Abstract: The generic S band communication sub-andsystem is designed to support the mission and the telemetry/telecomand data. The imaging system is supported by a total storage capacity of 1 Gbytes of data which could be downloaded to a ground station within 10 min. The downlink and the uplink, both operate in S band at high rate (8 Mbps) in normal operation and low rate (38.4 kbps) during commissioning for the downlink and at amateur low rate (9.6 kbps) for the uplink. This study describes the different module constituting the generic S band communication subsystem.