OBS.Network.Functionality
Optical Burst Switching is a relatively new switching technique and is still at the definition
phase, which is clearly indicated by the number of research groups and their publications,
specifically, on new OBS architectures (Callegate, Cankaya, Xiong, & Vandenhoute, 1999;
Dolzer, 2002; Verma, Chaskar, & Ravikanth, 2000; Xu et al., 2001; Yoo, Qiao, & Dixit,
2001), prototypes (Baldine, Rouskas, Perros, & Stevenson, 2002), reservation mechanisms
(Detti & Listanti, 2001; Dolzer, Gauger, Spath, & Bodamer, 2001; Qiao & Yoo, 2000;
Tancevski, Yegnanarayanam, Castanon, Tamil, Masetti, & McDermott, 2000; Turner, 1999;
Wei, Pastor, Ramamurthy, & Tsal, 1999; Xiong, Vanderhoute, & Cankaya, 2000; Yoo, Jeong,
& Qiao, 1997) and assembly mechanisms (Ge, Callegati, & Tamil, 2000; Hu, Dolzer, &
Gauger, 2003; Vokkarane, Haridoss, & Jue, 2002). However, despite the fact that there is
no standard architecture or a universal definition of optical burst switching, OBS networks
assume the following general characteristics:
???. Granularity: The transmission units (called bursts) are macro-packets, each of which
should have a duration that is as short as possible, as it does not require a dedicated
channel, but long enough to be efficiently switched optically; that is, between the
optical circuit switching and optical packet switching granularity.
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