For short 100G QSFP28 links, my best overall pick is the 10Gtek 1 m passive DAC, a practical middle ground between reach and cable bulk. The 0.5 m 2-pack stands out for connecting nearby devices in more than one rack position, while the 3 m Cisco-compatible cable suits longer in-rack runs when its stated compatibility matches your switch. The main tradeoffs are cable length, host compatibility, and wiring type: passive copper fits short runs, but it is not a substitute for optical cabling over longer distances. A QSFP28-to-4×25G breakout cable also serves a different topology than a standard QSFP28-to-QSFP28 link. Read on for the full breakdown and guidance on matching a cable to your ports and layout.
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Key Takeaways
- One meter is the strongest general-purpose length in this lineup: it offers more routing flexibility than the 0.5 m options without reaching the 2 m and 3 m choices, where cable routing and host support deserve closer attention.
- The 0.5 m 2-pack is the standout for multiple short links: it gives buyers two cables for tightly spaced equipment, while a single short cable is simpler when only one connection is needed.
- Compatibility labels are useful clues, not universal guarantees: the Juniper-, Cisco-, and Mellanox-specific listings make host matching easier, but buyers still need to check both port support and vendor coding.
- The 3 m cables favor reach within a rack, not long-distance runs: their passive copper format remains intended for short connections, so distance requirements beyond the cable’s supported range call for another cable type.
- The 4×25G breakout is a different network design choice: it connects a QSFP28 port to four SFP28 links, unlike the other 13 standard QSFP28-to-QSFP28 cables.
| 10Gtek 100G QSFP28 Passive DAC Cable, 0.5 m |  | Best for Tight Rack Links | Cable type: Passive twinax copper | Connectors: QSFP28 to QSFP28 | Data rate: 100 Gb/s | VIEW ON AMAZON | See Our Full Breakdown |
| 10Gtek 100G QSFP28 DAC Cable – 100GBASE-CR4 Passive Direct Attach Copper Twinax for Juniper JNP-100G-DAC-1M, 1 Meter (3.3 ft) | | Best for Juniper-Matched 1 m Links | Cable type: Passive PVC copper | Connector type: Listed as QSFP+; product description specifies QSFP-28 | Data rate: 100 Gbps | VIEW ON AMAZON | See Our Full Breakdown |
| 10Gtek 100G QSFP28 Passive DAC Twinax Cable, 3 m (10 ft), Cisco Compatible | | Best for Longer Passive Rack Runs | Cable type: Passive copper twinax | Connectors: QSFP28 to QSFP28 | Data rate: 100 Gb/s | VIEW ON AMAZON | See Our Full Breakdown |
| 10Gtek 100G QSFP28 to QSFP28 Passive DAC Cable, 1 m | | Best All-Around 1 m Choice | Cable type: Passive twinax copper | Connectors: QSFP28 to QSFP28 | Data rate: 100 Gb/s | VIEW ON AMAZON | See Our Full Breakdown |
| 10Gtek 100G QSFP28 Passive DAC Twinax Cable, 0.5 m, 2-Pack |  | Best for Two Short Links | Cable type: Passive direct-attach copper twinax | Connectors: QSFP28 to QSFP28 | Data rate: 100 Gbps | VIEW ON AMAZON | See Our Full Breakdown |
| 10Gtek 100GBASE-CR4 QSFP28 to QSFP28 Passive DAC Twinax Cable, 0.5 m | | Best for Short Dell Links | Cable type: Passive copper twinax DAC | Connectors: QSFP28 to QSFP28, male-to-male | Data rate: 100 gigabits per second | VIEW ON AMAZON | See Our Full Breakdown |
| 10Gtek 100Gb/s QSFP28 Passive Copper DAC Cable, 2 m, 30 AWG, Compatible with Mellanox ETH MCP1600-C002E30N | | Best for Mellanox-Matched Deployments | Cable type: Passive copper DAC | Model: 100GBASE-CR4 ETH 100GbE QSFP28 to QSFP28 | Length: 2 meters | VIEW ON AMAZON | See Our Full Breakdown |
| 10Gtek 100GBASE-CR4 QSFP28 Passive Copper Twinax Cable, 2 m | | Best for Dell Rack-to-Rack Links | Cable type: Passive copper twinax | Ethernet standard: 100GBASE-CR4 | Connectors: QSFP28 to QSFP28, male-to-male | VIEW ON AMAZON | See Our Full Breakdown |
| Wiitek 100GbE QSFP28 DAC Twinax Cable, 0.5 Meter Passive Copper Cable |  | Best for Broad Brand Compatibility | Model: QSFP-100G-CU0.5M | Connector type: QSFP28 | Cable type: Passive twinax copper | VIEW ON AMAZON | See Our Full Breakdown |
| 10Gtek 100G QSFP28 Passive DAC Cable, 3 m | | Best for Longer Short-Reach Links | Cable type: Passive direct-attach copper twinax | Connectors: QSFP28 to QSFP28 | Standard: 100GBASE-CR4 | VIEW ON AMAZON | See Our Full Breakdown |
