The present document describes the main communication resources involved in a QKD system and the possible architectures that can be adopted when performing a QKD deployment over an optical network infrastructure. The scope of the present document is restricted to QKD deployments over fibre optical networks. Architectural options are also restricted to point-to-point communication. The different entities that can take part in a QKD deployment and the possible contexts of deployment capturing the roles played by the different entities are defined. One specific context (context1) is then addressed where one entity (QKD_O)@ operating QKD Modules@ plans a QKD deployment over an optical network infrastructure@ operated by another entity (NET_O). The information regarding the QKD system parameters and the network parameters to be exchanged (in context1) are listed and prioritized. The corresponding tables@ placed at the end of the present document@ can be used as a standard template for the exchange of information between QKD_O entities and NET_O entities involved in the QKD deployment.