supply of procurement of 50 pair x 0.5mm ,10 pair x 0.63 mm and 20 pair x 0.63.procurement of 50 pair x 0.5mm ,10 pair x 0.63 mm and 20 pair x 0.63.,polythene insulated polythene sheathed armoured jelly filled telephone cable with poly-al mo isture barrier 0.63 mm dia 10 pair to specification no. irs:tc:41-97 with latest amendment. [ warranty p eriod: 30 months after the date of delivery ] ] , supply of underground pijf cable 50 pair pvc insulated 0.5 mm.dia.copper conductor inner s heathed double steel tape armoured as per rdso specn no.irs tc/41/97 with amendmen 2 or latest. [ wa rranty period: 30 months after the date of delivery ] ] , supply of 20 pair pijf cable 0.63 mm dia underground armoured polythene insulated sheathe d jelly field telecom cable with poly a1 moisture barrier as per rdso specn - irs/tc/41-97 with amendmen t no.1,2,3 or latest. [ warranty period: 30 months after the date of delivery ] ]