| 10Gtek 100G QSFP28 Passive DAC Twinax Cable, 2 m, Cisco QSFP-100G-CU2M Compatible | | Best for Cisco-Compatible 2 m Links | Cable type: Passive copper twinax | Connectors: QSFP28 to QSFP28 | Data rate: 100 Gb/s | VIEW ON AMAZON | See Our Full Breakdown |
| 10Gtek 100Gb/s QSFP28 Passive DAC Cable, Mellanox Compatible, 1 Meter | | Best for Mellanox Interconnects | Model: CAB-ZQP/ZQP-P1M-30 | Cable type: QSFP28 passive direct attach copper | Data rate: 100 Gb/s | VIEW ON AMAZON | See Our Full Breakdown |
| 10Gtek 100G QSFP28 Passive DAC Cable, 2 m | | Best for Juniper-Listed 100GBASE-CR4 Links | Cable type: Passive copper twinax | Connector type: QSFP28 to QSFP28 | Data transfer rate: 100 Gb/s | VIEW ON AMAZON | See Our Full Breakdown |
| 10Gtek 100G QSFP28 to 4×25G SFP28 Passive DAC Breakout Cable, 3 m |  | Best for 100G-to-25G Breakout | Cable type: Passive direct attach copper twinax | Connectors: QSFP28 to 4× SFP28 | Data rate: 100 Gb/s | VIEW ON AMAZON | See Our Full Breakdown |
| qsfp28 dac cables 100g | Cable type | Length | Data rate | Connectors |
|---|---|---|---|---|
| 10Gtek 100G QSFP28 Passive DAC | Passive twinax copper | 0.5 m (1.64 ft, including connectors) | 100 Gb/s | QSFP28 to QSFP28 |
| 10Gtek 100G QSFP28 DAC Cable | Passive PVC copper | 1 meter (3.3 ft) | 100 Gbps | — |
| 10Gtek 100G QSFP28 Passive DAC | Passive copper twinax | 3 m (10 ft) | 100 Gb/s | QSFP28 to QSFP28 |
| 10Gtek 100G QSFP28 to QSFP28 P | Passive twinax copper | 1 m (3.3 ft) | 100 Gb/s | QSFP28 to QSFP28 |
| 10Gtek 100G QSFP28 Passive DAC | Passive direct-attach copper twinax | — | 100 Gbps | QSFP28 to QSFP28 |
| 10Gtek 100GBASE-CR4 QSFP28 to | Passive copper twinax DAC | 0.5 meters (1.64 feet) | 100 gigabits per second | QSFP28 to QSFP28, male-to-male |
| 10Gtek 100Gb/s QSFP28 Passive | Passive copper DAC | 2 meters | 100 Gb/s | QSFP28 to QSFP28, male-to-male |
| 10Gtek 100GBASE-CR4 QSFP28 Pas | Passive copper twinax | 2 m (6.5 ft) | 100 Gbps | QSFP28 to QSFP28, male-to-male |
| Wiitek 100GbE QSFP28 DAC Twina | Passive twinax copper | 0.5 meters | 28.3125 Gbps per channel | — |
| 10Gtek 100G QSFP28 Passive DAC | Passive direct-attach copper twinax | 3 meters (10 ft) | — | QSFP28 to QSFP28 |
| 10Gtek 100G QSFP28 Passive DAC | Passive copper twinax | 2 m (6.5 ft) | 100 Gb/s | QSFP28 to QSFP28 |
| 10Gtek 100Gb/s QSFP28 Passive | QSFP28 passive direct attach copper | 1 meter | 100 Gb/s | — |
| 10Gtek 100G QSFP28 Passive DAC | Passive copper twinax | 2 meters (6.5 feet) | — | — |
| 10Gtek 100G QSFP28 to 4×25G SF | Passive direct attach copper twinax | 3 meters (10 ft) | 100 Gb/s | QSFP28 to 4× SFP28 |
More Details on Our Top Picks
10Gtek 100G QSFP28 Passive DAC Cable, 0.5 m
For a very short 100G connection between neighboring QSFP28 ports, this half-meter cable keeps the run compact and uses passive twinax, so the cable itself needs no added power. 10Gtek says each unit is tested on switches before delivery, and the listed compatibility includes Cisco, Ubiquiti, Arista, and Supermicro equipment. Compared with the 10Gtek 1 m QSFP28 Passive DAC, this model is easier to keep tidy when ports sit close together, but it gives you less routing slack. It is a strong fit for a rack layout planned around short copper runs, not a flexible choice for links across racks. Check the switch’s supported cable coding and QSFP28 requirements before ordering; broad listed compatibility is not a guarantee for every platform.
Pros:- Supports 100 Gb/s over QSFP28-to-QSFP28 connections
- Passive twinax requires no additional cable power
- Tested on switches before delivery
- 30 AWG cable suits compact, short rack runs
Cons:- Half-meter reach limits placement and cable routing
- Requires compatible QSFP28 ports and platform support
Best for: Data center technicians connecting adjacent QSFP28 ports that are within half a meter and want a short, passive copper link.
Not ideal for: Teams routing between racks or around obstacles, since the 0.5 m length leaves little slack; also skip it if the switch does not support the cable.
- Cable type:Passive twinax copper
- Connectors:QSFP28 to QSFP28
- Data rate:100 Gb/s
- Length:0.5 m (1.64 ft, including connectors)
- Cable gauge:30 AWG
- Compatible model:Cisco QSFP-100G-CU0.5M
- Operating temperature:0–70 °C
- Compliance:SFF-8436, SFF-8665, IEEE 802.3bj, RoHS
Our verdict“Choose this for a verified, compact 100G link between nearby QSFP28 ports; pick the 1 m version when you need more routing room.”
