IEC 61334, known as Distribution automation using distribution line carrier systems, is a standard for low-speed reliable power line communications by electricity meters, water meters and SCADA.It is also known as spread frequency-shift keying (S-FSK) and was formerly known as IEC 1334 before IEC's most recent renumbering. It is actually a series of standards describing the researched physical environment of power lines, a well-adapted physical layer, a workable low-power media access layer, and a management interface. Related standards use the physical layer (e.g. Internet Protocol over S-FSK), but not the higher layers.
Part 6-31 specifies a protocol stack for local area networks on twisted pair with carrier signalling. It is mainly used for reading of residential meters, and can be used with or without the Application+ layer protocol specified in part 6-51. Part 6-52 specifies the DLMS server, based on IEC 61334-4-41, established by IEC TC 57. Part 6-41 specifies the physical and data link layer protocols for meter data exchange over PSTN, mainly used for remote reading of high-end meters. It is to be used with the Application+ layer specified in part 6-51. These standards, based on the ISO/OSI layered protocol model, represent a significant move towards interoperability.
The link between the model and the communication protocols is the xDLMS application service element of the COSEM application layer, specified in part 6-53. xDLMS provides services to access the attributes and methods of the objects in a manufacturer- and communication-media-independent way. It is an extended version of the DLMS ASE specified in IEC 61334-41. The application layer is supported by mediaspecific lower layers, based on widely accepted international standards specified in parts 6-47, 6-46 and 6-42 and Internet RFCs.
3)S-FSK PLC based communication profiles: These profiles support data exchange via power lines using S-FSK modulation. In these profiles, the COSEM application layer is supported by the connectionless Logical link control (LLC) sublayer as specified in IEC 61334-4-32, or the LLC sublayer using the data link layer based on the HDLC protocol as specified in IEC 62056-46. The MAC and the Physical layers are as specified in IEC 61334-5-1.
IEC 61334 is a standard for low-speed reliable power line communications. It is also known as S-FSK (Spread Frequency Shift Keying). A typical PLC system in AMI may consist of a backbone-coupled DCU close to a MV/LV transformer. All traffic on the line is initiated by the DCU, which acts on behalf of Central system. More recent narrowband PLC technology include sophisticated techniques such as OFDM (Orthogonal Frequency-Division Multiplexing) to provide higher data rates, and focuses on broadband solutions operating in the 1-30 MHz band . Further, installation of filters highly improves SNR ratios. Despite the difficulties, PLC technologies are at a clear advantage for utility companies as no separate communication 2b1af7f3a8