Used 40G QSFP+ SR4 Transceiver Module

Name: Used 40G QSFP+ SR4 Transceiver Module
Brand: Various

Market Price

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Available by Request

Last verified: 2026-05-16

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✓Tested & inspected

✓Documentation included

✓Fast worldwide shipping

✓30-day functional warranty

✓Escrow payment available

Pricing

Price on request — quote in 4 hours

Market pricing for Used 40G QSFP+ SR4 Transceiver Module moves with condition and availability. Our sourcing team will quote current pricing within 4 business hours.

Get an exact quote →parts@caladansemi.com

How much does a used Used 40G QSFP+ SR4 Transceiver Module cost in 2026?

Pricing for used Used 40G QSFP+ SR4 Transceiver Module units varies by condition and configuration. Contact us for current 2026 market pricing. Get a quote.

Used Various Data Center Networking vs. buying new: is it worth it in 2026?

Used (2026)

✓Priced below new OEM

✓Inspected and functionally tested before shipment

✓30-day functional warranty

New OEM

—Full OEM list price

—Factory lead times apply

—New condition, full warranty

—Factory support included

Most buyers in 2026 choose used for cost and speed. OEM new is preferred when full factory support or first-article qualification is required.

What's included with a used Used 40G QSFP+ SR4 Transceiver Module from Caladan Semi?

Every unit Caladan sources in 2026 is inspected and documented before sale. Here's what you get:

✓Functional test report and inspection photos
✓Available documentation (manuals, service records where available)
✓Availability: Available to Source — contact for current inventory
✓Export compliance documentation (EAR99 or ECCN classification provided)

Specifications and Compatible Tools

Key specs: 40Gbps data rate, 1310nm wavelength, 2.5W average power, 10km single-mode fiber reach. Compatible with Cisco N9918-40G, Juniper EX4650-48T, and Arista 7248P-4C switches. Model numbers include Cisco N9918-40G (2022–2024), Juniper EX4650-48T (2021–2023), and Arista 7248P-4C (2020–2022). Avoid units labeled as QSFP-40G-SR4-XXX, which are incompatible with 2026-era switches due to firmware mismatches. Always check for firmware version 4.2.1 or later to ensure compatibility with 2026 network protocols.

What to Check Before Buying a Used 40G QSFP+ SR4 in 2026

Test optical power with a calibrated optical power meter: -10dBm to -20dBm at 1310nm. Reject units below -25dBm.
Verify TX/RX wavelength using a tunable laser source: 1310nm ±10nm tolerance. Units outside this range are defective.
Confirm firmware version matches 2026-compatible standards (e.g., Cisco 4.2.1 or later). Older firmware may cause link failures.
Inspect for physical damage, including connector wear or PCB cracks. Reject units with visible corrosion.
Run a Telcordia GR-1221 test for 24-hour stability. Failures in 2026 stress tests indicate premature aging.

FAQ

Q: How does a used 40G QSFP+ SR4 compare to a new one?
A: Used units save 50–70% vs. new OEM prices but may have 2026-era firmware or wear. New units guarantee compliance with 2026 standards.

Q: Is a used 40G QSFP+ SR4 better than a refurbished one?
A: Refurbished units undergo factory testing and are more reliable than used ones, though both save 50–70% vs. new.

Q: Can I use a 40G QSFP+ SR4 with 2026 switches?
A: Yes, if firmware is 4.2.1 or later. Always verify compatibility with 2026-era models like Cisco N9918-40G.

Q: What’s the lifespan of a 40G QSFP+ SR4 in 2026?
A: 2026 industry benchmarks suggest 50,000–70,000 RF-hours. Units with >40,000 RF-hours are recommended for long-term use.