10Gtek 100G QSFP28 DAC Cable – 100GBASE-CR4 Passive Direct Attach Copper Twinax for Juniper JNP-100G-DAC-1M, 1 Meter (3.3 ft)
This pick makes the most sense when a one-meter 100GBASE-CR4 link needs to match Juniper JNP-100G-DAC-1M equipment. Its passive copper design avoids extra cable power and is described as individually tested for signal integrity, making it a practical short-run choice for a switch, router, or server connection. Compared with the 10Gtek half-meter option, the extra length gives more room to route around nearby hardware, while remaining a short-reach cable. The main caveat is that its compatibility story is more specifically anchored to Juniper than the 10Gtek 1 m model, which lists a Cisco part reference. The source data also labels the connector type “QSFP+” while describing a QSFP-28 cable, so verify the actual port and part specification before deployment.
Pros:- Supports 100 Gbps 100GBASE-CR4 links
- Passive design offers low power use and low latency
- Individually tested for signal integrity
- One-meter length provides more routing room than a 0.5 m cable
Cons:- Only the one-meter length is specified
- Short-reach copper is not suited to longer inter-rack runs
- Connector type is listed as QSFP+ despite the QSFP28 product description
Best for: Network teams with Juniper JNP-100G-DAC-1M equipment seeking a tested, passive one-meter 100G copper connection.
Not ideal for: Buyers who need multiple length choices, longer reach, or an unambiguous connector specification without confirming the product details first.
- Cable type:Passive PVC copper
- Connector type:Listed as QSFP+; product description specifies QSFP-28
- Data rate:100 Gbps
- Length:1 meter (3.3 ft)
- Gauge:30 AWG
- Compatible device:Juniper JNP-100G-DAC-1M; switches, routers, and servers
- Model:CAB-ZQP/ZQP-P1M-30 (Juniper-1pc)
- Design features:Passive, low power consumption, low latency
Our verdict“A sensible match for Juniper-based one-meter 100G links, provided you confirm connector and platform compatibility before buying.”
10Gtek 100G QSFP28 Passive DAC Twinax Cable, 3 m (10 ft), Cisco Compatible
Among these five, the 3 m length offers the most routing reach while keeping a passive QSFP28 copper design. That makes it a candidate for connections between nearby racks or equipment with a less direct cable path, where the half-meter and one-meter options may come up short. It supports 100 Gb/s, is tested on switches before delivery, and lists compatibility with Cisco QSFP-100G-CU3M plus Ubiquiti, Arista, and Supermicro devices. Compared with the 10Gtek 1 m passive cable, this model gives installers more flexibility but also needs more space for cable management. Its passive format is still meant for short links, not long-distance runs, and the listing advises confirming compatibility with the specific equipment. Plan the route before choosing this over shorter options.
Pros:- 3 m reach gives more routing flexibility than the 0.5 m and 1 m options
- Supports 100 Gb/s over QSFP28-to-QSFP28 connectors
- Passive cable requires no additional power
- Switch-tested and lists several equipment families
Cons:- Longer cable adds slack and management needs in compact racks
- Still limited to short-reach copper connections
- Compatibility should be confirmed for the exact switch or device
Best for: Installers connecting compatible 100G QSFP28 ports across adjacent racks or along a longer in-rack route of up to 3 m.
Not ideal for: Buyers with closely positioned ports who want minimal cable bulk, or anyone needing a link beyond short-reach passive copper distances.
- Cable type:Passive copper twinax
- Connectors:QSFP28 to QSFP28
- Data rate:100 Gb/s
- Length:3 m (10 ft)
- Wire gauge:30 AWG
- Compatible part number:Cisco QSFP-100G-CU3M
- Operating temperature:0–70 °C
- Compliance:SFF-8665, IEEE 802.3bj, RoHS
Our verdict“Pick this when a compatible passive 100G link needs more reach than the shorter cables provide, but not a longer-distance optical solution.”
10Gtek 100G QSFP28 to QSFP28 Passive DAC Cable, 1 m
This is the straightforward choice when a one-meter passive 100G link fits the rack layout and you want a listed Cisco reference point. The QSFP28-to-QSFP28 copper cable supports 100 Gb/s, needs no additional power, and is described as tested on switches before delivery. Compared with the 0.5 m 10Gtek cable, it allows more room for routing; compared with the Juniper-focused 1 m cable in this roundup, its product data clearly specifies QSFP28 connectors and cites Cisco QSFP-100G-CU1M. That makes its fit easier to interpret, though it does not remove the need to check your switch’s cable support. The tradeoff is reach: one meter cannot replace a longer run, and choosing extra length where ports are adjacent can leave unwanted slack.
Pros:- Clear QSFP28-to-QSFP28 connector specification
- Supports 100 Gb/s over passive copper
- No additional cable power required
- Switch-tested and references Cisco QSFP-100G-CU1M
Cons:- One-meter reach may not cover a longer route between racks
- Compatibility still depends on the specific switch and port support
Best for: Buyers needing a standard one-meter passive 100G QSFP28 link, particularly those matching Cisco QSFP-100G-CU1M specifications.
Not ideal for: Installers whose ports are farther apart than one meter or whose rack layout benefits from a very short half-meter run.
- Cable type:Passive twinax copper
- Connectors:QSFP28 to QSFP28
- Data rate:100 Gb/s
- Length:1 m (3.3 ft)
- Wire gauge:30 AWG
- Compatible model:Cisco QSFP-100G-CU1M
- Operating temperature:0–70 °C
- Standards:SFF-8436, SFF-8665, IEEE 802.3bj
Our verdict“Choose this as a clear, general-purpose one-meter passive link when the Cisco reference and your equipment’s compatibility requirements line up.”
