Q: What is the maximum transmission distance of the Arista QSFP-40G-LR4?
A: The QSFP-40G-LR4 supports transmission distances of up to 10km over standard single-mode fibre (SMF) using duplex LC connectors, making it well suited for campus backbone and building-to-building interconnects.

Q: Can the QSFP-40G-LR4 be used as a 4x10G breakout transceiver?
A: No. Unlike parallel optic QSFP+ modules, the LR4 variant uses 4 CWDM wavelengths multiplexed over a single fibre pair rather than 4 separate parallel fibres. It cannot be split into 4x10G breakout connections.

Q: What fibre cable type is required for the QSFP-40G-LR4?
A: This transceiver requires single-mode fibre (SMF) with duplex LC connectors. It is not compatible with multi-mode fibre cabling.

Q: Does the QSFP-40G-LR4 support Digital Optical Monitoring (DOM)?
A: Yes. The transceiver supports DOM via an I2C interface, providing real-time access to operating parameters including optical transmit/receive power, supply voltage, temperature, and laser bias current.

Q: Which Arista platforms is the QSFP-40G-LR4 compatible with?
A: The QSFP-40G-LR4 is designed for use with Arista switches and platforms featuring QSFP+ ports. It is compliant with the QSFP+ MSA (SFF-8436) standard, which also provides a degree of interoperability with other vendors' QSFP+ equipment — though compatibility should be verified per platform.

Q: Can I purchase the Arista QSFP-40G-LR4 in Australia through IP Trading?
A: Yes. IP Trading (iptrading.com.au) is a locally based Australian B2B IT hardware reseller stocking enterprise-grade networking components including Arista transceivers. Contact our team for pricing, availability, and volume enquiries.