EX4100-48P: 48-Port Gigabit PoE+ Access Switch
The Juniper EX4100-48P is the proven PoE+ workhorse of the EX4100 line. Built for traditional 1GbE campus and edge access where standard 30W-per-port PoE is the right power envelope for IP phones, Wi-Fi 5/6 access points, IP cameras, and other conventional PoE endpoints. 48 ports of 10/100/1000BASE-T with IEEE 802.3at PoE+ and a 1440W total budget cover the bulk of mainstream campus access without the cost premium of PoE++ hardware that goes unused. As part of the
Juniper EX4100 Series, the 48P delivers full feature parity with the multigig 48MP at conventional 1GbE access speeds — Mist cloud automation, EVPN-VXLAN to access, MACsec encryption — at the price point that fits standard campus refresh budgets.
At a Glance
- Access ports: 48 x 10/100/1000BASE-T PoE+ access ports
- PoE budget: 1440W (with dual PSUs)
- Uplinks: 4 x 1/10GbE SFP+ + 4 x 10/25GbE SFP28
- Switching capacity: 188 Gbps unidirectional / 376 Gbps bidirectional, 279 Mpps forwarding
- Form factor: 1U, 920W AC AFO (front-to-back airflow)
- Cloud management: Juniper Mist Wired Assurance + Marvis AI Assistant
Why the 48P is the right fit for mainstream campus access:
- Standard PoE+ at 30W per Port: IEEE 802.3at delivery covers the overwhelming majority of installed PoE devices: IP phones, Wi-Fi 5 and 6 APs, single-radio mesh nodes, standard IP cameras, building IoT.
- 1440W Total PoE Budget: Dual-PSU operation supports 48 ports of mixed-class PoE+ devices with budget headroom. Most campus closets do not need more.
- Same Switching Capacity as 48T: 188 Gbps and 279 Mpps. Identical switching engine to the non-PoE 48T. The SKU difference is at the PoE controller and PSU layer.
- Cost Discipline vs Multigig Models: Comparable price to legacy 48-port PoE+ access switches, with EX4100 software stack and Mist automation included.
- Direct Refresh from EX2300/EX3400: Drop-in replacement for older Juniper 48-port PoE+ access switches with same port count, similar PoE budget, and forward-compatible feature set.
- Same Uplinks as the Rest of the Line: 4 x 1/10GbE SFP+ and 4 x 10/25GbE SFP28. Identical uplink config to the 48MP, 48T, and 24MP.
PoE+ Power for Standard Campus Endpoints
The 48P is the right answer when the campus endpoint mix is dominated by IP phones, Wi-Fi 5/6 access points, and standard IP cameras. Devices that fit comfortably inside the IEEE 802.3at 30W envelope. Choosing PoE+ over PoE++ at refresh time saves hardware cost and avoids paying for power headroom that never gets consumed during the access-port lifetime.
- 30W Per Port (802.3at Type 2): Covers every IP phone, Wi-Fi 5/6 AP, standard IP camera, building-control device, and POL endpoint shipped in volume over the last decade.
- 1440W Dual-PSU Budget: Sufficient for 48 fully-loaded PoE+ devices at typical mixed-class draw. Single-PSU operation still supports 740W. Enough for half the chassis at full draw.
- Fast PoE Boot: Powered devices come online within seconds of switch power restoration. Minimizes closet-maintenance downtime impact.
- Per-Port LLDP Negotiation: 802.3at LLDP power negotiation lets endpoints declare the wattage they actually need, freeing budget for higher-class devices on the same chassis.
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Switching Capacity for Standard 1GbE Access
The 48P uses the same switching engine as the 48T, sized for 48 x 1GbE access ports plus the uplinks. 188 Gbps unidirectional, 279 Mpps L2/L3 forwarding, non-blocking architecture. Switching headroom is not the design challenge for a 1GbE access switch — sizing PoE budget and uplink capacity is.
- 188 Gbps Unidirectional / 376 Gbps Bidirectional: Non-blocking architecture for all 48 access ports plus uplinks at full rate concurrently.
