DAC & AOC Cables

Build fast, reliable switch, server, storage, and data-center connections with Direct Attach Copper and Active Optical Cables from Hummingbird Networks. Shop DAC and AOC cables for 10G, 25G, 40G, 50G, 100G, and other high-speed network applications using SFP+, SFP28, SFP56, QSFP+, QSFP28, and related pluggable interfaces.

DAC and AOC cables combine the cable and pluggable network interfaces into a single factory-assembled connection. This can simplify short- and medium-distance high-speed networking by eliminating the need to purchase separate transceivers and patch cables for each end of a supported link.

Hummingbird Networks offers direct-attach connectivity from Cisco, HPE, Ubiquiti, Hummingbird Networks compatible solutions, and other leading networking manufacturers for switches, servers, storage systems, data centers, enterprise networks, and high-performance computing environments.

DAC & AOC Cables for High-Speed Networking

Direct-attach cables are commonly used for short and medium-distance connections between high-speed network devices.

Applications can include:

• Switch to switch
• Server to switch
• Storage to switch
• Top-of-rack switching
• Leaf and spine networking
• Data-center interconnects within a row
• High-performance computing
• AI infrastructure
• Network aggregation

The correct cable depends on interface type, Ethernet speed, cable length, active or passive design, equipment manufacturer, supported coding, and compatibility at both ends.

What Is a DAC Cable?

DAC stands for Direct Attach Copper.

A DAC cable uses copper conductors with transceiver-style connectors permanently attached at both ends.

Instead of installing two separate transceiver modules and a separate patch cable, the DAC provides one integrated connection.

DAC cables are commonly used for short-distance high-speed Ethernet because they can provide:

• Low power consumption
• Low latency
• Simple installation
• Low cost compared with some optical alternatives
• Compact direct connectivity

What Is an AOC Cable?

AOC stands for Active Optical Cable.

An AOC uses optical fiber between integrated electronic transceiver assemblies at both ends.

Like DAC, an AOC does not require separate removable optical transceivers for a supported direct connection.

AOCs can provide:

• Longer reach than many copper DAC cables
• Lower cable weight
• Smaller cable diameter
• Resistance to electromagnetic interference
• High-speed optical connectivity

DAC vs. AOC

DAC and AOC cables perform similar direct-connect functions but use different transmission media.

DAC: Uses copper conductors and is typically selected for shorter high-speed connections.

AOC: Uses optical fiber and can provide greater reach with lighter cable construction.

The right choice depends on:

• Required distance
• Network speed
• Equipment compatibility
• Cable density
• Power consumption
• Routing requirements
• Budget

Passive DAC Cables

Passive DAC cables use copper conductors without active signal-conditioning electronics inside the cable assembly.

They are commonly used for the shortest direct connections between compatible network devices.

Advantages can include:

• Very low power consumption
• Low latency
• Simple design
• Cost-effective short-distance connectivity

Active DAC Cables

Active DAC cables include electronic signal conditioning inside the cable assembly.

This can allow longer copper reach than comparable passive DAC designs, depending on the interface and equipment.

Active DACs require slightly more power than passive cables but can extend direct copper connectivity where a passive cable would be too long.

Passive DAC vs. Active DAC

Passive DAC: Best suited to short connections and generally consumes less power.

Active DAC: Includes signal conditioning and can support longer distances on compatible interfaces.

Always verify that the network equipment supports the specific active or passive cable type.

AOC vs. Active DAC

Active DAC and AOC can both extend beyond the practical reach of passive copper.

Active DAC: Still uses copper and signal-conditioning electronics.

AOC: Converts electrical signals to optical transmission inside the integrated cable assembly.

AOC can provide advantages in cable weight, diameter, reach, and electromagnetic immunity.

DAC & AOC Cable Speeds

Modern direct-attach cables support many Ethernet speeds.

Common current applications include:

• 10 Gigabit Ethernet
• 25 Gigabit Ethernet
• 40 Gigabit Ethernet
• 50 Gigabit Ethernet
• 100 Gigabit Ethernet
• Higher-speed architectures on supported platforms

10G DAC Cables

10 Gigabit DAC cables commonly use SFP+ interfaces.

They are widely used for:

• Server to top-of-rack switch connections
• Switch uplinks
• Storage networking
• Short inter-switch links

10G SFP+ DAC remains a common choice for cost-effective short-distance data-center networking.

10G AOC Cables

10G Active Optical Cables provide integrated optical connectivity between compatible SFP+ ports.

AOC can be useful when a 10G link requires more distance or more flexible cable routing than a copper DAC can provide.

SFP+ DAC Cables

SFP+ is a common interface for 10 Gigabit Ethernet.

