Transport / Metro Network Reference Design
An illustrative transport / metro network reference design for the core / transport layer of the five-layer network architecture, built around a box-type SPN / IP RAN device: 12 × GE / 10GE ports (SFP+ 2×6 combo cage), 4 × 25GE ports (SFP28 2×2), 4 × 100GE ring ports (QSFP56 2×2, fitted with QSFP28 modules), 1588v2 / SyncE time synchronization (1PPS + ToD time port + DPLL), a management port, and −48V input converted to an isolated 12V through a planar transformer. 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 GE / 10GE port topology: the TX / RX differential pairs of the forwarding chip's 10G SerDes (SFI; SGMII / 1000Base-X for GE) pass AC-coupling capacitors (fitted as the SerDes requires; SFP modules are already AC-coupled internally) to TD± / RD± of the SFP+ 2×6 combo cage (J1), with control and status lines on I²C / GPIO; the module VccT / VccR are fed from +3V3 through a VOOHU molded inductor and bypass capacitors, one per port. Each differential pair is drawn as a single 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 GE / 10GE optical ports | GE / 10GE SFP+ 2×6 integrated cage + connector | J1 | SFP+ Series | WHSFP16026F033 | VOOHU |
| 02 | A GE / 10GE optical ports | SFP+ supply filter inductors ×12 | L1 L2 L3 L4 L5 L6 | Molded Inductors | WHYTA0420 series | VOOHU |
| 03 | B 25GE / 100GE optical ports | 25GE SFP28 2×2 integrated cage + connector | J2 | SFP28 Series | WHSFP32122F002 | VOOHU |
| 04 | B 25GE / 100GE optical ports | SFP28 supply filter inductors ×4 | L7 L8 | Molded Inductors | WHYTA0420 series | VOOHU |
| 05 | B 25GE / 100GE optical ports | 100GE ring port QSFP56 2×2 integrated cage + connector | J3 | QSFP56 Series | WH81161Y22121 | VOOHU |
| 06 | B 25GE / 100GE optical ports | QSFP supply filter inductors ×4 | L9 L10 | Molded Inductors | WHYTA0420 series | VOOHU |
| 07 | D Forwarding chip | SPN / IP RAN forwarding chip | U1 | — | — | Non-VOOHU |
| 08 | D Forwarding chip | DDR memory | U2 | — | — | Non-VOOHU |
| 09 | D Forwarding chip | 1588 clock IC (DPLL) | U5 | — | — | Non-VOOHU |
| 10 | C Sync / management | 1PPS + ToD time port RJ45 | J4 | RJ45 Connector | WH56A11810011101 | VOOHU |
| 11 | C Sync / management | RS-422 transceiver | U3 | — | — | Non-VOOHU |
| 12 | C Sync / management | Management port RJ45 with integrated magnetics | J5 | RJ45 with Integrated Magnetics | SYT211Q066CD2A4D | VOOHU |
| 13 | C Sync / management | Management port Gigabit PHY | U4 | Ethernet PHY | JL2101C-NI | VOOHU |
| 14 | E −48V power | −48V power input terminals (A / B dual feeds) | J6 | — | — | Non-VOOHU |
| 15 | E −48V power | Bidirectional input TVS | D1 | TVS ESD | WHTB058VA | VOOHU |
| 16 | E −48V power | Input varistor (MOV) | RV1 | MOV | WHM0082VA | VOOHU |
| 17 | E −48V power | Power-line common-mode choke (EMI) | L11 | Power Line Common Mode Chokes | WHAL-9070A-301T0 | VOOHU |
| 18 | E −48V power | Isolated DC-DC controller | U6 | — | — | Non-VOOHU |
| 19 | E −48V power | Planar transformer (48V → 12V isolated) | T1 | Planar Transformers | WHPT-EQ200-025 | VOOHU |
| 20 | E −48V power | Synchronous buck ×2 | U7 U8 | — | — | Non-VOOHU |
| 21 | E −48V power | Molded inductors ×2 (DC-DC) | L12 L13 | Molded Inductors | WHYT0630 Series | VOOHU |
| 22 | E −48V power | Multiphase controller + DrMOS | U9 | — | — | Non-VOOHU |
| 23 | E −48V power | Combined inductors ×2 (multiphase VR) | L14 L15 | Combined Inductors | WHPBU-100710N-R15L0 | VOOHU |
Resources & downloads
Board bill of materials
Reference designators, zones, VOOHU categories, recommended parts and availability for all 23 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 transport / metro network 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 mix (GE / 10GE / 25GE / 100GE), time synchronization interfaces or −48V power scheme, please include it in your requirements. We reply within 24 hours on working days.
