Radio over fiber is a rather the promising technology for the integration of wireless and wired networks. The main reason for such consideration might be attributed to the possibility of providing services to customers with the two common communication methodologies. The paper investigates performance impairments due to constraints imposed by the MAC layer when optical fiber is used to extend the IEEE 802.11n network. It is shown that data throughput decreases as fiber length increases. In UDP packet transmission the maximum throughput decreases gradually by 16.6% and 18.6% for basic access and RTS/CTS, respectively.