supply of supply, installation,wiring,testing and commissioing of signal post telephone spt(half duplex) at ibs location and adjacent station .supply, installation,wiring,testing and commissioing of signal post telephone spt(half duplex) at ibs location and adjacent station .,supply, installation,wiring,testing and commissioing of signal post telephone spt(half duplex) at ibs location and adjacent station . (each set shall comprise one no. of signal post telephone spt) master unit (which shall be installed on ibs post) along with one no. of slave unit to be installed in sm office suitble for workingon 24v dc and suitble for 25kv re area as per intruction of site incharge,aces make or similar. note: the contractor shall ensure that there is no interference in communication between the master and s lave due to re induction.cable from ib signal unit to the cable termination board in sms room/relay room will be provided railway. [ warranty period: 30 months after the date of delivery ] ]