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PD CLC TS 50568 — Electricity Metering Data Exchange SMITP B-PSK PLC Communication Profiles (Part 4 Lower Layer PLC Profile; Part 8 Neighbourhood Network SMITP B-PSK PLC Communication Profile)
Electricity Metering Data Exchange — The DLMS/COSEM Suite — SMITP B-PSK PLC Communication Profiles
🔢 PD CLC/TS 50568 is a series of technical specifications published by the British Standards Institution (BSI) and derived from the European Committee for Electrotechnical Standardization (CENELEC) technical specification CLC/TS 50568 for electricity metering data exchange, belonging to the DLMS/COSEM (Device Language Message Specification / Companion Specification for Energy Metering) suite, and specifying how electricity meters exchange data with data concentrators and collection head-end systems over power line communication (PLC). The two parts in this batch, PD CLC/TS 50568-4:2015 (lower layer PLC profile) and PD CLC/TS 50568-8:2015 (neighbourhood-network SMITP B-PSK PLC communication profiles), describe data communication profiles using SMITP B-PSK modulation technology.
💡 Smart meters and automatic metering (AMR/AMI) systems work through a “data communication protocol stack”: the lower layer is the physical medium (power line), the middle layer is the data link and communication profile (e.g., SMITP B-PSK PLC), and the upper layer is the application and data model (DLMS/COSEM). CLC/TS 50568 is the key bridge connecting “meter hardware” and “meter-reading business”.
1. Overview of the Series 📌
The CLC/TS 50568 series is prepared by CENELEC TC 13, the electricity-meter technical committee (the UK participates through PEL/13), belongs to the DLMS/COSEM suite, and provides profiles for different layers of the communication stack. The two parts in this batch are summarised below:
| Standard | Part Topic | Main Content | Year |
|---|---|---|---|
| PD CLC/TS 50568-4:2015 | Lower layer PLC profile | Lower layer (physical/data-link) PLC profile using SMITP B-PSK modulation | 2015 |
| PD CLC/TS 50568-8:2015 | Neighbourhood-network SMITP B-PSK PLC communication profile | PLC communication profile for neighbourhood networks, including the original SMITP B-PSK, local data exchange and IP communication profiles | 2015 |
⚠️ Parts 4 and 8 are positioned at the “lower layer” and “neighbourhood-network overall configuration” of the communication stack respectively: Part 4 focuses on the concrete implementation parameters of the physical/link layer, while Part 8 uniformly defines how to combine and use profiles such as SMITP B-PSK for data exchange in the neighbourhood network (local communication network). Together they form a complete PLC communication solution.
2. Part 4: Lower Layer PLC Profile 🔌
PD CLC/TS 50568-4:2015 specifies the lower layer profile for power line communication using SMITP B-PSK modulation. SMITP (metering communication protocol) B-PSK (B-phase shift keying) is a modulation technology that transmits over the power line in a lower-frequency band, suitable for local communication between smart meters and concentrators. The content of this part typically includes:
- Physical layer: modulation scheme, carrier frequency, baud rate and channel characteristics;
- Data link layer: frame structure, addressing, error control and medium access control (MAC);
- Interface and compatibility: mapping and interface requirements with the upper layer (DLMS/COSEM application layer);
- Conformance requirements: conditions ensuring interoperability between meters and concentrators from different manufacturers.
✅ The role of the lower layer profile is to “unify the underlying physical and link implementation”: as long as each manufacturer implements the B-PSK modulation and frame protocol per the same profile, concentrators can communicate with meters of different brands, achieving equipment interoperability and interchangeability.
3. Part 8: Neighbourhood Network SMITP B-PSK PLC Communication Profile 🌐
PD CLC/TS 50568-8:2015 specifies the SMITP B-PSK PLC communication profiles for neighbourhood networks in the DLMS/COSEM suite. The part uniformly defines three inter-related communication profiles:
- The Original-SMITP PLC B-PSK communication profile: local communication configuration between meters and concentrators in the neighbourhood network based on B-PSK;
- The Original-SMITP Local data exchange profile: configuration for local data exchange (e.g., on-site meter reading, parameter setting);
- The Original-SMITP IP communication profile: IP-based communication configuration enabling metering data to be transmitted over IP networks.
⚠️ Part 8 standardises “neighbourhood-network communication” as a whole: it not only ensures meter—concentrator PLC communication but also uniformly defines local data exchange and IP communication configurations; engineering implementation should select per the overall configuration to avoid mismatched profiles at different layers.