- 279 Mpps L2/L3 Forwarding: Hardware-accelerated forwarding identical to the 48T. Switching engine differences between SKUs are at the PoE and PSU layer, not the data path.
- 25GbE SFP28 Stacking: 4 ports flex between Virtual Chassis stacking (25GbE per link) and Ethernet uplinks. Most 48P closet deployments use them for stacking.
- 10GbE SFP+ Northbound: 4 always-on uplinks for distribution-layer connectivity. Plenty of headroom for 1GbE-aggregated traffic from 48 access ports.
Hardware for Standard Campus Closets
Built for mainstream campus wiring-closet deployments: patching to IP phones, Wi-Fi 5/6 APs, standard cameras, and conference-room AV. Dual hot-swappable 920W PSUs, front-to-back airflow, and a 64.1 CFM thermal envelope match standard closet HVAC and rack patterns.
- 1U Standard Form Factor: 10.27 lb (4.66 kg) chassis, front-accessible ports. Drop-in compatible with legacy 1U PoE+ switch slots.
- Dual 920W AC PSUs: Hot-swappable for service without dropping the closet. Either PSU alone handles 740W PoE budget.
- 64.1 CFM Cooling: Front-to-back airflow aligned with standard closet HVAC. AFI back-to-front variant available for non-standard rooms.
- Field-Replaceable Fan Modules: Two fans, redundant operation. Single-fan failure does not force chassis replacement.
- 0 to 45 C Operating Range: Tolerates non-AC IDFs and remote sites with marginal cooling. Same envelope as the rest of the EX4100 line.
Security and Fabric Integration
Security and fabric features are consistent across the EX4100 line — the same MACsec, EVPN-VXLAN microsegmentation, and Junos-driven access control as the larger Juniper enterprise switching portfolio.
- MACsec AES-256: Line-rate switch-to-switch encryption on supported ports, securing traffic between access and distribution layers.
- EVPN-VXLAN to Access: Extend campus fabric segmentation end-to-end with group-based policies and consistent traffic isolation per device class.
- 802.1X Access Control: Port-based authentication, MAC authentication, RADIUS-driven dynamic VLAN assignment, and Voice VLAN support.
- Control-Plane Protection: CoPP, DHCP snooping, dynamic ARP inspection, IP source guard, and DDoS protection mitigate Layer 2/3 attacks.
Where the 48P Fits
Three deployment patterns where this SKU is the right cost-rational choice for standard PoE+ campus access.
Traditional Campus Refresh
Floor-by-floor refresh of office or institutional buildings still running Wi-Fi 5 or first-gen Wi-Fi 6 APs and IP phones. 48P fits every existing PoE+ device without paying for unused 90W headroom.
IP Phone Aggregation
Per-closet aggregation of desk phones and conference-room phones. Exactly the workload PoE+ was designed for. Voice VLAN, LLDP-MED, and 802.1X authentication built in.
IP Camera and Building Automation Closets
Standard IP cameras (excluding very-high-draw PTZ models), card readers, building-control modules. All comfortably inside the 30W envelope.
Where the 48P Earns Its Slot
Verticals where the device population is dominated by standard PoE+ endpoints and PoE++ would be unnecessary spend.
- K-12 and Higher Education Classrooms: Wired ports in every classroom plus ceiling-mounted Wi-Fi 5/6 APs and IP cameras. 48P fits the device profile and the public-budget price point.
- Government Offices: Standard desk-with-phone-and-AP closets. Predictable PoE+ device population, lifecycle-friendly refresh path from legacy Juniper EX-series.
- Retail Back-of-House: IP phones at staff stations, ceiling APs, point-of-sale terminal NICs, security cameras. Every device fits inside the PoE+ envelope.
- Standard Corporate Floors: Cubicles with IP phones, conference rooms with standard APs and PTZ-light cameras. The mainstream campus access role.
Regulatory Compliance
The Juniper EX4100 line complies with major environmental and safety standards across all SKUs, enabling global deployments and sustainable lifecycle management.
- RoHS: Restriction of Hazardous Substances compliance.
