supply of automatic change oven for dac / msdacautomatic change oven for dac / msdac, supply, installation, testing & commissioning of automatic change over device for dac / msdac v.21 / v.23 to optical fibre, stm ( e1 ) standard 19 rack mountable device consisting of two e1 port supporting 120 ohms interface, dual optical ports with ( 1+1 ) hot stand by ( dual core path and single core path ) 20 kms driving distance and four v.21 / v.23 ( e&m ) interface ( 04 ports ( 04 e&m + 04 quad ) ) 2w / 4w interfaces with auto change over mechanism to quad ports 2w / 4w. each port configurable as 2w or 4w no restriction in configuration: unit to support potential free contacts four numbers can be linked with data logger / rtu for e1 status , quad status & power supply status, unit support front panel ressetable audiable buzzer in case of main link fails ( optical or e1 ) : unit to support power off fail safe mechanism when the unit is switched off the inputs is bypassed to the quad cable automatically unit supports front panel led indicators for quad health status; e1 dual, optical dual path, dual dc power supply 18vdc to 72 vdc range: make: team engg / cygnus / lantana / waves / fabio1cx-4p or similar reputed make. ( technical specification as per annexure - b attached ) .