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Network-network interface meaning

What does Network-network interface mean?
In legal and commercial practice, a network-network interface (NNI) describes the technical specifications that govern how two electronic communications networks interconnect so that services work across the handover point. It covers the physical or virtual access, signalling and protocol stack (for example Ethernet, IP, SIP/SS7), and operational parameters such as addressing, quality of service, timing, security and fault management. Each provider offers an NNI at the interconnection point; only compatible NNIs enable interoperability. “Network-network interface” is not generally a defined statutory term in the UK or Ireland. It is an industry and contractual expression used in interconnection agreements, reference offers and technical annexes, and is recognised in regulatory contexts. Ofcom and ComReg frameworks on interconnection and network access may require publication of interface information and transparency about technical characteristics where obligations apply. Key legal significance includes: defining the demarcation point between providers; allocating responsibilities for service levels, testing, maintenance and remedies; ensuring non-discriminatory, interoperable interconnection; and supporting compliance with regulatory duties. Usage and legal effect are broadly consistent across England & Wales, Scotland, Northern Ireland and Ireland, though the precise disclosure and access obligations arise under the respective Ofcom and ComReg regimes and any SMP or access-specific conditions.
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PRACTICE NOTES
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