QSFP-H40G-ACU7M=

The QSFP-H40G-ACU7M is an active copper cable for 40 Gigabit Ethernet, 7 m long, with a QSFP+ connector fixed to each end. Both ends are permanently attached, so nothing needs cleaning, and the whole cable is replaced if either end is damaged. Because it is built to a set length, stock planning is by length, so a rack plan listing each link helps ordering. That extends copper beyond the 5 m limit of the passive range, carrying four 10G lanes each way between QSFP+ ports. Plan the route before ordering, because a fixed-length cable cannot be shortened or extended later. Cisco's 40GBASE QSFP data sheet lists it with the active copper cables, which add signal conditioning in the connectors. Laying the cable in before the equipment is fully racked leaves the final connection for last and saves rework. It is an option when a mostly in-row 40G link has to span several cabinets and you would rather avoid optical modules. It suits end-of-row and adjacent-rack layouts where the route is longer than the straight-line distance between the two ports.