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The GE D20 EME 10BASE-T (full designation often GE D20 EME210BASE-T or D20 EME 10BASE-T Media Interface Card, part numbers such as 526-2110) is a 10 Mbps Ethernet Media Interface Card (MIC) / Network Card Module designed for the GE D20 and D200 Substation Controller / RTU platforms. It provides reliable 10BASE-T Ethernet connectivity (RJ45 ports) for communication with SCADA systems, HMIs, peer RTUs, and other devices in substation automation applications. The GE D20 EME 10BASE-T installs in the left-most slot of the D20MX or D200 chassis and connects internally via a dedicated cable (P/N 977-0298) to the D20EME Ethernet/Memory Expansion Board. It supports configurable jumper settings for LAN A and LAN B operation, enabling redundant or segmented network topologies. The GE D20 EME 10BASE-T is hardened for harsh substation environments with high noise, vibration, and temperature extremes, and it remains a key legacy component for sustaining older D20-based RTU systems in power transmission and distribution. The GE D20 EME 10BASE-T ensures deterministic, low-latency Ethernet data exchange critical for real-time monitoring, control, and fault reporting in utility infrastructure.

Model,GED20 EME 10BASE-T (D20 EME210BASE-T / MIC 10BASE-T)

Manufacturer,General Electric (GE Grid Solutions / GE Vernova)

Series,D20 / D200 Substation Controller / RTU

Product Type,10BASE-T Ethernet Media Interface Card / Network Card Module

Ethernet Standard,IEEE 802.3 10BASE-T (10 Mbps over twisted-pair)

Ports,2 × RJ45 (typically LAN A / Channel 1 and LAN B / Channel 2)

Installation Slot,Left-most slot in D20MX or D200 chassis

Internal Connection,J1 to D20EME Ethernet/Memory board via cable P/N 977-0298

Configuration,Jumpers JP1 (LAN A) and JP2 (LAN B) for operational modes

Diagnostics,"Link test, jabber detection, SQE (configurable)"

Operating Temperature,Substation hardened (typically -40°C to +85°C)

Applications,"Substation RTU, SCADA communication, DNP3/Modbus over Ethernet, peer-to-peer messaging"

Additional Features,"Redundant LAN support, industrial-grade noise immunity, diagnostic support"

Power down the D20/D200 chassis and install the GE D20 EME 10BASE-T into the left-most slot, ensuring proper backplane alignment.

Connect the interface cable (P/N 977-0298) from J1 on the module to the D20EME Ethernet/Memory board.

Attach Cat5 or better twisted-pair Ethernet cables to the two RJ45 ports (J2 for LAN A, J3 for LAN B).

Set configuration jumpers JP1 and JP2 according to the required LAN architecture (consult GE documentation for Option 1A–1D defaults).

Restore power and verify link/activity LEDs or D20 system diagnostics show healthy Ethernet status.

Configure IP addresses, protocols (e.g., DNP3, Modbus TCP), and network parameters in the D20 controller software.

Test connectivity to SCADA masters or peer devices and perform data exchange validation during commissioning.

Completely de-energize the D20/D200 chassis and all connected circuits before installing or removing the GE D20 EME 10BASE-T to prevent electrical hazards or module damage.

Use proper ESD protection when handling the card to safeguard sensitive Ethernet circuitry.

Ensure the interface cable (P/N 977-0298) is securely connected with correct orientation; do not force connectors.

Use high-quality shielded Cat5 cable (maximum 100 m length) and route Ethernet cables away from high-voltage power lines to minimize EMI.

Confirm jumper settings (JP1/JP2) match the intended redundant or segmented network design before powering on.

Verify the D20 chassis power supply can support the additional load and provide stable voltage.

After installation, run full D20 self-diagnostics, test both LAN ports, and clear any communication faults before placing the RTU online.

Monitor LEDs on the GE D20 EME 10BASE-T daily for link status, activity, and any fault indications on LAN A and LAN B ports.

Check D20 controller diagnostics and SCADA event logs for Ethernet errors, packet loss, link-down alarms, or jabber/SQE issues.

Inspect RJ45 connectors and cables weekly for looseness, corrosion, or physical damage in the substation environment.

Verify network redundancy (if configured) by monitoring both LAN channels and testing failover during low-impact periods.

Review communication statistics (e.g., error rates, throughput) via the D20 configuration tools or HMI.

Clean dust from the module, connectors, and chassis vents (power off) using low-pressure compressed air every 1–3 months depending on site dust levels.

During scheduled maintenance outages, re-verify jumper settings, test cable integrity, perform full network loop checks, and backup D20 configurations.

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