Abstract: In this paper we discuss the architecture and the implementation of 5 Mbps over-the-air data rate, burst mode data link which has the capabilities of the upstream and downstream transmission in a single module with symmetrical data rates in time division duplex (TDD) manner. The data link operates in the S band. In this paper, we discuss the various RF challenges that exist on a RF system-level and show how such challenges can translate into implementable circuit designs. The reason for a TDD-based RF front end is that TDD is known to offer cost advantages as compared to FDD-based system. The additional advantage is that it uses less space compared to FDD and where size is an issue. The fundamental subsystem blocks such as synthesizers, filters and power amplifiers are where most of the RF front end transceiver costs reside. We also discuss some of the important modem specifications for RF and baseband and the implications for the design of RF circuits, which include SNR, channel bandwidths, RF bands, noise figures, output power levels, and gain setting.