SFP+ DAC cables integrate the SFP+ interfaces and copper cable into one assembly.

They are commonly used with:

• 10G switches
• Servers
• Storage systems
• Firewalls
• Network appliances

SFP+ AOC Cables

SFP+ AOCs use integrated optical transceivers at each end of a fiber cable.

Current Hummingbird Networks inventory includes Ubiquiti long-range direct-attach optical cables using SFP+ interfaces for compatible network environments.

25G DAC Cables

25 Gigabit Ethernet commonly uses SFP28 interfaces.

SFP28 DAC cables are widely used between modern servers and switches because they provide substantially more bandwidth than 10G while preserving a compact form factor.

25G AOC Cables

25G AOCs provide integrated optical connectivity between compatible SFP28 ports.

They can be useful when server-to-switch or switch-to-switch distances exceed practical passive copper lengths.

SFP28 DAC Cables

SFP28 is one of the most common interfaces used for 25 Gigabit Ethernet.

Current Hummingbird Networks inventory includes Cisco SFP28 passive copper and Ubiquiti SFP28 direct-attach uplink cables for compatible network equipment.

SFP28 Cable Compatibility

SFP28 cables should be matched carefully to:

• Switch manufacturer
• Server adapter manufacturer
• Port speed
• Cable coding
• Supported cable length

Physical SFP28 fit alone does not guarantee platform compatibility.

40G DAC Cables

40 Gigabit Ethernet commonly uses QSFP+ interfaces.

QSFP+ DAC cables provide direct copper connections between compatible 40G equipment.

Applications include:

• Switch uplinks
• Spine and leaf links
• Server connectivity
• Data-center aggregation

40G AOC Cables

40G Active Optical Cables combine QSFP+ interfaces with integrated optical fiber.

Current Hummingbird Networks inventory includes Cisco and HPE 40G QSFP+ Active Optical Cables in longer direct-attach configurations.

QSFP+ DAC Cables

QSFP+ is commonly associated with 40 Gigabit Ethernet.

DAC designs can provide cost-effective short-distance 40G connectivity without separate optical modules.

QSFP+ AOC Cables

QSFP+ AOCs are often selected where a 40G connection requires greater reach or lower cable bulk than copper.

They can be especially useful in data centers with dense cable pathways.

50G DAC Cables

50 Gigabit Ethernet is increasingly used in modern enterprise and data-center networks.

Selected platforms use SFP56 connectivity for 50G links.

Current Hummingbird Networks inventory includes HPE SFP56-to-SFP56 50G Direct Attach Copper cables in multiple lengths.

50G SFP56 Cables

SFP56 extends the SFP form factor to support higher signaling rates used in 50 Gigabit Ethernet.

SFP56 DAC cables can be useful for:

• High-performance server connections
• Modern access and aggregation switching
• Data-center networking

SFP56 DAC Compatibility

Because 50G platforms can have specific hardware and firmware requirements, verify the cable part number against both connected devices.

Do not assume every SFP56 DAC works with every 50G switch or network adapter.

100G DAC Cables

100 Gigabit Ethernet commonly uses QSFP28 interfaces.

100G QSFP28 DAC cables provide direct copper connectivity for compatible high-speed network equipment.

Current Hummingbird Networks inventory includes Cisco and HPE 100G QSFP28 Direct Attach Copper solutions.

100G AOC Cables

100G AOCs combine QSFP28-style interfaces with integrated optical cabling.

Current Hummingbird Networks inventory includes HPE QSFP28 100G Active Optical Cables in multiple lengths as well as Hummingbird Networks compatible Cisco 100G AOCs.

QSFP28 DAC Cables

QSFP28 is widely used for 100 Gigabit Ethernet.

QSFP28 direct-attach copper can be practical for short:

• Switch-to-switch links
• Switch-to-server links
• Data-center uplinks
• Storage connections

QSFP28 AOC Cables

QSFP28 Active Optical Cables are useful where 100G connectivity must extend beyond typical passive copper distances while retaining a simple integrated cable assembly.

100GBASE-CR4 Cables

100GBASE-CR4 is a 100 Gigabit Ethernet copper direct-attach architecture used with compatible QSFP28 equipment.

Current Hummingbird Networks inventory includes Cisco 100GBASE-CR4 passive copper cables.

200G Direct-Attach Connectivity

200 Gigabit Ethernet is increasingly used in modern data-center and high-performance computing environments.

Depending on the platform, 200G direct connectivity can use QSFP56 and related high-speed interfaces.

Cable and breakout compatibility should be verified carefully for the exact equipment.

