supply of supply installation testing and commissioning of gateways as per schedule of requirements , supply, installation, testing and commissioning of dcus/gateways/ allocation of sim network service provider and the arrangement of sim cards to enable reliable medium for two-way communication between smart meter & amp:, hes (head end system) over rf mesh network/cellular network. 1. the dcu/ gateway shall be compatible with the smart meters mentioned above. rf mesh network should use 865-86 7 mhz frequency band. 2. the data acquisition (push/pull) frequency shall be configurable 15 min, 30 min o r 60 minutes. it shall push events such as tamper, power off etc. to hes immediately on occurrence/receipt from meters. 3. it shall have provision for the cellular, wifi and ethernet communication for the backhaul to hes. 4. sufficient number of gateways shall be installed in such a way that all the meters are covered in th e network efficiently. 5. it shall be capable to handle data of minimum 500 nos. of any type of smart meter (1ph/3ph). it shall be able to communicate with the nearest meters at a distance of at least 300 m, dependi ng on topographical features. 6. communication of the nearest meters with other meters shall be establish ed through appropriate mesh formation. rf mesh shall support self-forming and self-healing features. 7. rf mesh shall support at least 15 no. of hops. 8. the equipment shall be weather-proof and dust-proof (minim um rating: ip54 for indoor and ip65 for outdoor installation). it shall have rechargeable battery with backup for 1(one) hour for normal meter reading, to push tamper event, carry out on demand reading, etc. 9. it sha ll have passed the following emc tests from reputed lab: conducted emission, electrostatic discharge (esd ), radiated immunity, electrical fast transient (eft) - burst, surge, rf conducted disturbances. 10. rf mes h network shall be established to meet the slas as mentioned in tender document. 11. replacement warra nty period shall be 66 (sixty-six) months from the date of supply or 60 (sixty) months from the date of com missioning, whichever is earlier. [ warranty period: 30 months after the date of delivery ] ]