DIN EN 62056-8-4:2018 pdf free.Electricity metering data exchange -The DL .MS/COSEM suite -Part 8-4: Communication profiles for narrow-band OFDM PLC PRIME neighbourhood networks (IEC 13/1749/CDV:2017).
4 Targeted communication environments
The DLMS/COSEM communication profiles for narrow-band OFDM PLC PRIME neighbourhood networks are intended for remote data exchange on Neighbourhood Networks (NN) between Neighbourhood Network Access Points (NNAP) and Local Network Access Points (LNAPs) or End Devices using QFDM PLC technology over the low voltage electricity distribution network as a communication medium. The functional reference architecture is shown Figure 1.
End devices — typically electricity meters — comprise application functions and communication functions. They may be connected directly to the NNAP via the C interface, or to an LNAP via an M interface, while the LNAP is connected to the NNAP via the C interface. The LNAP function may be co-located with the metering functions.
A NNAP comprises gateway functions and it may comprise concentrator functions. Upstream, it is connected to the Metering Head End System (HES) using suitable communication media and protocols.
End devices and LNAPs may communicate to different NNAPs, but to one NNAP only at a time. From the PLC communication point of view, the NNAP acts as the Base Node while end devices and LNAPs act as Service Nodes.
NNAPs and similarly LNAPs may communicate to each other, but this is out of the scope of this International Standard, which covers the C interface only.
When the NNAP has concentrator functions, it acts as a DLMS/COSEM client. When the
NNAP has gateway functionality only, then the HES plays the role of a DLMS/CQSEM client.
The end devices or the LNAPs play the role of DLMS/COSEM servers.
A mixed architecture is also possible, i.e. both the HES and the NNAP can act as a client.
5 Use of the communication layers for this profile
Information related to the use of the standard specifying the lower layers Recommendation ITU-T G.9904:2012 defines PHY and MAC layers for power line communication using OFDM. At the top of the MAC layer it defines also a number of Convergence layers, the purpose of which is to match the lower protocol layers with the higher protocol layers.DIN EN 62056-8-4 pdf download.