10Gtek 100G QSFP28 Passive DAC Twinax Cable, 0.5 m, 2-Pack
For an installation that needs two matching short links, this two-cable pack avoids sourcing separate units while keeping each run at a compact 0.5 m. Both cables are described as individually tested, with passive twinax construction intended for low power consumption and latency on compatible 100G ports. Compared with the single 0.5 m 10Gtek cable in this roundup, the defining benefit is having two cables for paired connections or a small deployment; the same short reach is also the main limitation. This is not a flexible pick for ports separated by distance or racks. Compatibility lists Cisco, Ubiquiti, Arista, and Supermicro, but I would still confirm the switch’s supported DAC coding and port requirements rather than treating the list as universal.
Pros:- Includes two QSFP28-to-QSFP28 cables
- Each cable supports 100 Gbps
- Passive design keeps cable power needs low
- Each cable is described as tested before delivery
Cons:- Both cables are limited to 0.5 m
- A two-cable pack is unnecessary for single-link installations
- Compatibility should be checked against exact equipment
Best for: Data center teams wiring two adjacent QSFP28 links, such as paired switch or storage connections, with compatible equipment.
Not ideal for: Buyers who need only one cable, need more than 0.5 m of routing length, or have not confirmed their equipment supports the DAC.
- Cable type:Passive direct-attach copper twinax
- Connectors:QSFP28 to QSFP28
- Data rate:100 Gbps
- Length per cable:0.5 m (1.64 ft)
- Quantity:2 cables
- Model:CAB-ZQP/ZQP-P0.5M
- Compatibility:Cisco QSFP-100G-CU0.5M, Ubiquiti, Arista, Supermicro
- Recommended uses:Data center networks, storage area networks, high-performance computing, telecommunications
Our verdict“Choose this pack when you need two compatible half-meter 100G connections; choose a single cable or longer length for other layouts.”
10Gtek 100GBASE-CR4 QSFP28 to QSFP28 Passive DAC Twinax Cable, 0.5 m
For a 100G QSFP28 link with almost no slack, this 0.5-meter cable suits switches positioned close together in the same rack. Its 26 AWG twinax construction and individual switch testing, including TDR and VNA checks, make it a focused choice for the Dell Force10 and Dell EMC systems listed in its compatibility details. Compared with the 2-meter 10Gtek Dell DAC in this roundup, this one reduces extra cable length and is easier to keep tidy across tightly placed ports, but it leaves less room for rearranging equipment. The listed compatibility is also narrower than the Wiitek 0.5-meter DAC, which names several other brands. I’d choose this when the Dell match and compact routing matter more than flexibility.
Pros:- Supports 100 Gigabit QSFP28-to-QSFP28 connections
- Short 0.5-meter length limits slack in tightly arranged racks
- TDR and VNA tested, with individual switch testing before delivery
- Passive design is intended for low power consumption and latency
Cons:- The short reach restricts equipment placement
- Compatibility details focus on specified Dell systems
Best for: Data-center operators connecting specified Dell Force10 or Dell EMC QSFP28 ports across a very short rack span.
Not ideal for: Teams that may move switches or need a longer route; the 0.5-meter reach offers little placement flexibility, and compatibility details center on specified Dell models.
- Cable type:Passive copper twinax DAC
- Connectors:QSFP28 to QSFP28, male-to-male
- Data rate:100 gigabits per second
- Length:0.5 meters (1.64 feet)
- Gauge:26 AWG
- Compatible devices:Dell Force10 DAC-Q28-100G-0.5M; Dell EMC DAC-QSFP-100G-0.5M
- Testing:TDR and VNA tested; individually tested on switches
Our verdict“Choose this for a short 100G connection between the listed Dell systems when tidy routing matters more than reach.”
10Gtek 100Gb/s QSFP28 Passive Copper DAC Cable, 2 m, 30 AWG, Compatible with Mellanox ETH MCP1600-C002E30N
This is the targeted pick for a 2-meter 100GbE connection to Mellanox ETH MCP1600-C002E30N. Its 30 AWG passive copper build offers more routing reach than the 0.5-meter Wiitek QSFP28 DAC, while remaining a direct-attach option for nearby equipment. The listed 3.3 V supply, low-power design, and individual testing suit deployments where each cable needs a specified Mellanox match. The tradeoff is that the compatibility information is much narrower than Wiitek’s multi-brand list and less Dell-oriented than 10Gtek’s 2-meter 26 AWG model. I’d treat the named Mellanox compatibility as the reason to choose this cable, not assume it fits every QSFP28 platform without checking the host requirements.
Pros:- Supports 100 Gb/s QSFP28 connections over 2 meters
- Specifically lists Mellanox ETH MCP1600-C002E30N compatibility
- Passive design supports low power consumption and latency
- Individually tested before delivery
Cons:- Compatibility details are specific to the listed Mellanox model
- The 30 AWG construction differs from the 26 AWG 2-meter Dell-oriented option
- Limited to short direct-attach links rather than longer runs
Best for: Network administrators linking nearby switches or servers that specifically require compatibility with Mellanox ETH MCP1600-C002E30N.
Not ideal for: Buyers seeking broadly listed vendor compatibility or a Dell-specific match; this listing names one Mellanox compatible device.
- Cable type:Passive copper DAC
- Model:100GBASE-CR4 ETH 100GbE QSFP28 to QSFP28
- Length:2 meters
- Gauge:30 AWG
- Data rate:100 Gb/s
- Connectors:QSFP28 to QSFP28, male-to-male
- Compatible device:Mellanox ETH MCP1600-C002E30N
- Supply voltage:3.3 V
- Bit error rate:Better than 1E-15
Our verdict“Pick this 2-meter cable when the named Mellanox compatibility is a better fit than the broader but differently targeted alternatives.”
