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40G QSFP+ Transceivers Product Detail

40G QSFP+ to 4xSFP+ Breakout DAC

40G QSFP+ to 4xSFP+ Breakout DAC is a passive twinax direct-attach cable for in-rack and adjacent-rack direct interconnects, with length and compatibility defined by the ordered version.

Product specification information

Use the published model direction and key parameters for selection and sample planning. Confirm compatibility coding, optional temperature grade, and production parameters in the formal specification or order document.

Product family
40G Breakout DAC
Optical interface
QSFP+ to 4xSFP+
Typical reach
Custom length
Transmission medium
Passive Twinax Copper Cable
QSFP+4xSFP+DAC40G Breakout DAC
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40G QSFP+ to 4xSFP+ Breakout DAC form-factor illustration

Specs & Features

Features and specifications

For the latest specification and samples, contact sales@staricatech.com.

Product overview

40G QSFP+ to 4xSFP+ Breakout DAC integrates both host ends and the cable assembly for fixed short-reach deployment. Confirm the exact length, both host models, port mode, FEC, routing space, temperature, compatibility coding and delivery version before ordering.

  • 40G Breakout DAC form factor for the defined host-port direction.

  • QSFP+ to 4xSFP+ interface for Custom length links.

  • Passive Twinax direct-attach cable; confirm the exact fiber or cable assembly before ordering.

  • Validate host coding, FEC, diagnostics, power, thermal behavior and long-duration stability.

Selection and deployment notes

  • Before ordering 40G QSFP+ to 4xSFP+ Breakout DAC, confirm the exact host, software, port mode, reach, fiber or cable, connector, FEC, temperature, quantity, compatibility coding and delivery version.

Selection FAQ

40G QSFP+ to 4xSFP+ Breakout DAC selection questions

Does 40G QSFP+ to 4xSFP+ Breakout DAC need FEC enabled on the host?

40G QSFP+ to 4xSFP+ Breakout DAC is a passive Twinax assembly with no retimer, so FEC and lane mode are decided entirely by the source and branch QSFP+ host ports. Confirm the FEC mode the target platform expects before ordering, because a passive cable cannot compensate for a host that assumes a retimed link.

What limits the usable length of 40G QSFP+ to 4xSFP+ Breakout DAC?

Insertion loss across the Twinax pairs, the wire gauge of the ordered P/N and the equalization budget of each QSFP+ port it plugs into. 40G QSFP+ to 4xSFP+ Breakout DAC is built to a fixed length and cannot be trimmed on site, so order it against the measured cable path rather than a nominal rack distance.

What do I need to specify to request a quote for 40G QSFP+ to 4xSFP+ Breakout DAC?

Give the host vendor, model and software version at both ends, the QSFP+ port or lane mode, the operating temperature range, the quantity per site and the target delivery date. For 40G QSFP+ to 4xSFP+ Breakout DAC also state the exact length per link and the routing path it has to follow. Compatibility is confirmed per platform, so the host details matter as much as the optical specification.