supply of multiple media auto changeover converter %u2013 4 ports , multiple media auto changeover converter-4 port, for simultaneously interconnecting digital axle converter, ufsbi, block phone etc. across a block section/ ibs over multiple media. product has t he following features: a)two 120 ohm e1 main links with rj45 connector, having(1+1) hot standby facility b) two optical main links with (1+1 hot standby dual core path and single core path) having20 km driving dist ance. c)four v.21n.23 (e&m) 2-wire/4-wire user interface with auto changeover to quad links in case of failu re of all main links. each user port is configurable as 2w or 4w without any restriction. d)unit supports powe r off fail safe mechanism. in case the unit is switched off, all analog user devices are bypassed to the qua d link automatically. - e)unit supports four numbers of potential free contacts which can be linked with data l ogger/rtu for e1 status, optical status & power supply status. f)unit supports front panel resettable audible buzzer in case ofmain link fails (optical or e1). g)unit suppqrts front panel led indicators for quad health sta us, e1 dual, optical dual path. h)uriit %b7 has dual hot standby dc power supply having 24vdc/48vdc i)uni t is 1u height with 19 inch rack mountable-facility j)unit supports operating temperature from -5 degree cels ius to +55 degree celsius. accepted make/brand:-cygnus or team-link or similar. make/brand- cygnus 845 -4p or similar ( warranty period : upto 30 months from the date of supply) [ warranty period: 30 months a fter the date of delivery ] ]