OTN / DWDM Optical Transport Reference Design
An illustrative OTN / DWDM optical transport reference design for the core / transport layer of the five-layer network architecture, centered on the multiplexing / forwarding (Muxponder) board: 4 × 100G client-side ports (QSFP56 2×2 cage + connector assembly) are mapped and multiplexed by the OTN processor onto 2 × 400G coherent line-side ports (single-port QSFP-DD cages fitted with 400G ZR / ZR+ tunable modules), each 400G wavelength entering an 80-channel DWDM system; plus an OSC optical supervisory port and a network management port, with 12V from the backplane. 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 client-side topology: the OTN chip's 100GE client side runs 4 × 25G SerDes (CAUI-4) through AC-coupling capacitors (fitted as the SerDes requires; the modules are AC-coupled internally) to the host connector of the QSFP56 cage + connector assembly (J1), fitted with QSFP28 100G modules; management signals and I²C go to the management CPU, and each module's 3.3V is filtered by a VOOHU molded inductor, one per port. The 4 pairs are 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 Client side 100G | Client-side QSFP56 2×2 integrated cage + connector | J1 | QSFP56 Series | WH81161Y22121 | VOOHU |
| 02 | A Client side 100G | Client-side module supply inductors ×4 | L1 L2 | Molded Inductors | WHYTA0420 series | VOOHU |
| 03 | B Line side 400G | Line-side QSFP-DD cage + connector ×2 (400G coherent) | J2 J3 | QSFPDD Series | WH81161Y00471 | VOOHU |
| 04 | B Line side 400G | Coherent module supply inductors ×2 | L3 L4 | Molded Inductors | WHYT0630 Series | VOOHU |
| 05 | C OSC / management | OSC optical monitoring port SFP+ cage + connector | J4 | SFP+ Series | WH81-111-Y0017-1 | VOOHU |
| 06 | C OSC / management | OSC module supply inductor | L5 | Molded Inductors | WHYTA0420 series | VOOHU |
| 07 | D OTN processing | OTN processing chip (framing / mapping / cross-connect) | U1 | — | — | Non-VOOHU |
| 08 | D OTN processing | DDR memory | U2 | — | — | Non-VOOHU |
| 09 | D OTN processing | Clock IC (DPLL) | U3 | — | — | Non-VOOHU |
| 10 | C OSC / management | Management port RJ45 with integrated magnetics | J5 | RJ45 with Integrated Magnetics | SYT211Q066CD2A4D | VOOHU |
| 11 | C OSC / management | Management port Gigabit PHY | U4 | Ethernet PHY | JL2101C-NI | VOOHU |
| 12 | E 12V power | Backplane 12V power + 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) | L6 | Power Line Common Mode Chokes | WHAL-1513A-301T0 | VOOHU |
| 15 | E 12V power | Synchronous buck ×2 | U5 U6 | — | — | Non-VOOHU |
| 16 | E 12V power | Molded inductors ×2 (DC-DC) | L7 L8 | Molded Inductors | WHYT0630 Series | VOOHU |
| 17 | E 12V power | Multiphase controller + DrMOS | U7 | — | — | Non-VOOHU |
| 18 | E 12V power | Combined inductors ×2 (multiphase VR) | L9 L10 | Combined Inductors | WHPBU-100710N-R15L0 | 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 OTN / DWDM optical transport reference design full package
Includes the full-board position list, datasheets for the recommended VOOHU parts and position-by-position selection notes. For cage and cooling selection advice on your client-side / line-side port types (QSFP28 / QSFP-DD / CFP2) and module power, describe them in your requirements. We reply within 24 hours on business days.
