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Effects of Packet Length in Multiple Optical Channels for Local Area Network Employing OMNET

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  Effects of Packet Length in Multiple Optical Channels for Local AreaNetwork Employing OMNET++  Aznor Hanah Abdul Halim 1,a , R.Badlishah Ahmad 2,b , Abid Yahya, NorlydianaRamli, Phak Len 1,2,3  School of Computer and Communication EngineeringUniversiti Malaysia PerlisPerlis, Malaysia a aznorhanah! !#yahoo$com, % %adli#unimap$edu$my Keywors!  Ethernet, Mutiple Channel &'(, )ueuing delay, *hroughput, +M$ Abstract.  The advances in Wavelength Division Multiplexing (WDM) technology havetremendously increased the bandwidth of a single fiber optic, for local and metropolitan areanetwork (! and M! )# This paper presents an analysis on packet length for multiple opticalchannels# $n this work %thernet is coupled with WDM to decrease the average &ueuing delay andincreases the normali'ed throughput# The performances of three channels with several range of  packet length were evaluated by employing discrete event simulator# $t has been proved that longer  packets showed better performance on throughput however it increased the average &ueuing delay#acket length in range of *+-./01 bits per packets showed similar result of throughput withnormal packet length for %thernet (201.010** bits per packets)#  Introduction Ethernet is a frame based computer networking technology for Local AreaNetwork. It is standardized as IEEE 80.! medium access method called arrier#ense $ultiple Access with ollision %etection & #$A' %(. )he originalstandard was de*ned for hub based twisted pair Local Area Network &LAN( andoperates at +0$bps o,er a ma-imum distance of +00 meters. At +0$bps thispropagation delay euals /+ bits or 1 bytes2 which was selected as theminimum frame length or minislot. In Ethernet LAN2 the terminal transmissionis broadcast o,er the hub using #$A' % for the $edium Access ontrol &$A (protocol. A station will start transmit a frame when the channel is silent andcontinue to listen that can occur if other station also begins to transmit. If collision occurs2 the station will abort the transmission and start scheduling totransmit using truncated binary e-ponential backo3 &4E4( algorithm. If aframe is about to undergo its nth retransmission attempt2 then itsretransmission time is determined by selecting an integer ,alue in the rangebetween 0 and  k 5+2 where k6min&n2+0(. )here are many ad,antages for using Ethernet for Local Area Networks andthat is why many prefer to choose this technology.7+ Network with fewnumbers of nodes has less collision and can reduce the access delay. 9or thismultiple optical channel network2 :a,elength %i,ision $ultiple-ing &:%$(technology being used in subdi,iding the optical bandwidth. :%$ networks arebased on *- recei,ers and tuneable transmitter. )he logical topology is anarray of hubs where each station can listen and select the hub to transmit a  frame. )he star physical topology is chosen as it has low5power reuirementswith an optical power budget ad,antage o,er other schemes and it alsoensures a fair access. )hose networks ha,e a potential throughput in the orderof )erabits per second &)bit's(.
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