Ubiquiti UACC-UPLINK-SFP28-0.3M 25GBase Direct Attach Cable
Overview
The Ubiquiti UACC-UPLINK-SFP28-0.3M is a passive copper direct attach cable (DAC) engineered for short-reach, high-speed interconnects within UniFi network infrastructure. At 1 foot in length, it eliminates the cost and latency overhead of optical transceivers and fiber optic modules — a real advantage when stacking UniFi switches or building collapsed backbone topologies in data centers and larger enterprise networks. The cable supports automatic link optimization across 1G SFP, 10G SFP+, and 25G SFP28 port types, meaning you can deploy it without worrying about speed negotiation or port compatibility issues across mixed generations of equipment.
Key Features
- 25GBase Copper Interconnect: Delivers 25 Gbps throughput over passive copper at short range (0.3 meters / 1 foot), eliminating transceiver cost and power draw. Meaningful savings in uplink fabric deployments where every interconnect matters.
- Auto-Sensing Port Compatibility: Works with SFP28, SFP+, and 1G SFP ports without manual speed configuration. Simplifies mixed-speed environments where older and newer UniFi equipment coexist.
- Zero Latency Overhead: Passive design introduces no processing delay — signal travels directly copper-to-copper. Matters for latency-sensitive applications like high-frequency trading, real-time analytics, or campus backbone consolidation.
- Datacenter-Grade Passive Design: No power consumption, no firmware to manage, no transceivers to fail. Reduces operational complexity in stacked or modular UniFi deployments.
- Short-Reach Optimized: 0.3 meter length is purpose-built for equipment-to-equipment uplink connections — patch panel runs, adjacent rack interconnects, or switch stacking. Not suitable for long-distance runs (optical cable required beyond 5–10 meters depending on copper gauge and environment).
- UniFi Equipment Compatibility: Designed for Ubiquiti UniFi switches and modular systems with SFP28 uplink ports. Verify port type on your specific switch model before ordering.
Integration & Compatibility
The UACC-UPLINK-SFP28-0.3M integrates directly into any Ubiquiti UniFi switch or modular system equipped with SFP28 uplink ports. It works with stacked deployments where you're binding multiple switches into a single switching fabric, and supports datacenter-grade switching architectures. The cable is passive — no power, no configuration required beyond plugging in both ends.
Deployment context: Use this for short uplinks between adjacent equipment in the same rack or nearby cabinet. If you need distances beyond 5–10 meters, or if your network uses SFP28 ports that require longer runs, optical DACs or fiber optic transceivers and cabling are more appropriate and will save you troubleshooting time.
Frequently Asked Questions
Q: What is the maximum distance for the UACC-UPLINK-SFP28-0.3M?
A: This cable is rated for 0.3 meters (approximately 1 foot). It is a short-reach interconnect designed for equipment-to-equipment or adjacent rack connections. Distances beyond 5–10 meters require optical transceivers and fiber cabling.
Q: Does the UACC-UPLINK-SFP28-0.3M work with non-Ubiquiti switches?
A: The cable is a standards-compliant SFP28 direct attach passive copper cable, so it may work with other equipment featuring SFP28 ports. However, compatibility is not officially documented. Test with your specific hardware or contact the equipment manufacturer.
Q: Can I use this cable for longer distances if I need to?
A: No. Passive copper DACs have distance limitations. For runs beyond 5–10 meters, use optical fiber with SFP28 transceivers. Passive copper cables longer than 10 meters risk signal degradation and link failures.
Q: Does the UACC-UPLINK-SFP28-0.3M require any power or configuration?
A: No. It is a passive cable — no power input, no firmware, no configuration. Insert both ends into compatible SFP28 ports and the link negotiates automatically.
Q: What are the speed negotiation modes supported?
A: The cable supports auto-sensing across 1G SFP, 10G SFP+, and 25G SFP28 speeds. Equipment on both ends will negotiate the highest common speed automatically.
Q: Is this cable suitable for stacked UniFi switches?
A: Yes. The UACC-UPLINK-SFP28-0.3M is explicitly designed for UniFi switch stacking and uplink interconnect fabric deployments, provided both switches have compatible SFP28 ports.
Ted PerryPerspective based on aggregated IP Security Depot and affiliated engineering team experience.
Direct attach cables are one of the most overlooked cost and complexity savers in data center uplink design. The UACC-UPLINK-SFP28-0.3M is straightforward: it's a passive, zero-power copper interconnect rated for 25 Gbps over a 1-foot span. That 0.3-meter length is the critical spec — it's short enough for adjacent switch stacking or rack-to-rack uplinks, but long enough to avoid awkward positioning.
Technical Highlights:
- 25 Gbps Passive Copper: No transceiver cost, no power draw, no firmware updates. The cable itself is the entire link. Saves roughly $150–300 per port compared to buying SFP28 optical transceivers and fiber, and introduces zero processing latency.
- Auto-Sensing 1G/10G/25G: Negotiates speed automatically across three generations of SFP port types. Useful when you have mixed-age UniFi hardware and you want one cable that works everywhere without guessing which speed slot you've plugged into.
- 0.3 Meter Fixed Length: Not customizable. For your use case, this is either exactly right or completely wrong — there's no middle ground. Verify the physical distance between your uplink ports before committing.
Deployment Considerations:
- Passive copper DACs are distance-limited. Beyond 5–10 meters, signal integrity degrades sharply. If your uplinks are across multiple racks or different rooms, switch to optical transceivers and fiber immediately — don't guess.
- Verify that both endpoints support SFP28 ports. Many older UniFi switches top out at 10G SFP+ or 1G SFP. Check your switch datasheets; an incompatible port type means the cable won't seat or link at all.
- Passive cables are prone to bend-related failures if pinched or sharply kinked during installation. Route carefully through your cable management.
Best fit: UniFi switch stacking, collapsed backbone uplinks, and short-reach datacenter fabric where you need 25 Gbps interconnect without the cost or complexity of transceiver licensing and optical cabling. If your network is spread across distances, or if you're mixing equipment from different vendors that don't guarantee SFP28 compatibility, save yourself the troubleshooting time and go optical.
