a group of specified users of a data network that is assigned a facility which permits them to communicate with each other but precludes access to or from all other users of the network
The loss of a part of those revenues (Esc 7,423 billion in 1997 on a turnover of more than Esc 375 billion) could have implications for the financing of the universal service, since at the same time Portugal Telecom will be affected by the liberalization of satellite communications and of the provision of services to closed user groups.
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