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This paper elucidates and discusses some aspects of requirements specifications of a power system communication system. The results are based on applied research and procurement work in both academia and industry. Requirements regarding functionality, availability, and classification are treated mainly from a customer's viewpoint. Specification of unavailability instead of availability is proposed. Two concepts of classification and ranking of requirements are aggregated into one method of work. The need for a structured method of work is emphasized. The importance of information security and resilience to intrusion is stressed.