Akbar majidi - Dept. member od Islamic azad university, roodan, roodan, Iran.
Ebrahim barazandeh - Dept. member od Islamic azad university, roodan, roodan, Iran.
Nazila jahanbakhsh - Dept. member od Islamic azad university, roodan, roodan, Iran.
Arshad asghari - Dept. member od Islamic azad university, roodan, roodan, Iran.

Time division multiple access (TDMA) is a probabilistic media Access Control (MAC) protocol in which is a channel access method for shared medium network. It allows several users to share the same frequency channel by dividing the signal into different time slots[1]. Carrier SenseMultiple Access (CSMA) is also a probabilistic media Access Control (MAC) in which a nodeverifies the absence of other traffic before transmitting on a shared transmission medium [2].In this project, we plan to use ns2 to simulate the TDMA to transmit data at first, and thensimulate the data transfer with CSMA. After the simulations, we will use AWK to analysis data and then Xgraph to plot the end-to-end delay with two difference amount packet size 48 and 4800 for two protocols. After the simulation, TDMA have larger delay time than CSMA, but TDMA delay is more stable. Therefore, TDMA is a better protocol in our two testing cases

TDMA, CSMA, MAC, AWK, Xgraph