supply of supply of optical modem with four ethernet ports and built in power supplysupply of optical modem with four ethernet ports and built in power supply,supply of optical modem with four ethernet ports and built in power supply supporting 230v ac / 110vdc / 48vdc from a single socket any one at time , supporting single mode fibre upto 20 kms and suitable for scada - re application of ir supporting rstp and snmp protocol as per rdso specification no. rdso/spn/tc/103/2013 rev.2 or latest.. make- team engineers, model- teamlink 4 port rstp optical mod em or similar. (warranty period : upto 30 months from the date of supply). [ warranty period: 30 months after the date of delivery ] ]