200G QSFP-DD to 8×25G SFP28 Passive DAC Breakout Cable: 200G-PDAC-QSFP-DD-8SFP28

Our EDGEOPTIC 200G-PDAC-QSFP-DD-8SFP28 is a multi-vendor compatible 200G QSFP-DD to 8x 25G SFP28 passive direct attach copper breakout cable designed for ultra-high-performance 25/200 Gigabit Ethernet aggregation applications within modern data center and cloud server environments. The 200G-PDAC-QSFP-DD-8SFP28 cable features a 1-to-8 breakout configuration with a single QSFP-DD connector on the host end and eight independent SFP28 connectors on the multi-port end, delivering reliable high-bandwidth connectivity for 200G-to-8x25G interconnects between high-density ToR switches, aggregation layers, and 25G-equipped servers, NICs, and storage endpoints.

The cable routes each of the eight 25 Gbps NRZ lanes on the 200G QSFP-DD host port to a dedicated SFP28 endpoint, providing a clean 8:1 fan-out from a single 200G port to eight independent 25G channels. The cable supports 8×25G NRZ operation, accommodating the demanding bandwidth requirements of contemporary data center architectures. The SFP28 connector shares the same physical form factor as SFP+ and supports the 25G Ethernet standard, delivering error-free 25 Gbps transmission per channel for high-density 25G Ethernet switch and server connectivity. For Ethernet deployments, the cable enables a 200GbE QSFP-DD switch port to terminate into eight 25GbE SFP28 endpoints, providing a cost-effective solution for enterprises upgrading server fleets from 10G to 25G connectivity without exhausting dedicated SFP28 switch ports.

As a passive DAC solution, the 200G-PDAC-QSFP-DD-8SFP28 requires no external power and introduces zero latency to signal transmission, making it the preferred choice for latency-sensitive applications such as financial trading platforms, real-time analytics, and tightly coupled HPC workloads. The cable construction utilizes high-quality twinax copper with optimized wire gauges for each length range: AWG30 for 0.5 to 2 meters and AWG28 for 3 meters. This wire gauge selection ensures optimal signal integrity at 25 Gbps NRZ per lane while maintaining practical cable flexibility for installation in high-density 8-way breakout deployments.

The electrical interface conforms to QSFP-DD MSA, SFF-8636, and SFF-8402 specifications, ensuring broad compatibility with standard QSFP-DD and SFP28 host systems from multiple equipment vendors. Our 200G QSFP-DD to 8x25G SFP28 DAC breakout cables can be encoded for compatibility with over 80 different equipment brands including major networking, server, and storage vendors. The cable incorporates an I2C two-wire interface for DDM/DOM (Digital Diagnostic Monitoring) functionality, providing real-time diagnostic data including module temperature and supply voltage through the MSA-compatible interface for proactive network monitoring.

Standards compliance includes IEEE 802.3bj and IEEE 802.3cd specifications. The cable supports hot pluggability and is engineered with low crosstalk and optimized return loss characteristics for excellent signal integrity across all eight differential pairs. The cable operates within a 0 to 70°C temperature range, suitable for controlled data center environments. With an MTBF rating of 1,000,000 hours, the cable delivers long-term reliability for mission-critical 200G breakout infrastructure deployments.

Typical deployment scenarios include 200G ToR-to-25G server fan-out, leaf switch-to-server connectivity for dense 25G NIC deployments, cost-effective migration from 10G to 25G server fleets, and 8:1 port density expansion in space-constrained switch deployments. The 8-way breakout architecture delivers maximum port density gain on 200G-capable QSFP-DD switches when connecting to 25G SFP28 endpoints, dramatically reducing per-port cost, slashing rack-level cable count, and freeing dedicated 25G SFP28 switch ports for other uses.

Our 200G QSFP-DD to 8x25G SFP28 passive DAC is CE/RoHS certified and compliant with product safety standards. Because our focus is providing top quality service, we perform comprehensive quality checks before delivery including electrical parameter measurements, connector inspection tests, and QSFP-DD/SFP28 EEPROM memory data validation tests.