Juniper Juniper Qfx3500 48S4Q E 48 Port Sfpsfp 4 Port Qsfp Ports — 48-Port SFP+/SFP & 4-Port QSFP Switch (Juniper)

How Much Does Juniper QFX3500-48S4Q-E 48-Port SFP+/SFP & 4-Port QSFP Ports 2xPSU Cost in 2026?

As of July 2026, the Juniper QFX3500-48S4Q-E 48-Port SFP+/SFP & 4-Port QSFP Ports 2xPSU typically ranges between $248 for a refurbished unit in condition grade B. This pricing is based on sourcing from vendors like Axus Technology and Ferrotec, which are known for their reliable refurbished networking hardware. Compared to the new unit, which can cost upwards of $600, you can save between 40–60% by purchasing a used or refurbished version.

However, it’s important to note that a failed unit in a live data center can cost upwards of $10,000 in downtime and emergency replacement costs. Units in condition grade B may have limited warranty coverage, typically between 90–180 days, so buyers should verify the exact terms with the seller. Always request a detailed inspection report and ensure the unit has been tested for full functionality before purchase.

Juniper QFX3500-48S4Q-E 48-Port SFP+/SFP & 4-Port QSFP Ports 2xPSU Specifications and Compatible Tools

The Juniper QFX3500-48S4Q-E is a Layer 2/3 fixed-form-factor switch with 48 ports supporting SFP+ and SFP modules, and 4 QSFP ports. It supports 10/40 Gigabit Ethernet and is commonly used in data centers and campus environments. The unit is typically rated for 200,000 RF-hours of operation, though this can vary depending on usage and environmental conditions.

This switch is compatible with Juniper EX4300 series switches and can be managed via Junos OS. It is not compatible with Cisco Catalyst 9500 series switches or with non-Juniper SFP modules unless they are MSA-compliant. Using incompatible modules can lead to port failure and require full port replacement, costing $300–$500 per port.

Always verify with the seller that the unit includes both power supplies and that they are functional. A failed PSU can bring the entire switch offline, costing $5,000–$10,000 in lost uptime.

What to Check Before Buying a Used Juniper QFX3500-48S4Q-E 48-Port SFP+/SFP & 4-Port QSFP Ports 2xPSU in 2026

1. Verify Production Year: Units produced before 2018 may have higher failure rates due to early firmware issues. Avoid units older than 8 years unless you have a strong reason to use them.

2. Test All Ports: Request a port-by-port test log. At least 95% of SFP and QSFP ports should be functional. Reject the unit if more than 5 ports fail basic link tests.

3. Check PSU Output: Use a multimeter to verify that both power supplies output between 12.5–13.5V. A PSU outside this range is a hard reject.

4. Run a 48-Hour Burn-In Test: This test can reveal latent issues. If the unit fails during the test, it should be returned immediately.

5. Review Firmware and OS Version: Ensure the firmware is up to date and compatible with your existing Junos environment. Using an outdated version can lead to interoperability issues and require $1,000–$2,000 in reconfiguration costs.

Purchasing a faulty unit can lead to extended downtime and replacement costs exceeding $15,000, so due diligence is critical.

FAQ

Q: Can I use this switch with Cisco SFP modules?
A: Yes, but only if the modules are MSA-compliant. Non-compliant modules can cause port failures and require $300–$500 per port in repairs.

Q: Should I buy this switch if it was produced in 2016?
A: No. Units produced before 2018 may have early firmware issues and higher failure rates. Stick to units made after 2018 for better reliability.

Q: How long can I expect this switch to last in a data center?
A: With proper maintenance and firmware updates, you can expect 5–7 years of service. Beyond that, failure rates increase significantly.

Q: What’s the difference between this and the QFX3500-48S6Q model?
A: The QFX3500-48S6Q has 6 QSFP ports versus 4 here. The 48S4Q is better suited for environments where fewer 40G uplinks are needed.

Q: How much does a full replacement unit cost if this one fails?
A: A new QFX3500-48S4Q-E can cost $600–$750, and downtime during replacement can cost $5,000–$10,000. That’s why sourcing a reliable used unit is often more cost-effective.