| Feature | D400-S Substation Communication Server |
| Software Options | SubSTATION Server, SubSTATION Explorer |
| Mounting Options | 2U Rackmount |
| Processor | Intel Pentium Celeron M @ 1.0Ghz |
| Solid State Drives | 4GB |
| Optional Storage | 1GB |
| Operating System Options | Windows Embedded Standard (Linux in the future) |
| RAM | 1 GB DDR RAM |
| Serial Port Options | Up to 16 in pairs of RS-232 / RS-485 / Fiber Optic |
| Network Interface Cards | Up to 2 NIC Controllers |
| Integrated HUB | Yes via optional 4-Port Network Modules |
| USB Connections | 5 USB Ports (2 front, 3 rear) |
| IRIG Support | Optional IRIG-B Input via slot 9, Output via slot 10 |
| Other Connections | Rear COM2 Terminal Port, Audio output |
| Monitor Support | VGA Out, monitor optional |
| Input Power | 100-240VAC or 20-55VDC |
| Redundant Power Supply Support | Yes, optional |
| Fanless | Fanless Design |
| Optional Add-ons | Distribution modules (IRIG-B Distribution module option for slot 10) |
| Temperature Rating | -20°C to +65°C |
| Humidity Rating | 5% to 95% relative humidity (non-condensing) |
| DB9 Distributed IRIG | Yes |
| Supports 61850-3 | Yes |
| Budgetary Pricing (USD) | Call for details |
| Warranty | 18 Months |
| Manufacturer | GE Digital Energy |