repair maintenance of electrical and mechanical services at old sectt . , 2-rmo electrical and mechanical services at directorate of information and publicity at old sectt . , new delhi . sh- comprehensive maintenance of digital key telephone system of hindustan make , comprehensive maintenance of 64 port kts digital exchange of hindustan make having fallowing features:- a ) 4 kts lines b ) 12 trunk lines c ) 48 analog extensions , comprehensive maintenance of epabx ( electronic private automatiic branch exchange ) ( 4+16 ) of hindustan make and all the instruments attached to with all the features of standard exchange i / c replacement of all spears except body and wiring as reqd . ( make hindustan ) 2no , comprehensive maintenance kts instrument set suitable for above system ( 2 no ) , comprehensive maintenance telephone instrument set suitable for item no 1 ( 40 no ) , comprehensive maintenance plan 101 set having all the features of suitable plan system as reqd ( 10 no ) , comprehensive maintenance of networking system installed in the office having 2 no racks fitted with switches and router of cisco make as reqd