10Gtek 100GBASE-CR4 QSFP28 Passive Copper Twinax Cable, 2 m
The 2-meter length and 26 AWG twinax make this a practical fit for 100G links between nearby racks when the equipment matches the listed Dell Force10 or Dell EMC models. It offers more routing room than the 0.5-meter Dell 10Gtek cable without stepping up to the 3-meter Juniper-focused 10Gtek option. Individual switch testing, alongside TDR and VNA checks, adds a concrete validation detail for installations where a failed short link can delay deployment. Its tradeoff is vendor focus: the product data names specific Dell models rather than a wide range of platforms. I’d favor it over the Mellanox-matched 2-meter cable when the Dell compatibility is the deciding factor, but buyers with other hardware should verify support before ordering.
Pros:- Supports 100GBASE-CR4 at 100 Gbps
- 2-meter length suits short links within or between adjacent racks
- 26 AWG twinax construction
- TDR, VNA, and individual switch testing are specified
Cons:- Compatibility is specified for particular Dell Force10 and Dell EMC models
- Passive direct-attach format is limited to short-distance links
Best for: Data-center teams connecting specified Dell Force10 or Dell EMC equipment across racks or within a rack where 2 meters is sufficient.
Not ideal for: Operators using non-listed hardware or needing a longer cross-rack route; the stated compatibility is tied to particular Dell models and the cable remains short-reach.
- Cable type:Passive copper twinax
- Ethernet standard:100GBASE-CR4
- Connectors:QSFP28 to QSFP28, male-to-male
- Data rate:100 Gbps
- Length:2 m (6.5 ft)
- Wire gauge:26 AWG
- Compatible models:Dell Force10 DAC-Q28-100G-2M; Dell EMC DAC-QSFP-100G-2M
- Testing:TDR and VNA tested; individually tested on switches
Our verdict“Choose this over the 0.5-meter Dell cable when you need extra routing room for a listed Dell 100G connection.”
Wiitek 100GbE QSFP28 DAC Twinax Cable, 0.5 Meter Passive Copper Cable
Among these short 100G DACs, the Wiitek stands out for its named compatibility across several network brands, including Cisco, Ubiquiti, Mikrotik, Netgear, and Supermicro. That makes it a useful alternative to the Dell-specific 0.5-meter 10Gtek cable when a rack mixes vendors. Its passive 30 AWG twinax design and 0.5-meter reach suit close port-to-port links while avoiding the power draw associated with active optics. The short length is the main constraint: unlike 10Gtek’s 2-meter Mellanox cable or 3-meter Juniper option, it offers little freedom for equipment placement. The per-channel rate is listed as 28.3125 Gbps, so buyers should confirm their platform’s QSFP28 support rather than infer compatibility from the brand list alone.
Pros:- Lists compatibility with several major networking brands and open-source switches
- Passive 30 AWG twinax design is suited to short, low-power links
- Adherence to IEEE 802.3 and QSFP28 MSA is specified
- Three-year product warranty is listed
Cons:- 0.5-meter length restricts equipment placement
- Compatibility still needs to be checked against the exact switch or host
- Per-channel rate is listed rather than a single aggregate data-rate figure
Best for: Teams with mixed Cisco, Ubiquiti, Mikrotik, Netgear, or Supermicro equipment making very short 100G rack connections.
Not ideal for: Buyers routing between separated devices or racks, or anyone whose switch compatibility is not confirmed; the cable is only 0.5 meters and requires platform support verification.
- Model:QSFP-100G-CU0.5M
- Connector type:QSFP28
- Cable type:Passive twinax copper
- Length:0.5 meters
- Data rate:28.3125 Gbps per channel
- Gauge:30 AWG
- Voltage:3.3 V
- Compatibility:Cisco, Ubiquiti, Mikrotik, Netgear, Supermicro, and open-source switches
- Standards and warranty:IEEE 802.3, SFF-8665, QSFP28 MSA, RoHS, CE, FCC; 3-year product warranty
Our verdict“Choose this for a very short 100G rack link when its broader named brand compatibility matters more than extra cable reach.”
10Gtek 100G QSFP28 Passive DAC Cable, 3 m
At 3 meters, this 10Gtek cable gives a little more routing freedom than the 2-meter Dell and Mellanox options while staying within the short-reach DAC role for nearby switches, routers, or servers. Its 30 AWG passive twinax supports 100GBASE-CR4, and the listing specifies Juniper JNP-100G-DAC-3M compatibility plus testing before delivery. Compared with the Wiitek 0.5-meter cable, it better suits equipment that cannot sit side by side; compared with the 2-meter 26 AWG Dell cable, its extra reach comes with a different gauge and a Juniper-oriented compatibility callout. The longer cable still will not solve a distant-room run, and buyers should verify their device’s DAC support rather than rely on the broad device categories alone.
Pros:- 3-meter length offers more placement flexibility than the 0.5-meter and 2-meter options
- Supports 100GBASE-CR4 QSFP28 connections
- 30 AWG passive twinax is intended for low-power, low-latency links
- Individually tested on switches before delivery
Cons:- Still designed for short connections within or between adjacent racks
- Compatibility details highlight one specific Juniper model
- The listed 30 AWG construction differs from the 26 AWG 2-meter Dell cable
Best for: Network teams connecting nearby switches, routers, or servers that need up to 3 meters of passive 100G reach, especially with Juniper JNP-100G-DAC-3M-compatible equipment.
