Aggregation Switch Reference Design
An illustrative aggregation switch reference design for the aggregation / edge layer of the five-layer network architecture: 24 × 10G / 25G SFP28 downlink ports (two SFP28 2×6 cage + connector assemblies), 4 × 100G uplink / stacking ports (QSFP56 2×2 cage + connector assembly, fitted with QSFP28 modules), out-of-band MGMT and Console ports, dual hot-swap 12V power, and the switch SoC core supplied by a multiphase VR with combined inductors. Each position is marked with the VOOHU parts available, recommended part numbers and package pinouts.
Illustrative PCB ⇄ Schematic
Illustrative top-side view arranged by functional zone (not the actual layout). Red numbered dots mark positions VOOHU can supply. Click a component on the board, an entry in the index below or a part in the schematic to see recommended parts and package pinouts on the right.
Illustrative downlink port topology: the switch SoC's 25G SerDes (SFI at 10G) transmit / receive pairs connect through AC-coupling capacitors (fitted as the SerDes requires; SFP28 modules are AC-coupled internally) to TD± / RD± of the SFP28 2×6 cage + connector assembly, and the control and status lines reach the SoC through an I²C multiplexer; each module's VccT / VccR are filtered from +3V3 by a VOOHU molded inductor and bypass capacitors, one per port. Each pair is drawn as one line.
Board bill of materials
Summarized by position; click any row to locate it on the board above.
| No. | Zone | Position | Ref. | VOOHU category | Recommended part | Availability |
|---|---|---|---|---|---|---|
| 01 | A Downlink optical ports | Downlink SFP28 2×6 integrated cage + connector ×2 | J1 J2 | SFP28 Series | WHSFP32126F002 | VOOHU |
| 02 | A Downlink optical ports | SFP28 supply filter inductors ×24 | L1 L2 L3 L4 L5 L6 L7 L8 L9 L10 L11 L12 | Molded Inductors | WHYTA0420 series | VOOHU |
| 03 | B Uplink / stacking | Uplink / stacking QSFP56 2×2 integrated cage + connector | J3 | QSFP56 Series | WH81161Y22121 | VOOHU |
| 04 | B Uplink / stacking | QSFP supply filter inductors ×4 | L13 | Molded Inductors | WHYTA0420 series | VOOHU |
| 05 | D Switch SoC | Layer 3 switch SoC (24 × 25G + 4 × 100G) | U1 | — | — | Non-VOOHU |
| 06 | D Switch SoC | DDR memory | U2 | — | — | Non-VOOHU |
| 07 | D Switch SoC | Flash | U3 | — | — | Non-VOOHU |
| 08 | C Management | MGMT RJ45 with integrated magnetics (out-of-band management port) | J4 | RJ45 with Integrated Magnetics | SYT211Q066CD2A4D | VOOHU |
| 09 | C Management | Management port Gigabit PHY | U4 | Ethernet PHY | JL2101C-NC | VOOHU |
| 10 | C Management | Console RJ45 | J5 | RJ45 Connector | WH56A11810011101 | VOOHU |
| 11 | C Management | RS-232 level shifter | U5 | — | — | Non-VOOHU |
| 12 | E 12V power | Power module interface (12V · dual hot-swap) | J6 | — | — | Non-VOOHU |
| 13 | E 12V power | Input TVS | D1 | — | — | Non-VOOHU |
| 14 | E 12V power | High-current power-line common-mode choke (EMI) | L14 | Power Line Common Mode Chokes | WHAL-1513A-301T0 | VOOHU |
| 15 | E 12V power | Synchronous buck ×2 | U6 U7 | — | — | Non-VOOHU |
| 16 | E 12V power | Molded inductors ×2 (DC-DC) | L15 L16 | Molded Inductors | WHYT0630 Series | VOOHU |
| 17 | E 12V power | Multiphase controller + DrMOS | U8 | — | — | Non-VOOHU |
| 18 | E 12V power | Combined inductors ×2 (multiphase VR) | L17 L18 | Combined Inductors | WHPBU-131308N-R11K0 | VOOHU |
Resources & downloads
Board bill of materials
Reference designators, zones, VOOHU categories, recommended parts and availability for all 18 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 aggregation switch reference design full package
Includes the full-board position list, datasheets for the recommended VOOHU parts and position-by-position selection notes. For selection advice on your port plan (SFP+ / SFP28 / QSFP28 counts and layout), cage LED and cooling options or power scheme, describe them in your requirements. We reply within 24 hours on business days.
