High Speed Cables

What is the difference between AOC and DAC cable?

Difference between AOC cable and DAC cable

AOC active cables and DAC high-speed cables are used for short-distance server interconnection and server-switch interconnection in data centers, what is AOC, what is DAC, and what are the differences between them?

What is AOC (Active Optical Cable)?

Application:

AOC is composed of integrated optoelectronic devices, applies to high-speed and high-reliability interconnection transmission equipment between data centers, high-performance computers, large-capacity storage devices, etc. It usually meets industrial standard electrical interfaces, Optical-to-electrical conversion, and uses the advantages of optical cables for data transmission.

Structure:

Two optical transceiver+optical jumper=Active optical cable

Classification:

SFP+ to SFP+/SFP28 to SFP28 AOC cable

AOC cable

 

QSFP+ to QSFP+/QSFP28 to QSFP28 AOC cable

AOC cable

QSFP+ to 4*SFP+ AOC cable

AOC cable

AOC cables normally has 3, 5, 7, 10, 20, 30 meters, SFP-10G-AOC3M, SFP-10G-AOC5M, SFP-25G-AOC-10M

What is DAC (Direct Attach Cable)?

High-speed cable, or direct attach copper cable, its port is non-replaceable, and the module head and copper cable cannot be separated.

Application:

DAC cable normally applies to the switches in the data center, it can be active or passive, while AOC cable only can be active.

Appearance:

SFP+ to SFP+ or SFP28 to SFP28 high-speed cable

DAC cable

QSFP+ to QSFP+ or QSFP28 to QSFP28 high-speed cable

DAC cable

QSFP+ to 4*SFP+ or QSFP28 to 4*SFP28 high-speed cable

DAC cable

Structures:

SFP+ to SFP+ or SFP28 to SFP28 high-speed cable

DAC cable Structure

QSFP+ to QSFP+ or QSFP28 to QSFP28 high-speed cable

DAC cable Structure

QSFP+ to 4*SFP+ or QSFP28 to 4*SFP28 high-speed cable

DAC cable Structure

 

DAC cables normally has 1, 3, 5, 7, 10 meters.

 

AOC Cable vs DAC Cable

1, AOC MAX power consumption is lower than DAC high-speed cable

2, AOC transmit distance is longer than DAC, AOC (OM3) can reach 100M, DAC only transmit 10M

3, AOC is made of optical fiber material (insulation), which belongs to optical fiber communication and is not interfered by electromagnetic waves. DAC is made of copper wire, which belongs to electrical communication and will be subject to electromagnetic interference.

4, AOC is more expensive than DAC cable. Material of AOC cable is fiber, and there includes laser device in the two transceivers; DAC is copper, does not include laser.

5, AOC transmits optical signals, DAC transmits low voltage pulse signal.

6, At same length, AOC is 1/4 weight of DAC cable, and 1/2 volume of DAC, convenient for wiring and delivery.

Contrast Item AOC DAC
Transmit signal Optical signal Low voltage pulse signal
Transmission medium Optical fiber Copper
Laser Yes No
MAX consumption AOC<DAC
Transmission distance AOC>DAC
Price AOC>DAC
Weight and volume AOC<DAC
Performance AOC>DAC
Bending radius AOC<DAC

 

Conclusion: AOC and DAC have their own advantage and disadvantage, you can choose them according to real and actual application environment. If you want to know more about these cables, please contact Fiberolt.com.

Leave a Reply

Your email address will not be published. Required fields are marked *

38 − 37 =