4. Key Technical Requirements 🔧
Combining the two parts, the key technical requirements for electricity-metering PLC data exchange include:
- Unified B-PSK physical implementation: carrier, rate and channel parameters consistent to guarantee cross-manufacturer interoperability;
- Reliable link protocol: frame format, addressing and error control meeting the integrity and real-time requirements of metering data;
- DLMS/COSEM application mapping: correct mapping of lower-layer data to upper-layer data models and objects;
- Multi-profile coordination: PLC, local data exchange and IP configurations implemented in coordination per the overall specification;
- Security and compatibility: communication security meets metering-data-protection requirements and remains compatible with existing metering infrastructure.
5. Engineering Practice and Applications 🛠️
This series is applied in smart-grid and metering areas, including:
- Large-scale smart-meter deployment: meters and concentrators are networked via SMITP B-PSK PLC for automatic meter reading;
- AMI system construction: advanced metering infrastructure implements data collection, tariff management and remote control per the DLMS/COSEM standards;
- Multi-vendor interoperability: unified profiles enable meters, concentrators and head-end software from different manufacturers to interoperate;
- Value-added services: using the IP profile to connect metering data to broader IoT and data-analysis platforms.
💡 Implementation advice: in the tendering and design stage of a smart-meter project, explicitly require equipment to conform to the DLMS/COSEM suite and the corresponding CLC/TS 50568 profiles, and carry out interoperability testing (meter ↔ concentrator ↔ head-end) to ensure reliable, efficient “last-mile” communication.
6. Frequently Asked Questions ❓
❓ Q: What is DLMS/COSEM?
A: DLMS/COSEM is the international standard system for electricity metering data exchange: DLMS defines the message specification and COSEM defines the metering object model and communication services. CLC/TS 50568 is the UK/European implementation specification for power line communication (B-PSK PLC) within it.
A: DLMS/COSEM is the international standard system for electricity metering data exchange: DLMS defines the message specification and COSEM defines the metering object model and communication services. CLC/TS 50568 is the UK/European implementation specification for power line communication (B-PSK PLC) within it.
❓ Q: Why transmit metering data over power line communication (PLC)?
A: PLC uses the existing power line as the transmission medium, requiring no additional wiring, with wide coverage and low cost, especially suited to large-scale networking and automatic reading of residential and commercial meters — one of the mainstream local communication methods of AMI systems.
A: PLC uses the existing power line as the transmission medium, requiring no additional wiring, with wide coverage and low cost, especially suited to large-scale networking and automatic reading of residential and commercial meters — one of the mainstream local communication methods of AMI systems.
❓ Q: What is the difference between Parts 4 and 8?
A: Part 4 is positioned at the “lower layer” (physical/link layer) profile, specifying the B-PSK modulation and frame protocol; Part 8 is positioned at the “neighbourhood-network overall configuration”, uniformly defining the combined use of the original SMITP B-PSK PLC, local data exchange and IP communication profiles.
A: Part 4 is positioned at the “lower layer” (physical/link layer) profile, specifying the B-PSK modulation and frame protocol; Part 8 is positioned at the “neighbourhood-network overall configuration”, uniformly defining the combined use of the original SMITP B-PSK PLC, local data exchange and IP communication profiles.
❓ Q: What role does SMITP B-PSK play in interoperability?
A: B-PSK is the modulation technology on the power line and SMITP is the meter communication protocol; with this lower-layer configuration uniformly implemented, meters and concentrators from different manufacturers can interoperate on the neighbourhood network — the key to multi-vendor metering-system integration.
A: B-PSK is the modulation technology on the power line and SMITP is the meter communication protocol; with this lower-layer configuration uniformly implemented, meters and concentrators from different manufacturers can interoperate on the neighbourhood network — the key to multi-vendor metering-system integration.
❓ Q: Are technical specifications mandatory?
A: CLC/TS is a technical specification and is not itself mandatory; however, its communication-profile requirements are often incorporated into smart-meter and AMI system procurement technical specifications and interoperability acceptance conditions, thereby acquiring practical binding force.
A: CLC/TS is a technical specification and is not itself mandatory; however, its communication-profile requirements are often incorporated into smart-meter and AMI system procurement technical specifications and interoperability acceptance conditions, thereby acquiring practical binding force.