"The draft European Telecommunication Standard (ETS) describes the basic principles and network architecture for an European Metropolitan Area Network (MAN). This ETS defines and describes the MAN reference configuration and the functional blocks between the Customer Network (CN) and the MAN switching system@ which is described in Annex A (informative). In addition@ this ETS defines the protocol reference model for MANs@ and is the basis for the development of companion ETSs related to MAN protocols (PrETS 300 212 to prETS 300 216@ [19] to [23]@ inclusive). General aspects of MAN management are also defined in this ETS. More detailed information will be provided in other standards on MAN management. The MAN definition takes into account the final goal of providing an easy integration with Broadband integrated Services Digital Network) B-ISDN). The description of interworking aspects between the MAN and the transit network will be provided in other standards on MAN interconnection. The protocol chosen as the basis for this ETS is the IEEE Standard 802.6 [1] ""Distributed Queue Dual Bus (DQDB)"". This specification of performance figures is outside the scope of this ETS."