Ubiquiti USW-48-POE 48-Port Managed Switch
The Ubiquiti USW-48-POE is a 1U rack-mount managed switch purpose-built for access-layer deployments where port density and PoE power delivery matter more than raw throughput scaling. With 48 x 1GbE ports, 32 dedicated PoE+ ports, and a 195W maximum PoE output budget, this switch eliminates the need for external power injectors across most mid-to-large office, retail, and campus access networks. The 52 Gbps non-blocking switching fabric and 77 Mpps forwarding rate handle aggregated traffic from dozens of PoE-powered endpoints—IP cameras, wireless access points, and VoIP phones—without bottlenecks at the port level. Integration with Ubiquiti's UniFi controller ecosystem means centralized provisioning, monitoring, and firmware management across multi-switch deployments.
Key Features
- 48 x 1GbE Ports + 32 PoE+ Allocation: Delivers up to 30W per PoE+ port to high-draw endpoints like PTZ cameras and mesh access points. Powering 32 simultaneous PoE+ devices from a single switch reduces rack clutter and simplifies cabling—no separate PoE injectors or PSUs scattered across the deployment.
- 195W PoE Output Budget: Sufficient to run a full stack of 20–32 access points, or a mixed camera + AP topology, without external power infrastructure. Real-world benefit: fewer UPS circuits required, simpler power planning.
- Four 1G SFP Uplink Ports: Enables fiber connectivity to core switches or distant buildings without forcing a dual-switch fabric. Useful when copper runs exceed 100m or when you need electromagnetic isolation.
- 52 Gbps Non-Blocking Throughput: Sufficient for access-layer aggregation in enterprise networks. At the access layer, some oversubscription (4:1 or 8:1) is normal and expected; this switch's throughput is not a limitation for typical campus or office topologies.
- 1,000 VLAN Support: Provides traffic segmentation—isolate guest networks, camera VLANs, and management traffic without requiring a separate switch. Essential for security-conscious deployments.
- UniFi Controller Integration: Unified provisioning across multiple switches via centralized management. One dashboard for layer 2 configuration, monitoring, and troubleshooting across your entire site.
- NDAA Section 889 Compliance: Meets U.S. federal procurement restrictions for defense and critical-infrastructure projects. Pre-vetted for government and enterprise compliance workflows.
- Universal AC Input (100–240V, 50/60 Hz): Single power supply handles global deployments without voltage converters. 240W internal PSU, 45W idle draw (excluding PoE output).
- Operating Range –5°C to +40°C: Suitable for temperature-controlled data closets and small server rooms. Not rated for outdoor or unheated warehouse environments.
- 1U Form Factor, 4.5 kg: Compact footprint with SGCC steel construction. Mounting brackets included; installs in any standard 19-inch rack.
Integration & Compatibility
Management is Ethernet-based and integrates seamlessly with Ubiquiti's UniFi ecosystem. Standard Layer 2 protocols and VLAN tagging ensure compatibility with existing enterprise infrastructure and third-party ONVIF-compliant cameras. The USW-48-POE (often searched as USW 48 POE) supports firmware updates through the UniFi controller; factory reset restores management access if configuration is lost. Certifications include NDAA compliance, CE, FCC, IC, and Anatel, meeting North American and Brazilian regulatory requirements.
Deployment Scenarios
This switch excels in office buildings, retail chains, and small-to-medium campuses where consolidated PoE delivery reduces infrastructure complexity. Access point deployments spanning 20–32 devices benefit from unified power budgeting. Mixed IP camera and wireless LAN builds leverage VLAN isolation to segregate surveillance and production traffic. The four SFP uplinks are valuable when cabling distance or electromagnetic isolation demands fiber connectivity to a core switch.
When to Choose a Different Model
If your deployment requires more than 96 PoE ports, or demands higher throughput oversubscription ratios (lower than 4:1), step up to Ubiquiti's core-class or distribution-layer switches. Similarly, if you need advanced QoS, MPLS, or Layer 3 routing at the access edge, consider a higher-tier platform. For outdoor or unheated environments, verify that your enclosure solution accommodates the operating range of –5°C to +40°C; this switch is designed for climate-controlled closets.
