Description

This Farsince breakout assembly converts one QSFP28 port into four independent SFP28 connections passive twinax harness. The cable integrates a hot‑pluggable QSFP28 plug on the switch side and four SFP28 plugs on the device side, each carrying a 25G NRZ lane for an aggregate 100 Gbps. It is designed for short‑reach fan‑out in leaf/spine architectures, top‑of‑rack switch‑to‑server links, storage interconnects, and equipment‑room patching where 100G ports must be distributed to multiple 25G endpoints.

The passive design eliminates optics and active components, delivering near‑zero latency and very low power draw while maintaining signal integrity through controlled‑impedance copper and robust shielding. A 60 mm minimum bend radius supports tidy routing in dense racks, and pull‑tab latches enable quick, tool‑free service. The cable is hot‑pluggable and interoperable with platforms that follow QSFP28/SFP28 MSA and IEEE 802.3 electrical specifications. Farsince supports vendor‑specific coding, length and labeling options, and provides batch test reports to align with data‑center deployment and maintenance practices.

Specifications

• Product Type: 100G to 4×25G Passive Direct Attach Copper Breakout
• Host Interface: QSFP28 (4×25G NRZ)
• Device Interface: 4× SFP28 (25G NRZ each)
• Cable Direction: QSFP28 to 4× SFP28
• Aggregate Data Rate: 100 Gbps (4×25 Gbps)
• Wire Gauge: 30 AWG
• Cable Structure: Shielded twinax harness, passive
• Minimum Bend Radius: 60 mm
• Power Consumption: ≤0.125 W (host 3.3 V for ID)
• Jacket Material: PVC (OFNR)
• Operating Temperature: 0 to +70°C
• Installation: Hot‑pluggable connectors with pull‑tab latches
• Compatibility: IEEE 802.3; QSFP28 MSA (SFF‑8665); SFP28 MSA (SFF‑8402)
• Compliance: RoHS, REACH
• Customization: Vendor coding, length and labeling options; test reports