supply of supply, installation, commissioning and testing of master telephone, slave telephone and 24 volt dc power supply unit with maintenance free battery of electronics lc gate communication systemsupply, installation, commissioning and testing of master telephone, slave telephone and 24 volt dc power supply unit with maintenance free battery of electronics lc gate communication system,supply, installation, commissioning and testing of master telephone, slave telephone and 24 volt dc power supply unit with maintenance free battery of electronics lc gate communication system as per rdso/spn/tc/51/2011(rev.3.0) with amendment no.1 or latest (with voice logging facility ). one set consists of: 01 no. master, 03 nos. slave & 01 no. power supply unit. [ warranty period: 30 months after the date of delivery ] , supply, installation, commissioning and testing of master telephone, slave telephone and 24 volt dc power supply unit with maintenance free battery of electronics lc gate communication system as per rdso/spn/tc/51/2011(rev.3.0) with amendment no.1 or latest (with voice logging facility ). one set consists of: 01 no. master, 03 nos. slave & 01 no. power supply unit. [ warranty period: 30 months after the date of delivery ] , supply, installation, commissioning and testing of master telephone, slave telephone and 24 volt dc power supply unit with maintenance free battery of electronics lc gate communication system as per rdso/spn/tc/51/2011(rev.3.0) with amendment no.1 or latest (with voice logging facility ). one set consists of: 01 no. master, 03 nos. slave & 01 no. power supply unit. [ warranty period: 30 months after the date of delivery ]