Engineering / Operator Workstation Mainboard Reference Design
An illustrative rack-mount / tower industrial workstation mainboard design for DCS / SCADA engineering stations, operator stations and plant-level (L3) monitoring terminals: x86 processor, ATX 24-pin + EPS 8-pin power, two 2.5G copper ports connecting to the control network and the management network (or forming a redundant dual network), an optional 10G SFP+ optical uplink to the plant core switch, a dedicated BMC IPMI out-of-band management port, two RS-232 serial ports and USB 3.2, a PCIe x16 graphics slot for multi-display output and an onboard VGA maintenance display port. This page gives the function, selection notes and available VOOHU part numbers for 31 component positions.
Illustrative PCB ⇄ Schematic
The illustrative layout shows the placement and component positions; click any position to view its selection notes, recommended parts and package. The board is an illustration arranged neatly by functional zone (not the actual layout); the Ethernet ports, SFP+ cage, USB, serial ports, VGA and ATX / EPS power connectors sit along the bottom edge, and the graphics card, memory modules and SSD are plug-in external nodes.
The two 2.5G ports, LAN1 (control network) and LAN2 (management network), are identical; only 1 port and 1 differential pair are drawn (2.5GBASE-T uses 4 pairs, A/B/C/D identical). RJ45 J1 is a dual jack without magnetics; the cable side is isolated by discrete 2.5G LAN transformers T1 / T2 (WHSQ24002TG), and the PHY-side pairs are clamped by ESD arrays D1–D4 (WHALD03G4U) before reaching the 2.5G PHY JL4201-NI, which connects to the processor's integrated MAC via SGMII / 2500Base-X. Center-tap connection, termination and crystal load capacitor values per the PHY / transformer datasheets.
Board bill of materials
Click any row to jump to that position and view its selection notes
| No. | Zone | Position | Ref. | VOOHU category | Recommended part | Availability |
|---|---|---|---|---|---|---|
| 01 | A 2.5G dual ports | Dual RJ45 (LAN1 control network / LAN2 management network) | J1 | RJ45 Connectors | SYT561288AB2A3DY1027 | VOOHU |
| 02 | A 2.5G dual ports | 2.5G LAN transformer ×2 | T1 T2 | 2.5G/5G BASE-T | WHSQ24002TG | VOOHU |
| 03 | A 2.5G dual ports | Ethernet ESD array ×4 | D1 D2 D3 D4 | TVS / ESD | WHALD03G4U | VOOHU |
| 04 | A 2.5G dual ports | 2.5G PHY ×2 (SGMII / 2500Base-X) | U1 U2 | Ethernet PHY | JL4201-NI | VOOHU |
| 05 | A 2.5G dual ports | PHY 25MHz crystal ×2 | Y1 Y2 | — | — | Non-VOOHU |
| 06 | B 10G uplink · USB | SFP+ cage + 20-pin connector (10G uplink) | J2 | SFP Cage / SFP Connectors | WHSFP10211W037 | VOOHU |
| 07 | B 10G uplink · USB | SFP+ supply filter inductor ×2 | L1 L2 | Molded Inductors | WHYTA0420 Series | VOOHU |
| 08 | B 10G uplink · USB | USB 3.2 Type-A receptacle (dual-stack) | J3 | — | — | Non-VOOHU |
| 09 | B 10G uplink · USB | USB ESD array | D5 | TVS / ESD | WHTA5V01P2C | VOOHU |
| 10 | C IPMI · Serial · VGA | IPMI management RJ45 (with LEDs) | J4 | RJ45 Connectors | SYT561188AB1A1DB4 | VOOHU |
| 11 | C IPMI · Serial · VGA | Gigabit LAN transformer | T3 | Gigabit LAN Transformers | WHSG24002TG | VOOHU |
| 12 | C IPMI · Serial · VGA | Ethernet ESD array ×2 | D6 D7 | TVS / ESD | WHALD03G4U | VOOHU |
| 13 | C IPMI · Serial · VGA | Gigabit PHY (RGMII) | U3 | Ethernet PHY | JL2101C-NI | VOOHU |
| 14 | C IPMI · Serial · VGA | PHY 25MHz crystal | Y3 | — | — | Non-VOOHU |
| 15 | C IPMI · Serial · VGA | COM1 / COM2 serial ports (dual-stack DB9 male) | J5 | — | — | Non-VOOHU |
| 16 | C IPMI · Serial · VGA | Serial ESD ×2 | D8 D9 | TVS / ESD | WHALD30E2B | VOOHU |
| 17 | C IPMI · Serial · VGA | RS-232 transceiver | U4 | — | — | Non-VOOHU |
| 18 | C IPMI · Serial · VGA | VGA port (HD D-SUB 15-pin female) | J6 | D-SUB Connectors | WHB04015611ADF4 | VOOHU |
| 19 | D Core | x86 processor (integrated Ethernet MAC) | U5 | — | — | Non-VOOHU |
| 20 | D Core | DDR memory slot ×2 | J7 J8 | — | — | Non-VOOHU |
| 21 | D Core | Main clock crystal | Y4 | — | — | Non-VOOHU |
| 22 | D Core | M.2 NVMe slot | J9 | — | — | Non-VOOHU |
| 23 | D Core | PCIe x16 graphics slot | J10 | — | — | Non-VOOHU |
| 24 | D Core | BMC management controller | U6 | — | — | Non-VOOHU |
| 25 | D Core | SPI flash (BIOS / BMC firmware) | U7 | — | — | Non-VOOHU |
| 26 | D Core | BMC core supply filter molded inductor | L3 | Molded Inductors | WHYTA0420 Series | VOOHU |
| 27 | E Power | ATX 24-pin + EPS 8-pin power input | J11 J12 | — | — | Non-VOOHU |
| 28 | E Power | CPU multiphase VRM (controller + DrMOS ×3) | U8 U9 U10 U11 | — | — | Non-VOOHU |
| 29 | E Power | CPU VRM molded inductor ×3 | L4 L5 L6 | Molded Inductors | WHYT1030 Series | VOOHU |
| 30 | E Power | Sync buck ×3 (memory / BMC / other rails) | U12 U13 U14 | — | — | Non-VOOHU |
| 31 | E Power | DC-DC molded inductor ×3 | L7 L8 L9 | Molded Inductors | WHYT0630 Series | VOOHU |
Resources & downloads
Board bill of materials
Reference designators, zones, VOOHU categories, recommended parts and availability for all 31 positions. Opens directly in Excel.
Datasheet collection
Datasheet PDFs for the VOOHU parts recommended on this board.
Design files & footprint library
Schematic, PCB, and VOOHU part footprints and 3D models.
Coming soonRequest the complete engineering workstation reference design packagefull package
Includes the BOM, datasheets for the recommended VOOHU parts and position-by-position selection notes. If you need selection advice for your port count, speed (2.5G / 10G) or redundancy scheme, include it in your request. We reply within 24 hours on working days.
