Focusing on the principles and the paradigm of OBS an overview addressing expectable performance and application issues\r\nis presented. Proposals on OBS were published over a decade and the presented techniques spread into many directions. The\r\npaper comprises discussions of several challenges that OBS meets, in order to compile the big picture. The OBS principle is\r\npresented unrestricted to individual proposals and trends. Merits are openly discussed, considering basic teletraffic theory and\r\ncommon traffic characterisation. A more generic OBS paradigmthan usual is impartially discussed and found capable to overcome\r\nshortcomings of recent proposals. In conclusion, an OBS that offers different connection types may support most client demands\r\nwithin a sole optical network layer.
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