Updated: QOS.4 text in DNSP obligations clarified in April 2016. This was only a text change - the intent behind the obligation has not changed.
Read this document to find about:
the PSN DiffServ region PSN service classes PSN QoS perfromance requirementsThis document contains PSN technical interoperability obligations.
https://www.gov.uk/government/publications/psn-quality-of-service-qos-specification
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