400G Direct-Attach Connectivity

400 Gigabit Ethernet is used in modern AI, cloud, high-performance computing, and large-scale data-center fabrics.

Interfaces can include QSFP-DD and other high-density pluggable formats.

As with lower-speed direct attach, cable coding and equipment compatibility are critical.

QSFP-DD Cables

QSFP-DD is commonly used for 400 Gigabit Ethernet and other high-capacity network applications.

QSFP-DD direct-attach and breakout solutions can support extremely high bandwidth over short data-center distances.

Breakout DAC Cables

Breakout cables allow one high-speed network port to connect to multiple lower-speed ports when the switch platform supports breakout operation.

Examples can include:

• 40G to 4 x 10G
• 100G to 4 x 25G
• 200G to multiple lower-speed ports
• 400G to multiple 100G ports

40G to 10G Breakout Cables

A compatible 40G QSFP+ port can sometimes be configured to operate as four 10G SFP+ connections using a breakout cable.

The switch must explicitly support this breakout mode.

100G to 25G Breakout Cables

A compatible 100G QSFP28 port can sometimes break out into four 25G SFP28 interfaces.

This can help connect multiple 25G servers or switches to a single high-density 100G port.

400G to 100G Breakout Cables

Modern high-density 400G ports can support breakout to multiple 100G links on compatible switches.

Breakout cable type, port configuration, lane mapping, and switch software support must all match.

DAC Breakout vs. AOC Breakout

Both copper and optical breakout designs are available for supported interfaces.

DAC breakout: Best suited to short, dense connections.

AOC breakout: Can provide greater distance and lighter cable routing.

DAC Cable Length

DAC cables are generally intended for short-distance links.

Common lengths can include:

• 0.5 meter
• 0.65 meter
• 1 meter
• 1.5 meters
• 2 meters
• 2.5 meters
• 3 meters
• 5 meters
• Other supported lengths

Maximum practical length depends on speed and whether the cable is passive or active.

Passive DAC Cable Length

Passive DAC is typically used for the shortest distances because signal loss increases as copper cable length increases.

Always follow the equipment manufacturer's supported cable lengths.

Active DAC Cable Length

Active DAC can support longer copper distances than passive DAC on selected interfaces because signal-conditioning electronics are built into the cable ends.

AOC Cable Length

AOC can support significantly longer direct connections than many passive DAC assemblies.

Current Hummingbird Networks inventory includes AOC products at lengths such as 7 meters, 10 meters, 15 meters, and 20 meters depending on the manufacturer and network speed.

10-Meter AOC Cables

10-meter AOCs can provide direct optical connectivity across racks or between nearby equipment locations where copper DAC would be impractical.

Hummingbird Networks offers compatible Cisco 100G AOC assemblies at 10-meter lengths.

20-Meter AOC Cables

20-meter AOCs provide substantially greater reach while maintaining the convenience of an integrated cable and transceiver assembly.

Current Hummingbird Networks inventory includes Ubiquiti SFP+ and Cisco 40G optical direct-attach configurations around this distance.

DAC Cable Power Consumption

Passive DAC cables generally consume very little electrical power because they do not contain active signal-processing electronics.

This can be advantageous in large data centers where thousands of connections can make per-port power consumption important.

AOC Power Consumption

AOCs require electrical power for optical conversion electronics inside each cable end.

Although consumption is higher than passive DAC, AOC can provide benefits in distance, cable weight, and routing flexibility.

DAC & AOC Latency

Both DAC and AOC are designed for high-speed network connectivity with very low transmission delay.

Passive copper DAC is often favored where extremely low latency and short distance are primary requirements.

DAC Cable Diameter

Higher-speed DAC assemblies can be relatively thick because they contain multiple copper conductors and shielding.

Cable diameter can affect:

• Rack cable density
• Bend radius
• Airflow
• Cable-management capacity

AOC Cable Diameter

AOC fiber assemblies are typically thinner and lighter than comparable copper direct-attach cables.

This can simplify routing through dense vertical and horizontal cable managers.

DAC Cable Bend Radius

DAC cables have specified minimum bend radii.

Avoid sharply bending the cable near the pluggable interface or forcing the cable around tight rack corners.

AOC Bend Radius

AOCs contain optical fiber and should be routed according to the manufacturer's minimum bend-radius requirements.

Excessive bending can damage the fiber or increase optical loss.

DAC Cable Weight

Copper DAC cables can become relatively heavy as length and conductor count increase.

In very dense racks, the combined weight of many DAC assemblies can place additional mechanical load on cable managers and equipment ports.

AOC Cable Weight

AOCs are generally lighter than equivalent longer copper assemblies.

