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DAC (Direct Attach Cable) Cable

DAC (Direct Attach Cable) is a copper-based cable used for high-speed data transmission with low latency for short-distance connections between devices without the need for external power source.

Product Details:

DAC Cable contain of:
25G SFP28 to SFP28 DAC
40G QSFP+ to 4*SFP+ DAC
100G QSFP28 to QSFP28 DAC
100G QSFP28 to 4*SFP28 DAC
The transmit distance up to 7~10m
Single 3.3V power supply
Pull-to-release slide latch design
26AWG through 30AWG cable
RoHS compliant
Operating temperature 0 – 70℃


Ordering Information:

Item No. Data Rate Wire AWG Distance Minimum Bend Radius Package Connector Temperature()
10G DAC 10G 30AWG 1~10m 23mm SFP+ DAC 0~70
25G DAC 25G 30AWG 1~10m 25mm SFP28 DAC 0~70
40G DAC 40G 30AWG 1~10m 35mm QSFP+ DAC 0~70
40G DAC Breakout 4*10G 30AWG 1~10m 21mm QSFP+ to 4*SFP+ DAC 0~70
100G DAC 100G 30AWG 1~10m 33mm QSFP28 DAC 0~70
100G DAC Breakout 4*25G 30AWG 1~10m 25mm QSFP28 to 4*SFP28 DAC 0~70


The difference between DAC Cable and AOC Cable:

Feature DAC Cable AOC Cable
Plug and Play Yes Yes
Cable Type Twinax copper Multimode OM3/OM4 fiber
Distance Limited range 0.5 to 15m (recommendation of max 10m) Reaches up to 100m (recommendation of max 30m)
Data Rate Speeds are up to 400G Speeds are up to 400G
Power Consumption Virtually zero. Passive cables <0.3W ~50% of power consumption versus 2 transceivers
Cost Lowest cost point to point solution Much reduced CAPEX versus 2 transceivers and fiber patch cable
Form Factors Supported SFP+/SFP28/QSFP+/QSFP28/QSFP-DD SFP+/SFP28/QSFP+/QSFP28/QSFP-DD
Passive/Active Supports active and passive switch ports Supports active switch ports
EMI Vulnerable to EMI EMI has no impact
Bend Radius AWG 24 to 30 (higher ratings for thinner cable and greater bendability) Thinner and shorter bend radius. Lightweight compared to DACs
Application Top of Rack(ToR)
Adjacent Rack
Top of Rack(ToR)
End of Row(EoR)
Middle of Row(MoR)
Zone to Zone


Brand Compatible

. . .

Please contact us for specific compatible models.

Installing an SFP Transceiver and a fiber-optic cable

Key points of choosing a suitable Optical Transceiver

Form factor & connectors

  • GBIC – Gigabit Interface Converter
  • SFP – Small Form-factor Pluggable
  • SFP+ – Enhanced Small Form-Factor Pluggable
  • QSFP+ – Enhanced Quad Small Form-factor Pluggable
  • QSFP-DD – Quad Small Form-factor Pluggable Double Density
  • SFP-DD – Small Form-factor Pluggable Double Density

Speed / Data Rate

  • 155Mbps 
  • 1Gbps / 2Gbps / 4Gbps / 8Gbps  
  • 10Gbps / 16Gbps 
  • 25Gpbs / 40Gbps
  • 100Gbps / 200Gbps
  • 400Gbps


  • 850nm for short distances (around 500m on multimode fiber)
  • 1310nm for mid-range reach (approximately 40km on singlemode fiber)
  •  1550nm for long to extreme range (beyond 40km on singlemode fiber)

OEM compatibility

  • Cisco / Huawei / Juniper
  • Brocade(Formerly) / Alcatel-Lucent
  • Dell / Extreme / H3C
  • IBM / Nortel / Calix
  • ADTRAN / Allied Telesis
  • Arista Networks / Avaya

Cable Type

  • cable/optical fiber mode (single-mode, multi-mode)
  • 1310/1550 nm = Single Mode (9/125 µm)
  • 850/1300 nm = Multimode (50/125 µm)


  • Commercial transceivers – basic operating temp: 0 – 70° C / 32 – 158° F
  • Industrial transceivers – basic operating temp: -40 – 85° C / -40 – 185° F

Strictly Test After Assembly

Test 1: Average Output Optical Power Detection
Test 2: Extinction Ratio Measurement
Test 3: OMA in a stressed eye diagram of an optical signal
Test 4: Bit Error Rate Test
 Test 5: Eye Pattern Test
Test 6: Wavelength Testing

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