Arista QSFP-40G-PLR4-Arista | 40G QSFP+ Transceiver, Single-Mode, 10km, MPO

Q: What is the difference between PLR4 and SR4 transceivers?
A: The QSFP-40G-PLR4 uses single-mode fiber and reaches up to 10km at 1310nm wavelength, while SR4 uses multi-mode fiber with an 850nm wavelength and shorter reach (typically 100m on OM3). Both use parallel optics with 4 lanes, but PLR4 is designed for longer distances in campus and data center interconnects.

Q: Is this transceiver compatible with other vendors' equipment?
A: Yes, the QSFP-40G-PLR4 is MSA-compliant and optically interoperable with IEEE 40GBASE-LR4 standards, allowing connectivity with third-party switches and routers. However, it is programmed specifically for Arista platforms and may require vendor-specific coding for other equipment.

Q: Does this module support digital diagnostics monitoring?
A: Yes, the transceiver supports DOM/DDM functionality, providing real-time access to operating parameters including optical transmit and receive power, temperature, transmit bias current, and supply voltage for proactive network monitoring and troubleshooting.

Q: What fiber cable type and connector are required?
A: This transceiver requires single-mode fiber (SMF) with an MPO/MTP-12 connector. While the connector has 12 fibers, only 8 are actively used for the 4 transmit and 4 receive lanes, following standard 40G parallel optics pinout configurations.

Q: Can this transceiver be used for 4x10G breakout connections?
A: The PLR4 architecture uses parallel 10G lanes internally, but it is designed as a native 40G interface. Unlike SR4 modules that can support 4x10G breakout with appropriate cabling, the PLR4 is optimized for 40G single-mode applications and typically operates as a 40G port.