Juniper · New & refurbished
Juniper QFX5120-48Y switch
The datacenter workhorse: 48x 1/10/25GbE and 8x 100GbE uplinks in 1U, built for EVPN-VXLAN leaf and spine. Available with AFI and AFO airflow.
Juniper QFX5120-48Y25G leaf for modern datacenters
The QFX5120-48Y is one of the most deployed 25G top-of-rack switches in hosting and enterprise datacenters. It supports EVPN-VXLAN fabrics, 2-member Virtual Chassis and rich L2/L3 features on Junos OS.
Typical use: server leaf (10/25GbE), small spine or aggregation, storage networks and colocation customer edge.
AFI or AFO? AFO (front-to-back) pulls air in at the port side; AFI (back-to-front) pulls air in at the PSU side. Choose to match your hot/cold aisle layout. The fan modules and PSUs must all match the chassis airflow.
Key specifications
| Form factor | 1U |
|---|---|
| Ports | 48x SFP28 (1/10/25GbE) + 8x QSFP28 (40/100GbE) |
| Throughput | 4 Tbps bidirectional, 2 Bpps |
| CPU / memory | Quad-core Intel 2.2 GHz, 16 GB DRAM, 50 GB SSD |
| Power | 2 hot-swappable 650 W PSUs (1+1), AC or DC |
| Cooling | 5 fan modules (4+1), AFI or AFO |
| Virtual Chassis | Up to 2 members |
Part numbers we supply
| Part number | What it is |
|---|---|
QFX5120-48Y-AFO / -AFO2 | AC, front-to-back airflow |
QFX5120-48Y-AFI / -AFI2 | AC, back-to-front airflow |
QFX5120-48Y-DC-AFO2 / -DC-AFI2 | DC power variants |
JPSU-650W-AC-AO / -AI | Spare AC power supplies (AFO / AFI) |
QFX5110-FANAFO / -FANAFI | Spare fan modules (AFO / AFI) |
The -AFI2/-AFO2 part numbers are the current versions of the same platform.
What you get from VelinQ
Tested on Junos
Every refurbished unit is powered up, checked for alarms and tested before shipping. Configuration is zeroized.
Warranty
Minimum 12 months for end users, with clear RMA handling.
Serials documented
Serial numbers are recorded per unit and listed on your invoice.
Fast shipments
Fast shipments and good availability.
Frequently asked questions
Can a QFX5120-48Y be converted from AFI to AFO?
Airflow is determined by the fan modules and power supplies, which must all match. Conversion is possible by replacing fans and PSUs; we can supply the parts or deliver the switch in the airflow you need.
Which software does it run?
Junos OS. We can deliver units on a Junos release that suits your network; tell us your target version.
Do you have QFX5120-32C and QFX5120-48T as well?
Yes, we regularly supply other QFX5120 variants. Send us the part numbers you need.
Looking for Juniper QFX5120-48Y switches?
Send us the part numbers, quantity, condition (new or refurbished) and delivery country. You'll get a firm offer from a Juniper specialist, usually within one business day.
VelinQ Networks is an independent reseller and not an authorized Juniper Networks partner. Juniper, Junos and product names are trademarks of Juniper Networks, Inc. Software licensing and Juniper support contracts are subject to Juniper's own policies. Specifications are based on Juniper's published documentation; always confirm against the current datasheet for your use case.