Arista QSFP-40G-XSR4-Arista | 40G QSFP+ Transceiver, Multi-Mode, 300m OM3, 850nm

Q: What fiber types are compatible with the QSFP-40G-XSR4?
A: This transceiver is designed for laser-optimized multimode fiber (MMF). It supports OM3 fiber for distances up to 300m and OM4 fiber for distances up to 400m using an MPO-12/MTP connector with 8 active fibers (4 transmit, 4 receive).

Q: Can this module operate in 4x10G breakout mode?
A: Yes, the QSFP-40G-XSR4 can be used in 4x10G mode when combined with an MTP-to-LC breakout cable, allowing connection to four separate 10GBASE-SR optical interfaces. Both hardware and software support is required on the host switch.

Q: Is this transceiver compatible with third-party equipment?
A: While coded for Arista Networks platforms, MSA-compliant QSFP-40G-XSR4 transceivers from compatible manufacturers can work with other vendors' equipment that supports 40GBASE-SR4/XSR4 standard and accepts appropriately coded modules.

Q: What is the difference between SR4 and XSR4 transceivers?
A: The XSR4 is an extended-reach variant of SR4. While 40GBASE-SR4 supports up to 100m on OM3 and 150m on OM4, the 40GBASE-XSR4 extends this to 300m on OM3 and 400m on OM4, providing greater flexibility for larger data center deployments.

Q: Does this module support Digital Optical Monitoring?
A: Yes, the QSFP-40G-XSR4 includes DDM/DOM functionality accessible via the I2C interface. This allows real-time monitoring of optical output power, receive power, temperature, transmit bias current, and supply voltage for proactive network management.