Abstract
This paper presents the definition of a new transfer mode suited for all optical packet switching. A preliminary format of the optical packet has been defined, consisting of a header at fix bit rate and a payload, switched transparently inside the network, able to carry whatever service and bit rate. This optical packet is inserted in a time slot of fixed time length, regardless of the link speed, in order to simplify switches operation and guaranty the network modularity. In this paper the issue of the optimal size of the time slot is addressed, with reference to access delay and traffic shaping.

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