Product Core Brief
- Part Number: 820-0756
- Label Reference: D20 MIC 10BASE-T 820-0756
- Brand: GE (GE Energy / GE Digital)
- Series: GE WESDAC D20 / D200 RTU
- Core Function: 10BASE-T Media Interface Card (MIC) for GE D20/D200 RTU systems, providing an RJ-45 twisted-pair Ethernet port for the D20 EME Ethernet/Memory Expansion board.
- Product Type: D20/D200 RTU Media Interface Card
- Key Specs: 10BASE-T Ethernet | RJ-45 interface | 10 Mbps | plug-in MIC module | D20 EME compatible | D20/D200 RTU compatible | legacy/obsolete product
- Condition: New Original / New Surplus
Product Introduction
GE D20 MIC 10BASE-T 820-0756 is a Media Interface Card for the GE WESDAC D20/D200 remote terminal unit family. In D20/D200 systems, the MIC provides the physical Ethernet interface for the D20 EME Ethernet/Memory Expansion board. The “10BASE-T” designation means this MIC supplies a standard RJ-45 twisted-pair Ethernet port operating at 10 Mbps.
The D20 EME board itself handles Ethernet and memory expansion functions, while the MIC provides the physical network connection. This separation allows the same EME board to support different media types — such as 10BASE-T, 10BASE-FL, or 10BASE2 — by using the appropriate MIC module.
Because 820-0756 is a legacy MIC part number, the exact revision, supported EME board revisions, and LED status indicators should be verified from the module label and the GE D20/D200 Installation and Operations Guide before commissioning.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Manufacturer | GE (GE Energy / GE Digital) |
| Part Number | 820-0756 |
| Label Reference | D20 MIC 10BASE-T |
| Product Type | D20/D200 RTU Media Interface Card |
| Series | GE WESDAC D20 / D200 RTU |
| Typical Application | Substation automation, SCADA, distribution automation |
| Ethernet Interface | 10BASE-T, RJ-45, twisted-pair, 10 Mbps |
| Compatible Board | GE D20 EME Ethernet/Memory Expansion board |
| Configuration | Plug-in MIC; no jumper-defined Ethernet parameters on the EME board |
| Status | Legacy / Obsolete |
Note: Public documentation confirms the D20 MIC 10BASE-T as a media interface card for the D20 EME board, but the exact revision, LED behavior, and supported EME board variants for 820-0756 should be confirmed from the physical label and GE D20/D200 system documentation.
Quality Control Process (DYNAMIC GENERATION)
- Visual and connector inspection. We check the MIC housing, RJ-45 port, PCB edge connector, LEDs, and mounting hardware for damage or corrosion.
- Continuity and insulation check. The RJ-45 pins, MIC connector, and PCB traces are verified for correct continuity and no short circuits.
- System compatibility check. The part number and 10BASE-T designation are matched against the installed D20 EME board, D20/D200 chassis, and processor configuration.
- Link and diagnostic check. Where a compatible D20/D200 test setup is available, the MIC is seated into the EME board and checked for proper link detection and LED status.
- Final packaging. After passing inspection, the MIC is anti-static bagged and foam-packed for shipment.
Replacement Pitfall Guide (DYNAMIC GENERATION)
❗ Confirm this is a MIC, not an EME board. The D20 MIC 10BASE-T provides the physical Ethernet port; it must plug into a D20 EME board to function.
❗ Match the MIC type to the network media. 10BASE-T is for twisted-pair RJ-45; do not substitute with 10BASE-FL (fiber) or 10BASE2 (coax) unless the network supports it.
❗ Verify EME board compatibility. The MIC must match the installed D20 EME board revision and slot configuration.
❗ Do not confuse with PACSystems or PAC8000 modules. D20/D200 MIC cards are not interchangeable with RX3i, PAC8000, or Series 90 communication modules.
❗ Check RJ-45 cabling and link speed. 10BASE-T runs at 10 Mbps; modern switches must support 10 Mbps or auto-negotiate correctly.
❗ Handle as ESD-sensitive equipment. Always use anti-static handling procedures during removal, installation, and storage.
Keep these in mind and you’ll cut 90% of rework time.
Compatibility Matrix & Benchmarks
| Original Model | Replacement / Successor Model | Compatibility Level | Migration Notes |
|---|---|---|---|
| GE D20 MIC 10BASE-T 820-0756 | GE D20 MIC 10BASE-T 820-0756 | Direct | Same part number; verify revision and EME board compatibility. |
| GE D20 MIC 10BASE-T 820-0756 | Other D20 MIC variants (10BASE-FL, 10BASE2) | Needs Adaptation | Different physical media; requires matching network infrastructure. |
| GE D20 MIC 10BASE-T 820-0756 | D20 EME board | Not Compatible | MIC and EME board are complementary; one cannot replace the other. |
| GE D20 MIC 10BASE-T 820-0756 | PACSystems / PAC8000 modules | Not Compatible | Different platform, backplane, and RTU architecture. |
Benchmark highlights
- 10BASE-T Media Interface Card for GE D20/D200 RTU systems.
- Provides RJ-45 twisted-pair Ethernet port at 10 Mbps.
- Plugs into the D20 EME Ethernet/Memory Expansion board.
- Used in substation automation, SCADA, and distribution automation.
- Legacy product; best suited for existing D20/D200 system maintenance and like-for-like replacement.
