The sending rate of commonly used TCP protocols is tightly
coupled to packet loss within the network: a high rate of packet loss will
cause a sender to slow down, thereby reducing the network load and
decreasing subsequent packet loss rates. In this paper, we combine a widely
verified source rate TCP model with an Optical Burst Switching (OBS)
loss model, to find fixed-point input loads and loss rates for an OBS link
carrying TCP traffic. In doing so, we show that if OBS networks are to be
efficiently used to carry TCP traffic, many wavelengths with full wavelength
conversion are required.