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The Planck Low Frequency Instrument (LFI) will observe the Cosmic MicrowaveBackground (CMB) by covering the frequency range 30-70 GHz in three bands. Theprimary instrument data source are the temperature samples acquired by the 22radiometers mounted on the Planck focal plane. Such samples represent thescientific data of LFI. In addition, the LFI instrument generates the so calledhousekeeping data by sampling regularly the on-board sensors and registers. Thehousekeeping data provides information on the overall health status of theinstrument and on the scientific data quality. The scientific and housekeepingdata are collected on-board into telemetry packets compliant with the ESAPacket Telemetry standards. They represent the primary input to the firstprocessing level of the LFI Data Processing Centre. In this work we show thesoftware systems which build the LFI Level 1. A real-time assessment system,based on the ESA SCOS 2000 generic mission control system, has the main purposeof monitoring the housekeeping parameters of LFI and detect possible anomalies.A telemetry handler system processes the housekeeping and scientific telemetryof LFI, generating timelines for each acquisition chain and each housekeepingparameter. Such timelines represent the main input to the subsequent processinglevels of the LFI DPC. A telemetry quick-look system allows the real-timevisualization of the LFI scientific and housekeeping data, by also calculatingquick statistical functions and fast Fourier transforms. The LFI Level 1 hasbeen designed to support all the mission phases, from the instrument groundtests and calibration to the flight operations, and developed according to theESA engineering standards.

Level 1 on-ground telemetry handling in Planck LFI