QSFP-40G-ER4 Arista Compatible 40G QSFP+ ER4 40km SMF

The QSFP-40G-ER4 is a 40G optical transceiver compatible with Arista platforms.

• Data Rate: 40G
• Protocol: ER4
• Wavelength: 1550nm
• Fiber Type: SMF
• Reach: 40km
• Connector: Duplex LC
• OEM Equivalent: QSFP-40G-ER4

Compatibility: The QSFP-40G-ER4-ARI-TFO is TenFour Optics' compatible equivalent of the Arista QSFP-40G-ER4, coded per order for Arista platforms. Arista lists the QSFP-40G-ER4 for use in 40G QSFP+ ports on: 7050X3 Series, 7060X Series, 7280R3 Series, and 7300X3 Series. Add your switch model and OS release in the order notes, or email 10.4@tenfouroptics.com, and we confirm coding before it ships.

Tested & Proven: Every TenFour Optics part is coded, tested, and verified before shipment — see Tested & Proven.

OEM-compatible and MSA-compliant. Compliance documentation (RoHS declaration, IEC 60825-1 laser classification) is available on request for project quotes. Digital Diagnostic Monitoring (DDM/DOM) supported. Every module is tested for traffic conformity per supported layer 2/3 protocols, DOM threshold verification, EEPROM/MSA value verification, serial number verification, and optical cleanliness before shipment.

Backed by the GreenLights4Life® Limited Lifetime Replacement Warranty. In-stock items ship same or next business day — contact 10.4@tenfouroptics.com to confirm availability and lead time.