This can be valuable for high-density data-center cabling.

DAC & AOC for Top-of-Rack Switching

Top-of-rack network designs place switches near the servers they connect.

Short server-to-switch distances make DAC a natural fit for many top-of-rack deployments.

AOC can be used when links need to extend farther across the rack row.

DAC & AOC for Leaf-Spine Networks

Leaf-spine architectures require large quantities of high-speed switch-to-switch links.

Depending on rack layout and distance, these links can use:

• DAC
• AOC
• Separate optical transceivers and fiber

DAC & AOC for Servers

Servers increasingly use 10G, 25G, 50G, and 100G network adapters.

DAC provides a cost-effective option for short server-to-switch links, while AOC can provide additional reach where required.

DAC & AOC for Network Switches

Network switches can use SFP+, SFP28, SFP56, QSFP+, QSFP28, and related interfaces for uplinks and high-speed device connections.

Direct-attach cables should match the supported port type and network speed exactly.

DAC & AOC for Storage Systems

High-performance storage can generate substantial network bandwidth.

DAC and AOC can support:

• iSCSI
• Ethernet storage fabrics
• High-speed server-to-storage connectivity
• Storage switching

Interface requirements depend on the storage platform.

DAC & AOC for Firewalls

Enterprise firewalls can include 10G, 25G, 40G, and 100G pluggable network interfaces.

DAC can provide short rack-level connections between the firewall and adjacent switches.

DAC & AOC for Data Centers

Data centers are one of the most common environments for direct-attach connectivity.

DAC and AOC can connect:

• Servers to leaf switches
• Leaf switches to spine switches
• Storage systems
• Firewalls
• Aggregation switches
• Network appliances

DAC & AOC for AI Infrastructure

AI and accelerated computing can generate extremely high network bandwidth between GPU servers, storage, and network fabrics.

Modern AI environments can use 100G, 200G, 400G, and higher-speed interfaces depending on architecture.

Short direct-attach links can reduce connection complexity in dense GPU clusters.

DAC & AOC for High-Performance Computing

High-performance computing environments value high bandwidth and low latency.

Direct-attach cabling can provide efficient short-distance connectivity between compute nodes and network switches.

DAC & AOC for Rack-to-Rack Connections

DAC can work well between neighboring racks when distances remain within supported copper limits.

AOC is often more practical as rack-to-rack distance increases.

DAC & AOC for Same-Rack Connections

Same-rack links are an ideal use case for passive DAC because cable distances are short.

Examples include:

• Server to top-of-rack switch
• Firewall to switch
• Storage to switch
• Switch stacking or interconnect on supported equipment

DAC vs. Fiber Transceivers

DAC and conventional optical fiber links have different architectures.

DAC: Integrated copper cable and pluggable interfaces.

Conventional fiber: Separate transceiver modules and removable fiber patch cable.

Separate optical components provide greater modularity and distance, while DAC can reduce cost and complexity at short range.

AOC vs. Fiber Transceivers

AOC uses optical fiber but integrates the optical electronics into the cable assembly.

A conventional fiber link uses separate transceiver modules at both ends.

AOC: Simple integrated optical connection.

Separate optics and fiber: Greater modularity, easier replacement of individual components, and broader distance options.

Explore Fiber Optic Cables and Transceiver Modules for modular optical links.

DAC vs. RJ45 Ethernet

DAC and conventional Ethernet patch cables both use copper, but they are different technologies.

RJ45 Ethernet: Uses twisted-pair cabling and RJ45-style connectors.

DAC: Uses integrated SFP or QSFP-family interfaces and is designed primarily for direct high-speed equipment connections.

Explore Ethernet Cables for conventional RJ45 networking.

Why Use DAC Instead of RJ45?

For supported high-speed short-distance interfaces, DAC can provide:

• Lower latency
• Lower power consumption
• High port density
• Simple direct connectivity

RJ45 remains preferable when conventional twisted-pair Ethernet infrastructure and longer structured copper runs are required.

Why Use AOC Instead of DAC?

AOC can be a better choice when:

• The distance exceeds passive DAC limits
• Cable weight matters
• High cable density makes copper difficult to route
• Electromagnetic interference is a concern

Why Use DAC Instead of AOC?

DAC can be preferable when:

• The link is short
• Lowest power consumption is important
• Low cost is a priority
• Extremely simple copper connectivity is sufficient

DAC & AOC Equipment Compatibility

Compatibility is one of the most important considerations when buying a direct-attach cable.

Verify:

• Manufacturer
• Switch or server model
• Port type
• Network speed
• Firmware requirements
• Cable coding
• Cable length
• Active or passive design

Are DAC Cables Universal?

