scope:

The present document defines the stage 2 Customer Network Devices (CND) specifications, including architectural building blocks to be included in the Customer Network Devices to support the interworking with control plane NGN architecture, both for the transport layers (NASS, RACS) and for the service layer. The present document will also define the reference points between the NGN architectural blocks involved and the corresponding CNDs functions here defined (for the cases in what the CNG will be transparent for the service and control planes point of view), as well as between the Customer Network Devices and the CNG when appropriate. The present document will perform, as first step, a categorization of the different user equipment with reference to the type of service supported and the different levels of implementation of the related functionalities.

Please note that in relation to the Customer Network Devices for IPTV usage the present document will cover only the classification step and will not provide any detail about the architecture and reference points. The IPTV CND are specified in TS 185 009 [20].