Frequently Asked Questions
Q: Can the USW-48-POE power a full 48-port load of PoE+ devices?
A: No. The 195W total PoE budget supports a maximum of 32 simultaneous PoE+ ports (at 30W per port). The remaining 16 ports are data-only. Plan your PoE device count accordingly and configure VLAN isolation if needed to cap power draw on demand.
Q: Does the USW-48-POE require UniFi Dream Machine or standalone UniFi controller?
A: The switch integrates with Ubiquiti's UniFi Network platform, which includes cloud-hosted and self-hosted controller options. You do not require a Dream Machine; a standard UniFi controller or cloud key handles provisioning and monitoring.
Q: Is the USW-48-POE NDAA Section 889 compliant?
A: Yes. The product meets NDAA compliance and includes certification documentation (00593-21-08356) for federal procurement workflows.
Q: What is the latency and switching capacity?
A: The switch delivers 104 Gbps aggregate switching capacity, 52 Gbps non-blocking throughput, and 77 Mpps forwarding rate. Latency is not specified in the datasheet; contact the manufacturer if sub-millisecond switching latency is critical for your application.
Q: Can I use fiber uplinks without a media converter?
A: Yes. The four 1G SFP uplink ports support direct fiber connectivity. You will need compatible 1G SFP transceivers (not included); sourcing is straightforward from third-party suppliers.
Q: Does the USW-48-POE support stacking or clustering?
A: No dedicated stacking hardware is mentioned in the documentation. Multiple switches are managed as separate units via the UniFi controller; fabric redundancy requires layer 3 loop prevention or spanning tree.
Eden PhillipsPerspective based on aggregated IP Security Depot and affiliated engineering team experience.
The Ubiquiti USW-48-POE strikes a pragmatic balance between port density and power delivery that you'll find works well in mid-market and small campus settings. The 195W PoE budget across 32 ports is the real differentiator here—it eliminates cascading switches or external injectors for most access-layer topologies. I routinely spec this switch into office buildings and retail chains where you're powering 20–30 access points plus a handful of IP cameras.
Technical Highlights:
- 52 Gbps Non-Blocking Throughput: Adequate for access-layer aggregation where 4:1 oversubscription is acceptable. You'll see this spec on competing switches; the difference is that the USW-48-POE achieves it in 1U, which matters when rack space is tight.
- Four 1G SFP Uplinks: Fiber connectivity without a separate media converter. On mixed copper/fiber builds, this saves you a rack unit and simplifies uplink architecture. Many smaller access switches force you to choose between copper and fiber; Ubiquiti gives you both.
- 1,000 VLANs: Enterprise-grade segmentation in a compact form. I use this to isolate guest networks, camera traffic, and management in a single switch—reduces the need for a second appliance in smaller deployments.
Deployment Considerations:
- PoE Budget Math: 32 PoE+ ports @ 30W max = 960W theoretical, but your 195W budget caps simultaneous power. Plan for actual device draw, not maximum. A typical access point draws 10–15W; a PTZ camera can draw 25–30W. Oversizing here causes management headaches later.
- Operating Range: The switch handles –5°C to +40°C only. Do not install this in an unheated warehouse closet or outdoor enclosure without climate control. If thermal management is uncertain, clarify your facility specs before ordering.
- No Layer 3 Routing: This is a Layer 2 switch. If you need inter-VLAN routing, QoS, or BGP at the access edge, you'll need an additional device or a step up to a distribution-class platform.
I'd deploy the USW-48-POE (often searched as USW 48 POE) into a mixed office/campus environment where you're building out a wireless network and adding a few security cameras. The power budget and VLAN isolation handle that cleanly. If you're scaling beyond 96 PoE ports or need core-class throughput and redundancy, look at Ubiquiti's higher-end line. But for access-layer density and simplicity, this one delivers.
