Juniper 920W AC AFO Hot-Swap Power Supply for EX3400

The Juniper JPSU-920-AC-AFO is a 920-watt AC power supply with front-to-back (AFO) airflow and hot-swap capability for the Juniper EX3400 series access switches — providing N+1 redundant power for EX3400 PoE deployments with standard hot-aisle/cold-aisle airflow direction for data center and wiring closet rack configurations.

Key Features

• 920W AC power for Juniper EX3400 — supports full PoE+ budget in redundant configurations
• AFO (Front-to-Back / Airflow Out) for hot-aisle exhaust rack deployments
• Hot-swap for non-disruptive PSU replacement without switch downtime
• N+1 redundancy when paired with a second JPSU-920-AC-AFO in EX3400
• Juniper-genuine for EX3400 firmware and power management compatibility

Product Specifications

• Part Number: JPSU-920-AC-AFO
• Manufacturer: Juniper Networks
• Power Output: 920W
• Input: AC (100–240V universal)
• Airflow: AFO (Front-to-Back)
• Compatible System: Juniper EX3400 series switches
• Hot-Swap: Yes

Power & Electrical Specifications

• AC Input Range: 100–240V AC, 50/60Hz
• Output: 12V DC to EX3400 system
• Efficiency: 80 PLUS rated
• Max Current: 76.7A at 12V
• Connector: EX3400 proprietary PSU interface
• MTBF: 200,000+ hours

Use Cases

• N+1 redundant PSU installation in Juniper EX3400 for power supply redundancy
• Replacement of failed or aging PSU in Juniper EX3400 access switches
• AFO airflow for front-to-back cooling in standard hot-aisle/cold-aisle wiring closet racks
• High-PoE EX3400 deployments requiring 920W for full PoE+ port budget

Compatibility

• Juniper EX3400 series switches (EX3400-24T, EX3400-24P, EX3400-48T, EX3400-48P, EX3400-48T-DC)
• AFO airflow — not compatible with AFI (Back-to-Front) rack configurations
• For AFI airflow, use JPSU-920-AC-AFI instead
• Verify EX3400 model PSU bay compatibility before ordering

Frequently Asked Questions

What is the PoE budget of the EX3400 with a single JPSU-920-AC-AFO?

A single 920W PSU supports the EX3400's PoE budget for typical mixed-device deployments. For maximum PoE+ utilization across all 48 ports at full 30W each (1440W total), dual PSUs are required. Consult Juniper's EX3400 power budget calculator for your specific port loading.

Is the JPSU-920-AC-AFO interchangeable with JPSU-1050-C-AC-AFO?

No — the JPSU-920-AC-AFO is for EX3400 switches, while the JPSU-1050-C-AC-AFO is for EX4400 switches. Both use different chassis PSU connectors and are platform-specific — verify your switch model before ordering.

What happens if one PSU fails in a dual-PSU EX3400?

With dual JPSU-920-AC-AFO units installed, the EX3400 operates in N+1 redundancy mode. If one PSU fails, the second PSU takes over full load automatically with no traffic interruption. The failed PSU can then be hot-swapped without powering down the switch.

The Juniper JPSU-920-AC-AFO provides the 920W AC hot-swap power redundancy and front-to-back airflow compatibility that EX3400 PoE deployments require — enabling N+1 power supply protection, live PSU replacement, and proper thermal management for wiring closet and data center EX3400 access switching installations.