QSFP-H40G-CU4M=

The QSFP-H40G-CU4M is a passive copper cable for 40 Gigabit Ethernet, 4 m long, with a QSFP+ connector on each end. It connects two QSFP+ ports directly, contains no active electronics and gives no digital diagnostics. Cisco's 40GBASE QSFP data sheet groups it with the 40GBASE-CR4 copper cables, which carry four 10G lanes in each direction. Check the host platform's supported-cable list before deploying, as support varies by switch family and software release. The cable is a single sealed assembly, supplied as the spare part number with the equals suffix. The cable is wider and stiffer than a 10G twinax, so allow a gentle bend radius when dressing it. Seat each plug until it latches, then give the cable a gentle tug to confirm the pull-tab latch has engaged. It spans a full rack and typically the adjacent rack as well, with room for a tidy loop in the vertical cable manager. Because it is built to a set length, stock planning is by length, so a rack plan listing each link helps ordering.