| http://www.w3.org/ns/prov#value | - ata via a set of carriers; the method being: CHARACTERISED IN THAT: in the event of power failure at the first said network node (30), the method includes the further steps of: selectively providing power to the first node (30) such that the first node (30) operates only via a limited subset of said carriers which limited subset is such as to minimize the power required for the transmission thereo
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