scope:

This draft European Telecommunication Standard (ETS) describes the direct interconnection between European Metropolitan Area Networks (MANs), as defined in European MAN ETSs, by means of dedicated links.

Interworking between MANs and other networks is outside the scope of this ETS.

Although MAN interconnection is intended to cover all services as defined in ETS 300 211 [1] (i.e. connectionless, isochronous and connection-oriented non-isochronous), this ETS is restricted to the connectionless service, as defined in ETS 300 217 [2].

Interconnection within a network operator domain and between different network operator domains is specified.

This ETS provides the general principles and functional requirements and specifies the corresponding interfaces for interconnection of MANs, assuming ETS 300 211 [1] as a basis.

The specefecation of the interfaces between MAN Switching Systems (MSSs) is based on Distributed Queue Dual Bus (DQDB) protocol as specified in ETS 300 212 [3].

The interconnection of MSSs via Asynchronous Transfer Mode (ATM) links is specified in DE/NA-2104: "Interconnection of MSSs based on an ATM interface" (work item revised from ETR to ETS status).

This ETS defines the reference configuration, functional blocks, and their corresponding Protocol Reference Models (PRMs), related to MAN direct interconnection.

Neither routeing protocol, nor congestion procedures are specified.

The scope of this ETS is presently limited to the case where there is no need for an explicit operator selection.

The interfaces specified in this ETS are intended to directly interconnect two MSSs.