No. A DAC cable with the correct physical connector can still be rejected by the equipment if coding or platform support does not match.

Verify compatibility with both devices before purchase.

Are AOC Cables Universal?

No. Active Optical Cables can also contain manufacturer-specific coding and must be supported by the equipment at both ends.

Vendor-Coded DAC Cables

Many enterprise network manufacturers validate particular DAC part numbers for their switches and adapters.

Vendor coding can allow the equipment to identify the cable and confirm supported operation.

Compatible DAC & AOC Cables

Compatible direct-attach cables are engineered to interoperate with supported equipment while providing an alternative to original manufacturer cable assemblies.

Hummingbird Networks offers compatible DAC and AOC solutions for multiple network ecosystems.

Dual-Vendor DAC Compatibility

Some environments connect equipment from two different manufacturers.

In those situations, each end of the direct-attach cable can require different coding.

A properly designed dual-coded cable can provide compatibility with one manufacturer on one end and another manufacturer on the other.

Cisco DAC Cables

Cisco offers DAC connectivity across multiple network speeds and form factors.

Current Hummingbird Networks inventory includes Cisco:

• 25G SFP28 passive copper
• 40G QSFP connectivity
• 100G QSFP28 passive copper
• 40G Active Optical Cables

Cisco AOC Cables

Cisco Active Optical Cables provide integrated optical connections for compatible switching environments.

Current Hummingbird Networks inventory includes Cisco 40G QSFP AOCs and Hummingbird Networks compatible Cisco 100G QSFP AOCs.

HPE DAC Cables

HPE offers direct-attach copper for ProLiant, Synergy, Aruba Networking, storage, and other compatible infrastructure.

Current Hummingbird Networks inventory includes HPE:

• 10G SFP+
• 40G QSFP+
• 50G SFP56
• 100G QSFP28

HPE AOC Cables

HPE Active Optical Cables provide longer direct optical connectivity for compatible high-speed network equipment.

Current Hummingbird Networks inventory includes 40G QSFP+ and 100G QSFP28 HPE AOC products.

Ubiquiti DAC Cables

Ubiquiti offers direct-attach cables for compatible UniFi and other Ubiquiti network equipment.

Current Hummingbird Networks inventory includes SFP28 uplink cables and related direct-attach connectivity.

Ubiquiti AOC Cables

Ubiquiti Active Optical Cables provide longer-range direct connectivity using integrated optical interfaces.

Current Hummingbird Networks inventory includes long-range Ubiquiti SFP+ direct-attach optical cables.

Hummingbird Networks Compatible DAC Cables

Hummingbird Networks offers compatible direct-attach cable solutions for supported enterprise networking platforms.

Current Hummingbird Networks brand inventory includes compatible SFP+ and QSFP-family connectivity for manufacturers such as Cisco, HPE, Dell, Juniper, and other network ecosystems.

Hummingbird Networks Compatible AOC Cables

Compatible AOCs provide integrated optical connectivity for supported enterprise network equipment.

Current Hummingbird Networks offerings include compatible Cisco 100G Active Optical Cables and other platform-specific direct-attach solutions.

DAC Cable Failure Symptoms

A faulty or incompatible DAC can result in:

• No link
• Intermittent link
• Reduced speed
• Interface errors
• Unsupported transceiver messages
• Link flapping

AOC Failure Symptoms

AOC problems can appear as:

• No optical link
• Intermittent connectivity
• Port errors
• Unsupported cable warnings
• Link instability

Because the optical electronics are integrated, the entire AOC assembly is generally replaced if it fails.

Troubleshooting DAC Connectivity

If a DAC does not establish a link:

• Verify the cable part number
• Confirm port speed
• Check equipment compatibility
• Reseat both ends
• Inspect for cable damage
• Check switch logs
• Verify port configuration

Troubleshooting AOC Connectivity

For AOC troubleshooting, verify:

• Correct interface type
• Supported network speed
• Manufacturer coding
• Port configuration
• Cable bend radius
• Equipment firmware

DAC Cable Management

DAC cables can become bulky in high-density racks.

Good cable management can help:

• Support cable weight
• Maintain bend radius
• Protect equipment ports
• Preserve rack airflow
• Simplify equipment replacement

Explore Cable Management for rack cable-routing infrastructure.

AOC Cable Management

AOCs are typically thinner than comparable copper DAC cables but still require proper optical bend-radius protection.

Do not sharply bend AOC assemblies near the transceiver housing.

DAC & AOC Airflow

Dense bundles of high-speed cables can obstruct airflow around network switches and servers.

Cable pathways should keep switch fan modules and server exhaust paths unobstructed.