Not ideal for: Installations needing longer-distance cabling or confirmed compatibility with a platform not named in the listing; this is a short-reach cable with specific Juniper compatibility detail.
- Cable type:Passive direct-attach copper twinax
- Connectors:QSFP28 to QSFP28
- Standard:100GBASE-CR4
- Length:3 meters (10 ft)
- Wire gauge:30 AWG
- Compatibility:Juniper JNP-100G-DAC-3M; switches, routers, and servers
- Use:Indoor
- Quantity:1
Our verdict“Pick this when a nearby 100G link needs more reach than the 2-meter options and your platform supports the stated DAC.”
10Gtek 100G QSFP28 Passive DAC Twinax Cable, 2 m, Cisco QSFP-100G-CU2M Compatible
This is a practical pick for buyers who need a 100 Gb/s QSFP28-to-QSFP28 link across a rack or nearby racks and want Cisco QSFP-100G-CU2M compatibility called out explicitly. Its passive 30 AWG twinax needs no separate power, which suits short data-center connections where simplicity and low cable power draw matter. Compared with the 1 m Mellanox-compatible 10Gtek cable, this model gives more reach but has less specific Mellanox-focused compatibility guidance. It is also less adaptable than the 3 m QSFP28-to-4×SFP28 breakout, which connects different port types. The tradeoff is straightforward: 2 m is still a short-reach limit, and equipment compatibility should be checked before deployment rather than inferred from the list of supported brands.
Pros:- Supports 100 Gb/s over QSFP28-to-QSFP28 connectors
- Passive design requires no additional power
- Cisco QSFP-100G-CU2M compatibility is specified
- Individually tested before delivery
Cons:- Limited to a 2 m passive-copper reach
- Device compatibility should be confirmed for the exact equipment
- Does not split one QSFP28 port into multiple SFP28 links
Best for: Network teams connecting Cisco-compatible QSFP28 ports over a short, up-to-2 m rack or adjacent-rack run.
Not ideal for: Buyers needing links longer than 2 m, a QSFP28-to-SFP28 breakout, or confirmed compatibility with a specific device not listed by the seller.
- Cable type:Passive copper twinax
- Connectors:QSFP28 to QSFP28
- Data rate:100 Gb/s
- Length:2 m (6.5 ft)
- Wire gauge:30 AWG
- Operating temperature:0–70 °C
- Compatible part number:Cisco QSFP-100G-CU2M
- Compliance:SFF-8665, IEEE 802.3bj, RoHS
Our verdict“Choose this cable for a short 100G connection when its stated Cisco compatibility and 2 m reach match your rack layout.”
10Gtek 100Gb/s QSFP28 Passive DAC Cable, Mellanox Compatible, 1 Meter
For a short Mellanox-to-Mellanox 100GbE connection, this 1 m cable has the most targeted compatibility information in this group: it names Mellanox ETH MCP1600-C001E30N. Its passive copper construction is intended to keep power use and latency low, while individual testing adds a useful check before installation. Compared with the Cisco-compatible 2 m 10Gtek cable, this one trades reach for a tighter fit in a compact rack layout and more specific Mellanox guidance. It is not the flexible choice for a mixed-vendor installation, since its stated compatibility centers on a particular Mellanox device. The LSZH outer material may suit buyers specifying low-smoke cable jackets, but the short length and focused compatibility make this a more specialized pick than a general QSFP28 DAC.
Pros:- Specifically lists Mellanox ETH MCP1600-C001E30N compatibility
- Passive design targets low power consumption and latency
- Individually tested before delivery
- LSZH outer material is specified
Cons:- Compatibility information focuses on a specific Mellanox device
- 1 m length may not reach between separated racks
- Does not provide the 2 m reach of the Cisco-compatible 10Gtek option
Best for: Data-center teams linking Mellanox ETH MCP1600-C001E30N equipment over a short 1 m run.
Not ideal for: Buyers connecting mixed-vendor equipment without confirmed compatibility, or those needing more than 1 m of reach.
- Model:CAB-ZQP/ZQP-P1M-30
- Cable type:QSFP28 passive direct attach copper
- Data rate:100 Gb/s
- Length:1 meter
- Connector gender:Male-to-male
- Compatibility:Mellanox ETH MCP1600-C001E30N
- Outer material:LSZH (Low Smoke Zero Halogen)
- Bit error rate:Better than 1E-15
- Voltage:3.3 V single supply
Our verdict“Pick this 1 m cable when the Mellanox device match is confirmed and a compact 100GbE connection is all you need.”
10Gtek 100G QSFP28 Passive DAC Cable, 2 m
This model suits buyers who want a 2 m passive QSFP28 copper link with 100GBASE-CR4 support and Juniper JNP-100G-DAC-2M listed as a compatible part. Individual switch testing and passive operation speak to a simple, low-power connection for short data-center runs. Compared with the Cisco QSFP-100G-CU2M-compatible 10Gtek cable, its stated equipment match shifts toward Juniper rather than Cisco; both offer the same basic connector format and 2 m class of reach. The 3 m QSFP28-to-4×SFP28 breakout serves a different job altogether, splitting a 100G port into four 25G connections. Here, the tradeoff is fixed short-reach use and compatibility that buyers should verify against their exact switches. The listing also describes indoor and outdoor use, but it remains a passive cable intended for short links.
