Tender For supply of ufsbi parts for redundancy hardware modem and media changeover : : - supply of modem rs232 to fiber compatible for existing ufsbi system , automatic media changeover for modem working on redundant channels for datatransmission on ofc quad existing ufsbi system , fiber block telephone complete with ptt handset suitable to work with block panel and ufsbi of deltron make , supply of patch cord single mode 10 and 15 and 20 mtr , installation and commissioning of above schedule items