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This DS3 System Services Protocol document is supplementary to the DS3 System Services Agreement. It provides information on Operational Requirements and Performance Monitoring requirements that need to be satisfied by Service Providers and their respective Providing Units as part of the DS3 System Services contractual arrangements. It is one of two supplementary documents referenced in the main Agreement, the other being the DS3 System Services Statement of Payments. An overview of the documents is given in Figure 1. This version of the Protocol document and the associated governance arrangements for changes to the document apply to the Regulated Arrangements only. The approach for any future arrangements will be consulted on separately.