Distributed temperature optical fiber sensors (DTSs) are intrinsic optical fiber sensors that can provide temperature measurements continuously along a fiber. Usually, DTSs rely in Raman based optical time domain reflectometry (OTDR) technologies, in which the temperature can be obtained from the ratio between the Stokes (S) and anti Stokes (AS) bands’ powers. The AS band power is more sensitive to temperature than the S band’s, in the linear regime, these bands arise from molecular vibrations of silica, providing a 13.2 THz frequency shift relatively to the pump source. The use of already installed singlemode fiber based telecommunication networks as sensor networks together with data transmission has attracted a great interest recently, as reported in [1], [2]. Such systems can be used for multiple purposes, such as for detecting vehicle speed, road conditions and environment temperature. However, in these trials, data transmission channels were allocated for sensing purposes, decreasing the data transmission capacity. A possible solution to maintain the network capacity is to use a pump wavelength for sensing away from the transmission windows. To evaluate the viability of such systems, we developed a model based on [3], which estimates the Raman S and AS powers. A 1064 nm pump source, with a pulse width of 10 ns, corresponding to a spatial resolution of 1 m, and different peak powers, were considered. For this pump source, the S and AS bands are expected to be centered in the 1115 nm and 1015 nm, respectively. Different fiber lengths and various conditions of temperature for the fiber are evaluated.