- REACH: EU regulatory compliance for chemical-substance registration and authorization.
- WEEE: Waste Electrical and Electronic Equipment Directive for responsible recycling and end-of-life handling.
EX4100-48P vs. Other Juniper EX4100 Models
The EX4100 line includes four access switch models — here is how this one compares when picking the right platform.
Juniper EX4100-48P (this model)
- Access Ports: 48 x 10/100/1000BASE-T PoE+ access ports.
- PoE Budget: 1440W (with dual PSUs).
- Best Use Case: Traditional 1GbE campus deployments where PoE+ at 30W per port covers IP phones, Wi-Fi 5/6 APs, and standard IP cameras.
Juniper EX4100-48MP
- Access Ports: 16 x 100M/1/2.5GbE + 32 x 10M/100M/1GbE PoE++ access ports.
- PoE Budget: 1620W (with dual PSUs).
- Best Use Case: High-density Wi-Fi 6/6E, IoT-heavy campuses, and smart buildings needing PoE++ across a full 48 ports with multigigabit headroom on 16 of them.
Juniper EX4100-24MP
- Access Ports: 8 x 100M/1/2.5/5/10GbE + 16 x 10M/100M/1GbE PoE++ access ports.
- PoE Budget: 1440W (with dual PSUs).
- Best Use Case: Smaller IDFs, branch sites, and focused AP/IoT deployments where multigigabit (up to 10GbE on copper) is required at lower port density.
Juniper EX4100-48T
- Access Ports: 48 x 10/100/1000BASE-T access ports (no PoE).
- PoE Budget: N/A.
- Best Use Case: Cost-efficient campus and branch access where endpoints do not need PoE.
For broader Juniper switching options, browse the full
Juniper EX Series catalog, or compare against the newer-generation
EX4400 Series for higher-density multigigabit deployments.
Get the 48P in Stock
For mainstream campus access where the device mix is IP phones, Wi-Fi 5/6 APs, standard IP cameras, and conventional PoE+ endpoints — and PoE++ headroom would go unused — the
EX4100-48P is the cost-rational Juniper choice. BrightStar Systems supplies tested, refurbished 48P units with documented condition reports and US-stock availability. Our team can map the 48P refresh path from legacy EX2300, EX3400, or third-party PoE+ access switches and confirm PoE budget against your installed device population.
Q: Does the EX4100-48P support PoE++ at 90W, or only standard PoE+?
A: The 48P supports IEEE 802.3at PoE+ delivering up to 30W per port — not the higher PoE++ (802.3bt) standard. If you need 90W PoE++ for Wi-Fi 6/6E APs, PTZ cameras with heaters, or building-IoT controllers, the EX4100-48MP is the SKU to pick.
Q: What types of devices fit within the 30W per-port limit?
A: PoE+ at 30W covers the overwhelming majority of installed PoE devices: IP phones, Wi-Fi 5 and standard Wi-Fi 6 APs, single-radio mesh nodes, standard IP cameras (excluding very-high-draw PTZ models), card readers, and most building-control modules.
Q: Can I run Wi-Fi 6E access points on the 48P?
A: Single-radio Wi-Fi 6E APs that fit within 30W will work on the 48P. Higher-draw 6E APs with tri-radio configurations or PoE++ requirements should be paired with the multigig PoE++ 48MP instead. Check your specific AP model’s PoE class before standardizing.
Q: How does the 48P compare to legacy EX2300 or EX3400 PoE+ switches?
A: The 48P is a drop-in successor: same 48-port 1GbE PoE+ profile, similar PoE budget, but with the EX4100 software stack (Mist cloud automation, Marvis AI Assistant, EVPN-VXLAN to access, MACsec AES-256). Refresh path is straightforward — port density and PoE budget map directly.
Q: What’s the upgrade path if I later need PoE++ on the same closet?
A: Mix the 48P with an EX4100-48MP or 24MP in the same Virtual Chassis stack — the multigig PoE++ switch handles the high-draw devices, the 48P handles the standard PoE+ population. Both managed as one logical device through Juniper Mist.
