In this note we consider the fluid queue driven by an M/M/1 queue as a
nalysed by Virtamo and Norros [Queueing Systems 16(1994) 373-386]. We
show that the stationary buffer content in this model can be easily an
alysed by looking at embedded time points. This approach gives the sta
tionary buffer content distribution in terms of the modified Bessel fu
nction of the first kind of order one. By using a suitable integral re
presentation for this Bessel function we show that our results coincid
e with the ones of Virtamo and Norros.