PoE-Powered 10/100 IP Phone Reference Design
An illustrative PoE-powered 10/100 IP phone reference design for the terminal layer (enterprise terminals) of the five-layer network architecture: dual LAN / PC ports (a built-in 3-port switch IC provides PC pass-through), 802.3af power drawn from the LAN port with a PD flyback producing 5V, and an RJ11 handset port. 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 LAN port topology: the SoC's RMII connects to the 10/100 3-port switch IC JL5104; the MDI pairs of switch port 0 pass ESD D1 into the 10/100 PoE LAN transformer T1 (with a common-mode choke on the PHY side), then to the left port of the 1×2 RJ45 J1. The cable-side center taps go one way to chassis ground through 75Ω×2 + 1nF/2kV and the other way to rectifier bridge DB1 for PoE power (see the "PoE PD input" tab); the PHY-side center taps go to ground through 0.1µF. 10/100 uses only the TX / RX pairs and only 1 pair is drawn; series resistors and decoupling are not drawn.
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 LAN / PC ports | Plain RJ45 1×2 (LAN / PC) | J1 | RJ45 Connector | WH56I3288RGGG0121101 | VOOHU |
| 02 | A LAN / PC ports | 10/100 PoE LAN xfmr (LAN) | T1 | 10/100 LAN Transformers | WHS16002-1PTG | VOOHU |
| 03 | A LAN / PC ports | 10/100 LAN transformer (PC port) | T2 | 10/100 LAN Transformers | WHS16037TG | VOOHU |
| 04 | A LAN / PC ports | Ethernet ESD array ×2 | D1 D2 | TVS ESD | WHALD03G4U | VOOHU |
| 05 | B Switch IC | 3-port 10/100 switch IC | U2 | Ethernet Switch | JL5104C-NC | VOOHU |
| 06 | B Switch IC | 25MHz crystal | Y1 | — | — | Non-VOOHU |
| 07 | C SoC / display | VoIP SoC | U1 | — | — | Non-VOOHU |
| 08 | C SoC / display | DDR + SPI Flash | U5 U6 | — | — | Non-VOOHU |
| 09 | C SoC / display | LCD / keypad FPC connector | J3 | — | — | Non-VOOHU |
| 10 | D Handset | RJ11 handset port | J2 | RJ11 Connectors | SYT55211144IWA1DY1017 | VOOHU |
| 11 | D Handset | Handset port ESD array | D3 | TVS ESD | WHTA5V01P2C | VOOHU |
| 12 | D Handset | Audio codec + amplifier | U4 | — | — | Non-VOOHU |
| 13 | E PoE PD input / power | PoE rectifier bridge | DB1 | — | — | Non-VOOHU |
| 14 | E PoE PD input / power | PD input TVS | D4 | TVS ESD | WHTB058VA | VOOHU |
| 15 | E PoE PD input / power | PD controller + flyback | U7 | — | — | Non-VOOHU |
| 16 | E PoE PD input / power | PoE power transformer (PD flyback) | T3 | PoE Power Transformers | WH13P-50L | VOOHU |
| 17 | E PoE PD input / power | Buck converters ×2 (5V→3.3V / 1.2V) | U8 U9 | — | — | Non-VOOHU |
| 18 | E PoE PD input / power | Molded inductors ×2 (DC-DC) | L1 L2 | Molded Inductors | WHYTA0420 series | 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 PoE-Powered 10/100 IP phone 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 tailored to your port speed (10/100 / Gigabit), PoE class or handset / headset interface, describe it in the requirements field. We reply within 24 hours on business days.
