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Packet reservation multiple access (PRMA) was designed for supporting only voice and data traffics. To investigate the performance of PRMA for video transmission, a modified version of PRMA is needed to be considered. In this paper, a modification to the PRMA protocol proposed for supporting video traffic was investigated using a computer simulation. A real video Imce fde from H.261 codec was used as a video traffic for simplification and accuracy in the simulation study. The simulation results show that the moditied scheme for supporting E261 video traffic could provide acceptable quality-of-service at a given number of video terminal in the system. Furthermore, the modifed PRMA could support simultaneously 28 voice terminals operating at 32 kbps. 28 data terminals generating data packets at a rate of 1200 bps. and one H.261 video terminal at the mean bit rate of 64 kbps, at the channel rate of 720 kbps in the system.