DAC & AOC Port Strain

Heavy copper cable bundles can place mechanical strain on SFP and QSFP ports.

Cable managers should support the cable weight rather than allowing equipment ports to carry the full load.

DAC & AOC Cable Labeling

Direct-attach cables should be labeled clearly in dense network environments.

Useful information can include:

• Source device
• Source port
• Destination device
• Destination port
• Network speed
• Cable identifier

DAC & AOC Documentation

Documenting direct-attach connectivity can simplify troubleshooting and equipment replacement.

Network documentation can record:

• Cable part number
• Cable length
• Port mapping
• Network speed
• Manufacturer compatibility
• Breakout configuration

DAC Cable Hot Swapping

SFP and QSFP-family direct-attach cables are generally designed around hot-pluggable interfaces on compatible equipment.

Follow the switch, server, and cable manufacturer requirements before installing or removing cables from operating equipment.

AOC Hot Swapping

AOCs use similar pluggable interface housings and can be hot-pluggable on supported network equipment.

Always follow equipment manufacturer guidance.

DAC & AOC for Redundant Networks

Servers and network devices often use multiple direct-attach links for redundancy.

Redundant links can connect to:

• Separate switches
• Separate switch fabrics
• Different network adapters
• Independent storage paths

DAC & AOC for Link Aggregation

Multiple DAC or AOC connections can be combined using supported link-aggregation technologies to increase total bandwidth and provide redundancy.

The switches and endpoints must support the chosen aggregation configuration.

DAC & AOC for Switch Stacking

Some switches use SFP or QSFP-family interfaces for stacking or virtual-chassis links.

A standard DAC should only be used for stacking when the switch manufacturer explicitly supports that cable and interface for the stacking function.

DAC & AOC for Network Uplinks

High-speed uplinks often use direct-attach connections between access, aggregation, and core switches.

DAC works especially well for adjacent equipment, while AOC can extend uplinks across longer rack or row distances.

DAC & AOC in 1U Switches

Modern 1U data-center switches can contain dozens of SFP28 or QSFP ports.

High port density makes cable diameter, bend radius, and cable management important considerations.

Choosing Between DAC, AOC & Fiber

There is no single best cable for every high-speed network link.

Consider:

• Distance
• Speed
• Equipment compatibility
• Power consumption
• Cable weight
• Port density
• Future flexibility
• Budget

Passive DAC: Excellent for short low-cost links.

Active DAC: Useful for somewhat longer copper links.

AOC: Useful for longer direct optical links.

Separate fiber and transceivers: Best when modularity and longer-distance flexibility are priorities.

How to Choose a DAC Cable

Identify the Port Type

Determine whether the devices use SFP+, SFP28, SFP56, QSFP+, QSFP28, QSFP-DD, or another interface.

Identify the Network Speed

Verify whether the link operates at 10G, 25G, 40G, 50G, 100G, or another speed.

Measure the Cable Distance

Choose the shortest practical cable that allows correct routing without tension.

Choose Passive or Active

Passive DAC is commonly selected for short connections, while active DAC can provide additional reach.

Verify Both Devices

Check compatibility with both the device at the first end and the device at the second end.

Verify Manufacturer Coding

Enterprise switches can require specific cable identification or coding.

How to Choose an AOC Cable

Identify the Interface

Determine the pluggable interface required at each end.

Verify Speed

Select an AOC rated for the exact Ethernet speed.

Measure Distance

Choose an appropriate cable length without excessive slack.

Check Bend Requirements

Plan cable routing so the optical assembly remains within its bend-radius limits.

Verify Equipment Compatibility

Confirm supported cable part numbers or compatible coding for both devices.

DAC & AOC Selection Checklist

Before purchasing a DAC or AOC cable, verify:

• Device at first end
• Device at second end
• First-end port type
• Second-end port type
• Network speed
• Required cable length
• Passive DAC, active DAC, or AOC
• Manufacturer coding
• Breakout requirements
• Firmware support
• Minimum bend radius
• Cable-management capacity
• Future network design

DAC & AOC Capacity Planning

Direct-attach cable infrastructure should be planned alongside switches, servers, storage, and racks.

Consider future transitions from:

• 10G to 25G
• 25G to 50G
• 40G to 100G
• 100G to 200G or 400G

Cable architecture should support the expected equipment lifecycle and network design.

Why Buy DAC & AOC Cables from Hummingbird Networks?

Direct-attach cable selection requires matching port type, network speed, equipment compatibility, cable coding, distance, active or passive architecture, and network design.

Hummingbird Networks offers high-speed direct-attach connectivity for business, enterprise, server-room, storage, data-center, AI, and high-performance networking environments.