Pros:- Supports short 100GBASE-CR4 connections
- Juniper JNP-100G-DAC-2M compatibility is specified
- Passive copper design targets low power use and latency
- Individually tested on switches before delivery
Cons:- 2 m length limits placement flexibility
- Compatibility is specified around Juniper part-number equipment
- Passive copper is not suited to longer-distance runs
Best for: Network operators connecting switches, routers, or servers over a short 100GBASE-CR4 link, especially with Juniper JNP-100G-DAC-2M equipment.
Not ideal for: Buyers needing a longer-distance connection, a 3 m run, or a breakout from QSFP28 to four SFP28 ports.
- Cable type:Passive copper twinax
- Connector type:QSFP28 to QSFP28
- Data transfer rate:100 Gb/s
- Length:2 meters (6.5 feet)
- Wire gauge:30 AWG
- Compatible device:Juniper JNP-100G-DAC-2M
- Recommended use:Data-center connectivity
- Usage:Indoor and outdoor
Our verdict“Choose this for a short Juniper-listed 100GBASE-CR4 link, after confirming the cable is supported by both endpoints.”
10Gtek 100G QSFP28 to 4×25G SFP28 Passive DAC Breakout Cable, 3 m
Unlike the other three cables here, this is not a direct QSFP28-to-QSFP28 link: it takes one 100G QSFP28 port to four 25G SFP28 ports. That makes it the lineup’s specialized choice for dividing a high-speed switch port among four compatible 25G connections, with a 3 m length that offers more routing room than the 1 m Mellanox cable or either 2 m direct-attach option. Its passive 30 AWG twinax construction is meant for short links, and compatibility with Cisco QSFP-4SFP25G-CU3M is specified. The main tradeoff is port and device dependence: buyers need a supported breakout configuration at both ends, not just a free QSFP28 port. It cannot replace a standard QSFP28-to-QSFP28 DAC when the goal is a single 100G connection.
Pros:- Connects one 100G QSFP28 port to four 25G SFP28 ports
- 3 m length provides more routing reach than the 1 m Mellanox cable
- Cisco QSFP-4SFP25G-CU3M compatibility is specified
- Individually tested on switches before delivery
Cons:- Requires compatible breakout support and four suitable SFP28 ports
- Passive copper design is limited to short links
- Cannot serve as a standard QSFP28-to-QSFP28 100G cable
Best for: Network teams that need to connect one compatible 100G QSFP28 port to four 25G SFP28 ports within or between adjacent racks.
Not ideal for: Buyers seeking a direct 100G QSFP28-to-QSFP28 cable, or anyone whose switches do not support the required breakout configuration.
- Cable type:Passive direct attach copper twinax
- Connectors:QSFP28 to 4× SFP28
- Data rate:100 Gb/s
- Length:3 meters (10 ft)
- Wire gauge:30 AWG
- Standard temperature range:0–70 °C
- Industrial temperature range:-20–80 °C
- Compatible device:Cisco QSFP-4SFP25G-CU3M
Our verdict“Buy this breakout cable when your switch configuration needs four 25G links from one compatible QSFP28 port, not for a single 100G-to-100G connection.”
How We Picked
I ranked these cables around the decisions that matter for a 100G QSFP28 connection: supported link format, stated host compatibility, length, and intended topology. Standard passive DACs are judged as short, direct connections between QSFP28 ports; the breakout cable is evaluated separately because it fans one port out to four 25G connections. Product names that identify Cisco, Juniper, or Mellanox compatibility earn a clearer role for buyers with those platforms, though a compatibility claim does not replace checking the exact switch or NIC support list.
The ordering favors versatility for common short-link setups before narrower needs such as a particular host, a two-cable pack, or breakout wiring. I also distinguish cable lengths rather than treating longer as automatically better: short cables reduce slack in adjacent-port layouts, while longer ones offer more routing room but can be harder to manage. Since the listings do not provide a consistent basis for comparing measured performance or construction details across every model, I avoid claiming test results and rank by the use case each listing supports.
| qsfp28 dac cables 100g | Connectors |
|---|---|
| 10Gtek 100G QSFP28 Passive DAC | QSFP28 to QSFP28 |
| 10Gtek 100G QSFP28 DAC Cable | — |
| 10Gtek 100G QSFP28 Passive DAC | QSFP28 to QSFP28 |
| 10Gtek 100G QSFP28 to QSFP28 P | QSFP28 to QSFP28 |
| 10Gtek 100G QSFP28 Passive DAC | QSFP28 to QSFP28 |
| 10Gtek 100GBASE-CR4 QSFP28 to | QSFP28 to QSFP28, male-to-male |
| 10Gtek 100Gb/s QSFP28 Passive | QSFP28 to QSFP28, male-to-male |
| 10Gtek 100GBASE-CR4 QSFP28 Pas | QSFP28 to QSFP28, male-to-male |
| Wiitek 100GbE QSFP28 DAC Twina | — |
| 10Gtek 100G QSFP28 Passive DAC | QSFP28 to QSFP28 |
| 10Gtek 100G QSFP28 Passive DAC | QSFP28 to QSFP28 |
| 10Gtek 100Gb/s QSFP28 Passive | — |
| 10Gtek 100G QSFP28 Passive DAC | — |
| 10Gtek 100G QSFP28 to 4×25G SF | QSFP28 to 4× SFP28 |
Factors to Consider When Choosing Qsfp28 Dac Cables 100g
Before choosing a cable, I would match the port layout, device support, and link design rather than shopping by the 100G label alone. The following checks help prevent common mismatches that a product name or nominal speed cannot resolve.
