  Due to the impressive amount of new data provided by the RXTE satellite in
the past decade, our knowledge of the phenomenology of accretion onto black
holes has increased considerably. In particular, it has been possible to
schematize the outburst evolution of transient systems on the basis of their
spectral and timing properties, and link them to the ejection of relativistic
jets as observed in the radio. Here, I present this scheme, concentrating on
the properties of the quasi-periodic oscillations observed in the light curves
and on the link with jet ejection.