Customers can turn to our team for:

• 10G DAC cables
• 10G AOC cables
• 25G DAC cables
• 25G AOC cables
• 40G DAC cables
• 40G AOC cables
• 50G DAC cables
• 100G DAC cables
• 100G AOC cables
• SFP+ cables
• SFP28 cables
• SFP56 cables
• QSFP+ cables
• QSFP28 cables
• Passive DAC cables
• Active DAC cables
• Breakout cables
• Cisco DAC and AOC cables
• HPE DAC and AOC cables
• Ubiquiti direct-attach cables
• Hummingbird Networks compatible DAC and AOC cables
• Product and compatibility guidance

Whether you need a short passive SFP28 cable for a 25G server link, an HPE SFP56 DAC for 50G connectivity, a Cisco 100G QSFP28 copper cable, or an Active Optical Cable spanning multiple racks, Hummingbird Networks can help identify direct-attach connectivity based on speed, interface, distance, equipment, and network architecture.

Frequently Asked Questions About DAC & AOC Cables

What does DAC stand for?

DAC stands for Direct Attach Copper.

What does AOC stand for?

AOC stands for Active Optical Cable.

What is a DAC cable?

A DAC is a copper network cable with SFP or QSFP-family pluggable interfaces permanently attached at both ends.

What is an AOC cable?

An AOC is a fiber optic cable with active optical transceiver electronics integrated into both ends.

What is the difference between DAC and AOC?

DAC uses copper and is commonly selected for shorter links. AOC uses optical fiber and typically supports longer distances with lower cable weight.

What is a passive DAC?

A passive DAC is a direct copper cable without active signal-conditioning electronics.

What is an active DAC?

An active DAC includes electronics that condition the electrical signal and can support greater distance than comparable passive copper cables.

Do DAC cables require transceivers?

No. The pluggable interfaces are built into the DAC cable.

Do AOC cables require transceivers?

No. Optical transceiver electronics are integrated into both ends of the AOC.

Can DAC cables support 10 Gigabit Ethernet?

Yes. SFP+ DAC cables are widely used for 10 Gigabit Ethernet.

Can DAC cables support 25 Gigabit Ethernet?

Yes. SFP28 DAC cables are commonly used for 25 Gigabit Ethernet.

Can DAC cables support 40 Gigabit Ethernet?

Yes. QSFP+ DAC cables can support compatible 40 Gigabit Ethernet links.

Can DAC cables support 50 Gigabit Ethernet?

Yes. SFP56 DAC cables are used on compatible 50 Gigabit Ethernet equipment.

Can DAC cables support 100 Gigabit Ethernet?

Yes. QSFP28 DAC cables are widely used for compatible 100 Gigabit Ethernet links.

Can AOC cables support 100 Gigabit Ethernet?

Yes. QSFP28 Active Optical Cables can provide integrated 100G optical connectivity.

What is an SFP+ DAC cable?

An SFP+ DAC is a direct-attach copper cable commonly used between compatible 10G network ports.

What is an SFP28 cable?

SFP28 direct-attach cables are commonly used for 25 Gigabit Ethernet.

What is an SFP56 cable?

SFP56 direct-attach connectivity is commonly used on compatible 50 Gigabit Ethernet equipment.

What is a QSFP+ cable?

QSFP+ direct-attach cables are commonly used for 40 Gigabit Ethernet.

What is a QSFP28 cable?

QSFP28 direct-attach cables are widely used for 100 Gigabit Ethernet.

What is a QSFP-DD cable?

QSFP-DD is a high-density interface commonly used for 400 Gigabit Ethernet and related high-speed network architectures.

What is a breakout DAC cable?

A breakout DAC connects one high-speed port to several lower-speed ports when the network equipment supports breakout operation.

Can a 100G port break out into four 25G ports?

Yes, on compatible switches using supported QSFP28-to-SFP28 breakout cabling and the appropriate port configuration.

Can a 40G port break out into four 10G ports?

Yes, on compatible switches using supported QSFP+-to-SFP+ breakout connectivity.

How long can a passive DAC cable be?

Supported length depends on interface and network speed. Passive DAC is generally intended for short links, often within the same rack or between nearby equipment.

How long can an active DAC cable be?

Active DAC can support greater distances than passive DAC, but supported length varies by interface and equipment platform.

How long can an AOC cable be?

AOCs can support significantly longer direct connections than passive DAC. Current Hummingbird Networks inventory includes AOCs ranging from several meters to approximately 20 meters depending on the product.

Is DAC faster than fiber?

DAC and optical fiber can support the same Ethernet data rate when each technology is designed for that speed. The differences involve distance, power, cost, cable characteristics, and architecture.