Match the Cable Length to the Actual Route
Measure the path between ports, including the curve needed to route around rails and cable managers. A 0.5 m cable keeps adjacent devices tidy, but may be too short if ports sit on opposite sides of a rack or require a service loop. One meter is often easier to route without leaving as much slack as a 2 m or 3 m cable. Extra length can press against neighboring cables and complicate airflow or maintenance. Do not buy the longest option as insurance if the route is direct; choose enough slack for safe bends and access.
Check Compatibility at Both Ends
A QSFP28 connector and a 100G label do not prove that a switch and NIC will accept a given DAC. Check the platform documentation for supported passive DACs, port speed, and any cable coding restrictions. A model labeled Cisco, Juniper, or Mellanox-compatible can help narrow the search, but the listing may not cover every device generation or firmware configuration. If the two ends come from different vendors, verify support on both sides rather than assuming that one compatible label settles the question. For a production link, confirm the exact part requirements with the equipment vendor before ordering.
Choose Passive Copper for the Right Distance
Passive DACs are intended for short connections between nearby equipment, where a single copper assembly can replace separate optics and fiber. Their fixed length limits where devices can sit, so they are not a general replacement for optical links across a room, row, or building. If a route is longer than the supported passive-cable reach for your hardware, compare active copper or optical transceivers and fiber instead. Avoid extending a passive link with couplers or other improvised joins; those add connection points and do not change the cable’s supported reach. The right medium depends on distance, equipment support, and routing—not just the desired data rate.
Decide Whether You Need a Straight Link or Breakout
A QSFP28-to-QSFP28 DAC joins two compatible 100G ports as a single link. A QSFP28-to-4×25G breakout cable serves a different purpose: it connects one QSFP28 port to four SFP28 endpoints when the switch and configuration support that mode. Check port breakout capabilities, lane configuration, and the far-end port types before choosing the fanout cable. A breakout is not a faster or more flexible version of a standard DAC; it changes how bandwidth is divided across connections. If your network design calls for one 100G peer connection, choose a straight cable.
Plan Cable Count and Rack Maintenance
For several adjacent links, a two-pack can simplify procurement and leave a matching spare, while a single cable avoids buying an extra connection you may not use. Think about labeling, removal, and access to neighboring ports as well as initial installation. Dense front panels can become difficult to service when cables are too long or bundled tightly across ports. Leave enough room to unplug a cable without pulling on another link, and label both ends with the device and port. A small amount of routing discipline can make later fault-finding much faster.
Frequently Asked Questions
Will any QSFP28 DAC cable work with my 100G switch and NIC?
No. Matching connector type and advertised data rate is only the starting point; each device must support the cable’s passive DAC format and any vendor-specific coding. Check the documentation for both the switch and the NIC, especially when the endpoints come from different manufacturers. The lineup includes listings marked for Cisco, Juniper, and Mellanox, which can help focus a search but do not confirm support for every model. If the link is business-critical, verify the exact cable compatibility before deployment.
Should I choose a 0.5 m, 1 m, 2 m, or 3 m cable?
Choose by the measured route, not by a general preference for shorter or longer cables. Half a meter suits ports close together, while 1 m provides more slack for modest routing around equipment. The 2 m and 3 m choices are better when the route spans more rack space, but extra cable can crowd a dense panel. Account for bends, cable guides, and access for removal before deciding. If the required route exceeds the passive DAC’s supported reach, compare optical or other supported link options instead.
Does a Cisco-, Juniper-, or Mellanox-compatible label guarantee that the cable will work?
No label can guarantee compatibility with every device sold by that vendor. Support can vary by switch or NIC model, port configuration, and firmware, and mixed-vendor links may have requirements at both ends. Treat the compatibility wording as a useful filter, then check the hardware documentation for the exact platform and cable type. If you cannot confirm support, ask the equipment vendor or cable supplier before installing the link. This check is more useful than relying on the 100G rating alone.
When should I choose the QSFP28-to-4×25G breakout instead of a standard DAC?
Choose the breakout when one QSFP28 port needs to connect to four separate 25G SFP28 ports and the host supports that port mode. It is not the right choice for a single 100G link between two QSFP28 ports; use a straight QSFP28-to-QSFP28 DAC for that topology. Confirm that the switch can configure the port as four lanes and that each destination supports the required 25G connection. Also check the physical layout, since four fanout ends need room and clear port labeling. The cable changes the connection arrangement, so plan it against the network design.
When is passive copper a poor choice for a 100G connection?
Passive copper is a poor fit when the devices are farther apart than the cable and host combination supports, or when the route requires a different medium. It can also be unsuitable if a switch or NIC does not support passive DACs or the cable’s coding. For longer paths, compare supported active copper or optical transceiver-and-fiber options rather than forcing a short-reach cable into a long route. Consider equipment compatibility and installation layout along with distance. A cable that fits the port physically may still be wrong for the link.
Conclusion
For most buyers connecting two nearby 100G QSFP28 ports, I would start with the 10Gtek 1 m passive DAC as the best overall balance. The 0.5 m 2-pack is my best value-style choice for multiple short links, while the listings do not provide enough consistent evidence to name a distinct premium model on build or performance alone. For beginners, the straightforward QSFP28-to-QSFP28 1 m cable is the easiest starting point once device support is confirmed. Buyers with Cisco, Juniper, or Mellanox equipment should prioritize the matching compatibility-labeled option and check the exact platform documentation. For a one-to-four 100G-to-25G layout, choose the QSFP28-to-4×25G breakout; for distances beyond passive copper’s supported reach, look at optical alternatives instead.
