24-Port Gigabit L2 Managed Access Switch Reference Design
An illustrative reference design for a 24-port Gigabit L2 managed access switch at the access layer of the five-layer network architecture: 24 Gigabit copper ports (3 octal PHYs + two 2×6 RJ45s with integrated magnetics), 4 × 10G SFP+ optical uplinks, an out-of-band MGMT port and a Console port, with a 12V supply. 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 SFP+ uplink topology: the transmit / receive pairs of the switch SoC's 10G SerDes (SFI) connect through AC-coupling capacitors (fitted as the SerDes requires; the module is already AC-coupled internally) to TD± / RD± of the SFP+ 20pin host connector (per SFF-8431 MSA), and the control and status lines (I²C, TX_DISABLE, MOD_ABS, RX_LOS) go to the SoC's I²C / GPIO; each module's VccT / VccR are filtered from +3V3 by a VOOHU molded inductor and bypass capacitors, one per port. J1 is shown; J2–J4 are identical. Each pair is drawn as 1 line; coupling capacitors and pull-ups are drawn as symbols without values.
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 Optical uplinks | SFP+ uplink ports ×4 (1×4 ganged cage + 20-pin connector) | J1 J2 J3 J4 | SFP Cage / SFP Connectors | WH81-114-Y0006-1 | VOOHU |
| 02 | A Optical uplinks | SFP+ power filter inductors ×4 | L1 L2 L3 L4 | Molded Inductors | WHYTA0420 series | VOOHU |
| 03 | B Gigabit copper ports | ICM RJ45 2×6 ×2 (GE1–24) | J5 J6 | RJ45 with Integrated Magnetics | SYT26Q042DB2A4D068 | VOOHU |
| 04 | C 8-port PHY | 8-port Gigabit PHY ×3 | U2 U3 U4 | Ethernet PHY | JL2388-PC | VOOHU |
| 05 | C 8-port PHY | 25MHz crystals ×3 | Y1 Y2 Y3 | — | — | Non-VOOHU |
| 06 | D Switch SoC | Layer 2 managed switch SoC (24GE + 4 × 10G) | U1 | — | — | Non-VOOHU |
| 07 | D Switch SoC | DDR memory | U5 | — | — | Non-VOOHU |
| 08 | D Switch SoC | SPI Flash | U6 | — | — | Non-VOOHU |
| 09 | E Management | MGMT RJ45 with integrated magnetics (out-of-band management port) | J7 | RJ45 with Integrated Magnetics | SYT211Q066CD2A4D | VOOHU |
| 10 | E Management | Management port Gigabit PHY | U7 | Ethernet PHY | JL2101C-NC | VOOHU |
| 11 | E Management | Console RJ45 | J8 | RJ45 Connector | WH56A11810011101 | VOOHU |
| 12 | E Management | RS-232 level shifter | U8 | — | — | Non-VOOHU |
| 13 | F Power | 12V power input | J9 | — | — | Non-VOOHU |
| 14 | F Power | Input TVS | D1 | — | — | Non-VOOHU |
| 15 | F Power | Power-line common-mode choke (EMI) | L5 | Power Line Common Mode Chokes | WHACM07A40R501 | VOOHU |
| 16 | F Power | Synchronous bucks ×3 | U9 U10 U11 | — | — | Non-VOOHU |
| 17 | F Power | Molded inductors ×3 (DC-DC) | L6 L7 L8 | Molded Inductors | WHYT0630 Series | VOOHU |
Resources & downloads
Board bill of materials
Reference designators, zones, VOOHU categories, recommended parts and availability for all 17 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 24-Port gigabit L2 managed access switch reference design full package
Includes the full-board position list, datasheets for the recommended VOOHU parts and position-by-position selection notes. For advice tailored to your port count, uplink speed or magnetics option (integrated RJ45 / discrete transformer), describe it in your requirements. We reply within 24 hours on business days.
