A network like WIS will have to interoperate with a number of other networks, in order to meet various operational requirements, to optimise flexibility and survivability, and to obtain cost effective rationalisation. For this purpose, WIS should be capable of establishing interconnections between various networks and/or interchanging transmission capacities or access facilities. Any interconnection should be established in a secure and automatic mode and they should not compromise the security and internal homogeneity of the network.
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