GB/T 40779-2021 in English
VALIDInformation technology—Telecommunications and information exchange between systems—Low-voltage power line communication protocol for urban street light access
- Issued on:2021-10-11
- Implemented on:2022-05-01
- File Format:PDF
- Delivery:Via email within 5 business days
$505.00
| Standard No: | GB/T 40779-2021 |
| Document status: | VALID |
| Title in English: | Information technology—Telecommunications and information exchange between systems—Low-voltage power line communication protocol for urban street light access |
| Title in Chinese: | 信息技术 系统间远程通信和信息交换 应用于城市路灯接入的低压电力线通信协议 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 5 business days |
| Issued on: | 2021-10-11 |
| Implemented on: | 2022-05-01 |
| ICS Classification: | 35.110-Networking |
| Chinese Classification: | L77-Software engineering |
| Professional Classification: | GB-National Standard |
| Related Topics: | low information throughput
power line communication GBT40779 GB/T 40779-2021 |
《GB/T 40779-2021信息技术 系统间远程通信和信息交换 应用于城市路灯接入的低压电力线通信协议》由TC28（全国信息技术标准化技术委员会）归口，主管部门为国家标准化管理委员会。
Introduction
Analysis of the core content of the standard
GB/T40779-2021 specifies the protocol architecture and technical requirements of the urban street light communication system based on low-voltage power lines (220V/380V), including a three-layer protocol stack of application support layer, data link layer and physical layer, supporting typical application scenarios such as street light control and status monitoring.
Comparison of Key Technologies of Protocol Stack
| Protocol Layer | Core Functions | Typical Parameters | Technical Features |
|---|---|---|---|
| Application Support Layer | Network Management, Data Framing | Frame Length≤511 Bytes | Support 16 Management Commands |
| Data Link Layer | Networking Routing, CSMA/CA | Number of Retransmissions≤3 | Support Source/Blind Routing |
| Physical Layer | OFDM Modulation | Bandwidth 66.0156kHz | Power frequency zero-crossing synchronization |
Typical application scenario examples
Street light fault active reporting process
- The slave node detects a lamp failure event
- Sends the event reporting command (CMD=0x0E) to the master station
- The master station replies with an event confirmation frame to suppress duplicate reporting
- Maintenance personnel handle the event according to the event level (normal/important)
Technical points: The event type field contains structured information such as node type and event level to ensure priority control of event processing.
Key technologies of the physical layer
Adopting narrowband OFDM technology, key parameters:
- Working frequency band: 357.42-423.44kHz
- Subcarrier groups: 17 groups (including 1 pilot subcarrier)
- Modulation mode: DQPSK/DBPSK optional
- Coding scheme: RS+convolutional code cascade
Avoid interference in specific frequency bands of power lines through static subcarrier shielding (MSG) technology.
Implementation Suggestions
Network Deployment Optimization
1. Phase Identification: Use the Send Phase field (A/B/C phase) of the MAC frame control field to implement cross-phase relay
2. Routing Strategy: Use Source Routing in dense areas and Blind Routing in sparse areas
3. Channel Optimization: Adjust the backoff parameters (macBE/macNB) according to actual measurements
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