supply of supply and installation of cygnus 845supply and installation of cygnus 845,supply and installation of cygnus 845-4p 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 the 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) having 20 km driving distance. c)four v.21n.23 (e&m) 2-wire/4-wire user interface with auto changeover to quad links in case of failure of all main links. each user port is configurable as 2w or 4w without any restriction. d)unit supports power off fail safe mechanism. in case the unit is switched off, all analog user devices are bypassed to the quad link automatically. - e)unit supports four numbers of potential free contacts which can be linked with data logger/rtu for e1 status, optical status & power supply status. f)unit supports front panel resettable audible buzzer in case of main link fails (optical or e1). g)unit suppqrts front panel led indicators for quad health status, e1 dual, optical dual path. h)uriit %b7 has dual hot standby dc power supply having 24vdc/48vdc i)unit is 1u height with 19 inch rack mountable-facility j)unit supports operating temperature from -5 degree celsius to +55 degree celsius. accepted make/brand:-cygnus or team-link or similar. [ warranty period: 30 months after the date of delivery ]