QSFP-H40G-AOC25M=

The QSFP-H40G-AOC25M is a 40 Gigabit active optical cable, 25 m long, with a QSFP+ connector on each end and multimode fibre carrying four lanes between them. It is intended for data-centre environments and has a standard commercial temperature range. Cisco's 40GBASE QSFP data sheet lists it among the QSFP-to-QSFP active optical cables, available from 1 m to 30 m. The rate is fixed by the cable type, so the port at each end must be set for the matching speed. It serves links across a data hall where the two devices sit far apart and the cable path is long. Keep a spare of the same length on the shelf if the link is critical, as there is no field repair for a moulded cable. The fibre jacket is lighter and thinner than 40G copper and avoids the reach limits copper has at this speed. The optics are sealed into the connector bodies, so there are no MPO connectors to clean and no transceivers to match. Check the host platform's supported-cable list before deploying, as support varies by switch family and software release.