supply, transportation ,installation, and commissioning of 04-channel voice logger as per rd so/spn/tc/38-2002 ver2 or latest to record station gate communication (one channel dedicated for up side gate and one channel dedicate for dn side gate) and remaining 02 channel for vhf/other 2 wire communic ation (not being recorded in control room voice logger), consisting of : 4 channel vdrpu, 13.5v/15 amp sm ps, 12v/65ah smf battery, 6u wall mount rack. all materials required for installation and commissioning t o be arranged by contractor. (includes power cable and other inter connecting cables). note: user manual t o be along with equipment. necessary training related to maintenance and operation to be imparted to all concerned railway staff. (lc gates list enclosed) make ae telelink. or similar, all materials required for inst allation and commissioning to be arranged by contractor (includes power cable and other inter connecting cables.) at 99 stations (locations as per annexure-a) over wat division. [ warranty period: 30 months a fter the date of delivery ] ]