HP Compaq Presario,Presario 1515 Supplementary Manual page 44

This reminder is provided to call the CATV (cable television) system installer's
attention to Section 820-40 of the NEC (National Electrical Code), which provides
guidelines for proper grounding and, in particular, specifies that the cable ground
shall be connected to the grounding system of the building, as close to the point of
cable entry as practical.