A generic Telecom network is composed of different components supplied by a long list of vendors, these networks are organized in an interwoven topology based on the needs of inter-connectivity, Network Security and resilience.
However in order to understand the Telecom Network it can be segregated in a number of Building Blocks each with distinct capabilities and offering different and distinct services to other blocks, also these blocks have distinct interfaces to connect to other blocks with detailed specifications written and agreed through internationally accepted and agreed governing bodies like ITU, IEEE, etc.
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