Copper Twinax Direct Attach Cable QSFP28 To QSFP28 For Storage Area Networks

Basic Information
Place of Origin: Shenzhen, China
Brand Name: Gigaopto
Certification: CE,FCC,RoHs, TUV,UL
Model Number: GD-QSFP28-0P5M
Minimum Order Quantity: 1
Price: negotiable
Packaging Details: Static bag, Plastic bag, Retail box or by required
Delivery Time: 1-5 work days
Payment Terms: T/T, L/C
Supply Ability: 50,000pcs/month
Detail Information
Product Name: 100G DAC Data Rata: 100G
Temperature: 0~70 °C Cable: Passive Twinax
Connector: QSFP28 To QSFP28 Warranty: 3-Year
Keywords: 100G QSFP28 Direct Attach Cable
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Copper Twinax Direct Attach Cable


Copper Direct Attach Cable


Twinax DAC Cable

Product Description

100 Gigabit Direct Attach Twinax Copper Cable Assembly Up to 5m Transmission



  • Up to 5m transmission
  • Hot-pluggable QSFP28 38 PIN footprint
  • I2C based two-wire serial interface for EEPROM signature which can be customized
  • Temperature Range: 0~ 70 °C
  • Compatible to SFF-8665
  • Compliant with IEEE 802.3bj
  • Single 3.3V power supply
  • Low crosstalk
  • RoHS compliant
  • Data rate up to 103.125Gbps
  • 4-Channel Full-Duplex Passive Copper Cable Transceiver,25.78Gb/s per channel

Applications of 100G QSFP28 Direct Attach Cable

  • Telecommunication and wireless infrastructure
  • High performance computing
  • Low EMI radiation switches, servers and routers
  • Medical diagnostics and networking
  • Test and measurement equipment
  • Storage area networks
  • Data center networks


Functional Specification


Product Name QSFP28 DAC PCC Max Data Rate 103.125Gbps (4x 25.78Gbps)
Passive or Active Passive Cable Length 0.5M to 5M
Connector QSFP28 to QSFP28 Cable impedance 100 Ω
Wire Gauge AWG 30AWG:Length 0.5M/1M/2M/3M; 26AWG:Length 4M/5M
Minimum Bend Radius 33mm: Length 0.5M/1M; 46mm: Length 2M/3M/4M/5M
Cable type twinax copper Power supply 3.3V
Jacket Material PVC (OFNR) Environment Operating:0 to 70°C (32 to 158°F)
Power Consumption ≤0.5W HTS-Harmonized Code (US) 8517.62.0090
Warranty 3-Year OEM/ODM Supported
Protocols IEEE 802.3bj 100GEBASE-CR4,QSFP28 MSA, SFF-8665, InfiniBand HDR





This QSFP28 to QSFP28 direct attach cable is a high-speed, cost effective alternative that supports to establish a 100-Gigabit link between QSFP-100G ports of switches within racks and across adjacent racks with a maximum reach of 5-meter.

The 100G QSFP28 Passive direct attach cable contains 8 high-speed copper pairs, each operating at data rates of up to 25Gb/s. Each QSFP28 port comprises an EEPROM providing product information, which can be read by the host system.

It has been programmed, uniquely serialized, and data-traffic and application tested to ensure it is 100% compliant and functional.

This Direct Attach Copper is compliant with IEEE 802.3, SFF-8665, and QSFP28 MSA standards.



Ordering Information


Part Number Description Wire Gauge (AWG) Minimum Bend Radius
GD-QSFP28-0P5M 100G QSFP28 to QSFP28 DAC Cable 0.5-meter, Passive 30AWG 33mm
GD-QSFP28-1M 100G QSFP28 to QSFP28 DAC Cable 1-meter, Passive 30AWG 33mm
GD-QSFP28-1P5M 100G QSFP28 to QSFP28 DAC Cable 1.5-meter, Passive 30AWG 46mm
GD-QSFP28-2M 100G QSFP28 to QSFP28 DAC Cable 2-meter, Passive 30AWG 46mm
GD-QSFP28-2P5M 100G QSFP28 to QSFP28 DAC Cable 2.5-meter, Passive 30AWG 46mm
GD-QSFP28-3M 100G QSFP28 to QSFP28 DAC Cable 3-meter, Passive 30AWG 46mm
GD-QSFP28-5M 100G QSFP28 to QSFP28 DAC Cable 5-meter, Passive 26AWG 46mm
Note 1. Customized 100G QSFP28 high speed copper cables are available in various lengths.                2. The Wire Gauge is available in AWG24, AWG26, AWG28, and AWG30 for customized need.



High Speed Specifications
















Differential Impedance RIN, P 9 100 110 Ώ  
Insertion loss SDD21 8   22.48 dB At 12.8906 GHz
Differential Return Loss



12.45   See 1 dB At 0.05 to 4.1 GHz
3.12   See 2 At 4.1 to 19 GHz
Common-mode to common- mode output return loss



2     dB At 0.2 to 19 GHz
Differential to common-mode return loss



12   See 3 dB At 0.01 to12.89 GHz
10.58   See 4 At 12.89 to19 GHz
Differential to common Mode Conversion Loss SCD21-IL 10     dB At 0.01 to12.89 GHz
    See 5 At 12.89 to15.7 GHz
6.3     At 15.7 to 19 GHz
Channel Operating Margin COM 3     dB




  1. Reflection Coefficient given by equation SDD11(d B) < 16.5 - 2 × SQRT(f ), with finGHz.
  2. Reflection Coefficient given by equation SDD11(dB) < 10.66 - 14 × log10(f/5.5), with finGHz.
  3. Reflection Coefficient given by equation SCD11(d B) < 22 - (20/25.78)*f, with finGHz.
  4. Reflection Coefficient given by equation SCD11(dB) < 15 - (6/25.78)*f, with finGHz.
  5. Reflection Coefficient given by equation SCD21(dB) < 27 - (29/22)*f, with finGHz.




All Gigaopto DAC are standards-based and MSA (Multi-Source Agreement) compliant, and rigorously tested and coded in our own facilities to ensure the highest level of performance. We conduct 100% application testing under end-use conditions.

For this 100GBASE QSFP28 to QSFP28 100G Passive Direct-Attach-Cables, please refer to the P/N correspondence table (Fox example in 1M length). For more product compatibility, please feel free to tell us.


Corresponding Compatible Brand/Part Number
Brand Part Number Brand Part Number
Gigaopto GD-QSFP28-1M Arista CAB-Q-Q-100G-1M
Cisco QSFP-100G-CU1M Juniper QFX-QSFP28-DAC-1M
Dell DAC-Q28-100G-1M Brocade 100G-Q28-Q28-C-0101
Mellanox MCP1600-C001 HW QSFP-100G-CU1M
Extreme 10411    


Contact Details

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