Does DAC have lower latency than AOC?

Passive DAC can provide extremely low signal delay, although both DAC and AOC latency is very small in typical data-center applications.

Does DAC use less power than AOC?

Passive DAC generally consumes less power because it does not require active optical conversion electronics.

Is AOC lighter than DAC?

Yes. AOCs are generally thinner and lighter than longer high-speed copper DAC assemblies.

Is AOC affected by electromagnetic interference?

The optical transmission path itself is resistant to electromagnetic interference because data travels as light.

When should I use DAC?

DAC is well suited to short high-speed links where low power consumption, low cost, and simple connectivity are priorities.

When should I use AOC?

AOC is useful where direct connectivity requires greater distance, lower cable weight, smaller diameter, or optical transmission.

When should I use separate transceivers and fiber?

Separate optical modules and fiber are useful when modularity, longer distance, or the ability to replace individual components is important.

Are DAC cables universal?

No. DAC compatibility can depend on manufacturer coding, equipment model, port type, network speed, and firmware support.

Are AOC cables universal?

No. AOCs also need to be supported by the equipment at both ends.

Can I connect two different switch brands with a DAC cable?

Potentially, but the cable can require manufacturer-specific coding at each end. Use a cable explicitly designed for both devices.

Can I use a Cisco DAC in an HPE switch?

Only if the HPE equipment explicitly supports the cable or the cable is correctly coded for the HPE port. Do not assume compatibility based on connector shape alone.

Why does my switch say the DAC is unsupported?

The cable can have incompatible vendor coding, unsupported speed, unsupported length, incorrect part number, or firmware compatibility issues.

Can a damaged DAC cause link errors?

Yes. Physical cable or connector damage can cause no-link conditions, intermittent connectivity, or port errors.

Can an AOC be repaired?

AOCs are normally treated as integrated cable assemblies and are typically replaced if the cable or optical electronics fail.

Can DAC cables be bent tightly?

No. DAC cables should remain within manufacturer bend-radius limits to avoid mechanical or electrical damage.

Can AOCs be bent tightly?

No. AOCs contain fiber and should be routed within the manufacturer's optical bend-radius requirements.

Are DAC cables good for server connections?

Yes. DAC is widely used for short server-to-switch links at speeds such as 10G, 25G, 50G, and 100G.

Are AOCs good for server connections?

Yes. AOC can provide longer direct server-to-switch connectivity where copper distance or cable bulk becomes limiting.

Are DAC cables good for data centers?

Yes. DAC is widely used for short, high-speed data-center connections, especially within a rack.

Are AOCs good for data centers?

Yes. AOCs are widely used for longer direct high-speed links and high-density optical routing.

Can DAC be used for switch stacking?

Some switch platforms support DAC-based stacking or interconnect links, but the exact cable and port must be approved for that function.

Does Hummingbird Networks carry Cisco DAC cables?

Yes. Current inventory includes Cisco 25G SFP28, 40G QSFP, and 100G QSFP28 direct-attach connectivity.

Does Hummingbird Networks carry Cisco AOC cables?

Yes. Current inventory includes Cisco and Cisco-compatible Active Optical Cables for supported high-speed environments.

Does Hummingbird Networks carry HPE DAC cables?

Yes. Current inventory includes HPE 10G, 40G, 50G, and 100G direct-attach connectivity.

Does Hummingbird Networks carry HPE AOC cables?

Yes. Hummingbird Networks currently carries HPE 40G and 100G Active Optical Cable products in multiple lengths.

Does Hummingbird Networks carry Ubiquiti direct-attach cables?

Yes. Current inventory includes Ubiquiti SFP28 uplink cables and long-range SFP+ Active Optical Cable connectivity.

Does Hummingbird Networks offer compatible DAC and AOC cables?

Yes. Hummingbird Networks offers compatible DAC and AOC products for supported enterprise networking platforms.

Can Hummingbird Networks help me choose the correct DAC or AOC?

Yes. Providing both equipment models, port types, network speed, required length, and whether the connection is straight-through or breakout can help identify appropriate direct-attach cable options.

Shop DAC & AOC Cables

Build high-speed switch, server, storage, and data-center connections with Direct Attach Copper and Active Optical Cables for 10G, 25G, 40G, 50G, 100G, and other modern network architectures.

From short passive SFP+ and SFP28 copper links to HPE SFP56 50G connectivity, Cisco and HPE QSFP28 100G direct attach, and longer Active Optical Cables, Hummingbird Networks can help organizations select DAC and AOC connectivity based on speed, interface, distance, equipment compatibility, cable architecture, and network design.