  Multi-wavelength observations of Galactic black hole candidate sources
indicate a close connection between the accretion disk emission and the jet
emission. The recent discovery of an anti-correlated time lag between the soft
and hard X-rays in Cygnus X-3 (Choudhury & Rao 2004) constrains the geometric
picture of the disk-jet connection into a truncated accretion disk, the
truncation radius being quite close to the black hole. Here we report the
detection of similar anti-correlated time lag in the superluminal jet source
GRS 1915+105. We show the existence of the pivoting in the X-ray spectrum
during the delayed anti-correlation and we also find that the QPO parameters
change along with the spectral pivoting. We explore theoretical models to
understand this phenomenon.
