LISA’s data and telemetry requirements are relatively modest when compared to many other astrophysics missions. While the precise details are being developed as part of the mission formulaiton process, the rough numbers are known. During normal operations, only one of the three LISA spacecraft will be in contact with the ground. In addition to transmitting its own data, the spacecraft will serve as a relay for data from the other two spacecraft, which will share data over a dedicated inter-constellation link. This is efficient because the separation between spacecraft (2.5Mkm) is roughly 20x smaller than the distance to Earth (approximately 50Mkm). The required data rate to Earth is appoximately 150kbps, or about the speed of a good household modem in the late 1990s. Daily contact will be made with the constellation for a period of roughly 8 hours, resulting in a aggregate data rate of roughly 4GB/day. This will include the primary outputs from the science instrument, auxilliary channels used to monitor the science instrument, and general spacecraft housekeeping data for the full constellation. This data will be processed on ground to produce LISA’s basic measurement product, time-delay interferometry (TDI) variables, which contain the full set of gravitational wave signals in the LISA band as well as residual instrumental noise. The four fundamental TDI variables will be sampled with a rate of a few Hertz, resulting in a data rate of roughly 60MB/day. The TDI data will be used to generate further downstream products such as source catalogs, alerts, etc.