In this paper, Just-In-Time (JIT), Just-Enough-Time (JET) and Horizon signalling schemes for Optical Burst Switched Networks (OBS) are presented. These signaling schemes run over a core dWDM network and a network architecture based on Optical Burst Switches (OBS) is proposed to support IP, ATM and Burst traffic. In IP and ATM traffic several packets are assembled in a single packet called burst and the burst contention is handled by burst dropping. The burst length distribution in IP traffic is arbitrary between 0 and 1, and is fixed in ATM traffic at 0,5. Burst traffic on the other hand is arbitrary between 1 and 5. The Setup and Setup ack length distributions are arbitrary. We apply the Poisson model with rate λ and Self-Similar model with pareto distribution rate α to identify inter-arrival times in these protocols. We consider a communication between a source client node and a destination client node over an ingress and one or more multiple intermediate switches.We use buffering only in the ingress node. The communication is based on single burst connections in which, the connection is set up just before sending a burst and then closed as soon as the burst is sent. Our analysis accounts for several important parameters, including the burst setup, burst setup ack, keepalive messages and the optical switching protocol. We compare the performance of the three signalling schemes on the network under as burst dropping probability under a range of network scenarios.
We present a formal protocol description for a Just-In-Time
(JIT) signaling scheme running over a core dWDM network which utilizes
Optical Burst Switches (OBS). We apply an eight-tuple extended finite
state machine (EFSM) model to formally specify the protocol. Using
the EFSM model, we define the communication between a source client
node and a destination client node through an ingress and one or multiple
intermediate switches. We worked on single burst connections that
means setting up the connection just before sending a single burst
and then closing the connection as soon as the burst is sent. The
communication between the EFSMs is handled through message transfer
between protocol entities.