) , dcps 48v ( all make ) , dcps 24v ( all make ) , ip phones ( all make )