The OSFP1600 Active Loopback is a specialized 1.6 Tb/s (8 × 224G PAM4) test module designed for validating, characterizing, and debugging next-generation OSFP host ports used in AI clusters, Ethernet switches, and high-speed networking equipment. It incorporates an onboard DSP that retimes and conditions signals, enabling testing in situations where passive loopbacks are insufficient due to channel loss. (Multilane)
Key Features
| Feature | Description |
|---|---|
| Form Factors | Available in Type 2 IHS (Integrated Heat Sink) and Type 2 RHS (Riding Heat Sink) shell variants. (Multilane) |
| DSP Options | Available with 5 nm and 3 nm DSP implementations for different performance and power requirements. (Multilane) |
| Data Rate | Supports 1.6T OSFP (224 Gb/s per lane) host testing. (Multilane) |
| CMIS Support | Implements CMIS 5.x, including CDB (Command Data Block), VDM (Vendor Defined Monitoring), and DPSM (Data Path State Machine) functionality. (Multilane) |
| Monitoring Sensors | Integrated temperature, current, and voltage sensing for detailed port characterization. (Multilane) |
| Insertion Tracking | Includes a real insertion counter for lifecycle and reliability monitoring. (Multilane) |
| ThunderBERT Option | Optional integration with ThunderBERT software for BER measurements and instrument-grade diagnostics directly from the module. (Multilane) |
What It Is Used For
- Host-port interoperability validation
- 224G lane signal integrity testing
- Switch ASIC bring-up and characterization
- Baseline performance verification before connecting optics or cables
- Manufacturing and post-production diagnostics
- AI and hyperscale data-center network development (Multilane)
IHS vs RHS Versions
- IHS (Integrated Heat Sink): Fixed heat sink integrated into the module body; commonly used when cooling is provided by the host chassis. (Manuals+)
- RHS (Riding Heat Sink): Heat sink rides with the module and is removed together during extraction; often preferred in high-power deployments. (Manuals+)
Technical Highlights
- OSFP1600-compliant mechanical design
- Angled latch mechanism
- CMIS-managed diagnostics
- Real-time sensor telemetry
- DSP-based retiming architecture
- Designed specifically for emerging 1.6T / 224G ecosystems and AI networking infrastructure. (Multilane)
For engineers developing 224G SerDes switches or AI accelerator platforms, the OSFP1600 Active Loopback effectively acts as a self-contained diagnostic transceiver, allowing detailed port validation without requiring a full optical link. (Multilane)
For more details, see MultiLane OSFP1600 Active Loopbacks.
