ABB AFS series switches

Network protocol compliance: Fully compatible with RFC series standards (such as RFC 791 IP protocol, RFC 793 TCP protocol, RFC 2131 DHCP protocol, etc.), ensuring interoperability with devices from different vendors.

Three typical application scenarios and solutions

（1） Substation automation communication

Scenario requirements: Based on the IEC61850 protocol, communication between IED devices and between IEDs and station control computers is implemented to transmit key data such as GOOSE interlocking signals, trip instructions, and sampling values. Low latency (millisecond level), high availability (high MTBF), and resistance to electromagnetic interference are required, with communication distances typically within a few hundred meters.

Solution:

Hardware configuration: Choose AFS670/675 rack mounted switches (high port density) or AFS650 compact switches (small substations), with multi-mode optical ports as the main configuration (suitable for short distance transmission), and configure redundant power supply.

Network architecture: Pure Layer 2 switching network, using redundant topology (ring or dual link), enabling MRP/E-MRP fast redundancy protocol to ensure ≤ millisecond level switching in case of link failure.

Optimization design: Divide business (such as control signals, sampling values, and operation and maintenance data) through VLANs, set priority queues for QoS, and ensure priority transmission of key data such as trip instructions; Adopting SNMP protocol to achieve centralized network management, LED indicator lights and alarm contacts provide real-time feedback on device status.

（2） Communication between distribution substations

Scenario requirements: Based on the IEC60870-5-104 protocol, transmit real-time SCADA data, while also carrying VoIP voice communication, renewable energy (such as wind power, photovoltaic) data upload and other services; The communication distance is usually several kilometers, and it needs to adapt to different urban and rural environments, requiring network redundancy, high security, and wide temperature operation.

Solution:

Hardware configuration: Select AFS677/AFR677 rack enhanced switch (backbone network) or AFS655 compact switch (terminal access), with GbE ports for backbone network and single-mode optical ports for uplink configuration (suitable for long-distance transmission).

Network architecture: FE/GbE backbone network, using redundant ring topology and enabling MRP/E-MRP protocol; The AFR677 model can achieve multi subnet interconnection through L3 routing functions (RIPv1/v2, OSPFv2), and VRRP protocol ensures routing redundancy.

Security and Management: Enable IEEE802.1x authentication and SSH encryption to ensure secure data transmission; Monitor the status of the entire network through a centralized management system, adapt to AC/DC wide voltage input power supply, and meet the power supply needs of field substations.

（3） In plant communication

Scenario requirements: Support in plant security (CCTV, access control), public broadcasting, equipment monitoring and other business communication, requiring high bandwidth (adapted to CCTV video streaming), convenient equipment power supply (PoE), time synchronization (log/video timestamp), and fast fault recovery.

Solution:

Hardware configuration: Select the AFS670/675 model (camera powered) that supports PoE function, connect the GbE upstream port to the central server, and configure optical ports for transmission links over 100 meters.

Network architecture: FE/GbE backbone network, using star or ring topology, with RSTP protocol enabled to ensure link redundancy; Port rate control prevents video streams from occupying too much bandwidth.

Key function: Implement time synchronization of terminal devices through SNTP protocol; IEEE802.1x port authentication protects the security of outdoor camera access; Quickly restart the device after power failure to reduce business interruption time.

Customer core revenue

Environmental adaptation and reliability assurance: Power grade hardware design, high EMC/EMI anti-interference capability, wide temperature operating range, redundant power supply, and fanless design ensure long-term stable operation in harsh environments of substations, with excellent MTBF (mean time between failures) performance.

Business continuity improvement: The Fast Redundancy Protocol (MRP/E-MRP) enables millisecond level switching of link failures, coupled with multiple security protection mechanisms, to ensure "zero interruption" transmission of critical businesses such as SCADA and IEC61850.

Deployment and operation efficiency optimization: Supports multiple installation methods of 19 inch rack/DIN rail, modular design (AFS670/675) for easy port expansion; Multi dimensional management tools (WEB/Telnet/SNMP), automatic topology discovery, fault alarms, and other functions reduce operational complexity.

Maximizing investment value: Port density can be expanded from 8 to 28, supporting functional extensions such as FE/GbE, PoE, L3 routing, etc., adapting to different scale requirements from small and medium-sized substations to large distribution networks; Cross vendor and cross protocol compatibility capabilities, protecting existing equipment investments and supporting future smart grid application upgrades.