Emulation creates an environment that has ability to inject traffic from a simulator to a live network and vice-versa. The ns-3 is a freely available simulator for research and development in the field of computer network protocols. It has capability of emulation with limited functionality. To validate ns-3 applications and protocols in realistic scenario, we are required to integrate ns-3 with testbeds. In current scenario, ORBIT lab, Emulab and PlanetLab are public domain testbeds preferred by researchers. ORBIT is an Open access Research testBed for next generation wIreless neTworks. It is intended to support real world evaluation of network protocols validated on a emulator. It is used for experimentation of network topologies, programming the radio nodes, executing experiments and collecting results. This paper explain in brief how to integrate ns-3 with ORBIT testbed by emulating a small client-server & ping applications with extended ns-3 battery model on ORBIT.