QSFP28 Active DAC Cable

Volex’s QSFP28 active Direct Attach Copper cable features 4 transmitting and 4 receiving 25Gbps NRZ channels. The cable assembly meets 25G and 100G Ethernet and InfiniBand EDR standards. The Volex QSFP28 active DAC enhances Signal Integrity, which is severely stressed under high-speed data transmission, through advanced linear equalization. The result is longer reach up to 9M vs 5M for the passive version and smallest cable size and highest flexibility. Also, IEEE CA-25G-N spec can be met for full in-rack cabling length to support no FEC for low latency application.

As next-gen data centres deploy faster speed in a tighter space, they need high performance cables that reduce power consumption, provide reliable operation and are low cost. The Volex QSFP56 active DAC is designed to meet the next-gen data centre needs and is a cost-effective alternative to the high-power consumption Active Optical Cable.

QSFP28 Active DAC Cable Product Highlights

  • Low power consumption and heat dissipation
  • Complete cable assembly uniquely terminated at the factory to provide the most reliable operation
  • 100% tested for signal integrity with serial number traceability

QSFP28 Active DAC Cable Features and Specifications

Product Type QSFP28 to QSFP28 active direct attach copper cable
Conductor Treatment Laser stripped conductors
Cable Type High-speed twinax cable, 8-pair differential, 100 +/-5 ohms
Cable Colour Black
Cable Jacket PVC
Packaging PE bag
Power Supply Voltage 3.3V
Power Consumption <150mW per active channel
Temperature Range 0 – 70o C
Retention Force Minimum 125N per SFF-8661
Insertion Force Maximum 60N per SFF-8661
EEPROM Each connector module contains an EEPROM to provide product information to the host system
Cable Termination 100% factory tested including comprehensive signal integrity verification and serial number traceability using advanced Manufacturing Execution Systems
Volex reserves the right to change specifications and availability without prior notice.

QSFP28 Active DAC Cable Applications

  • Switches, Servers, Routers, Storage Arrays
  • Networking Equipment
  • Data Centres
  • Telecom Central Offices (CO)
  • Test and Measurement Equipment

Standards Compliance of QSFP28 Active DAC Cable

  • IEEE P802.3bj, IEEE 802.3by
  • InfiniBand EDR
  • SFF-8665, SFF-8661, SFF-8679, SFF-8636
  • EIA-364
  • UL 94, 1581, VW1, File No. E510564
  • RoHS

QSFP28 Active DAC Cable Mechanical Drawings

QSFP28 Active DAC Cable Product Dimensions

Volex P/N

Cable Length
Cable Gauge

Cable OD


4.00 30 7.0
DA40PSG50BA 5.00 30



5.00 28 8.5
DA48PSG60BA 6.00 28



7.00 28 8.5
DA48PSG70BA 7.00 26



8.00 26 9.5
DA46PSG90BA 9.00 26


4-9m lengths available with 26-30 AWG conductor sizes to achieve maximum performance. Options Available:

  • Low Smoke, Zero Halogen (LSZH) jackets
  • Custom colours for pull tab
  • Custom EEPROM mapping

Contact Volex for QSFP28 Active DAC Cable

Contact Volex for further assistance with external QSFP28 active direct attach copper cable.