The Cisco QSFP 4SFP10G CU1M supports link lengths

 QSFP 4SFP10G CU1M are suitable for very short distances and offer a highly cost-effective way to connect within racks and across adjacent racks. SFP+ cables offers a low cost SFP+ solution. SFP+ directly attached twinax cable assemblies supports 10 Gigabit Ethernet, 10 Fibre Channel, and other industry standards.The  QSFP 4SFP10G CU1M module is a hot-swappable, parallel fiber-optical module with four independent optical transmit and receive channels. These channels can terminate in another 40-Gigabit QSFP+ transceiver, or the channels can be broken out to four separate 10-Gigabit SFP+ transceivers. (See Figure 1.) The QSFP+ transceiver module connects the electrical circuitry of the system with either a copper or an optical external network. (See Figure 2 for a view of the optical QSFP+ transceiver.) The transceiver is used primarily in short reach applications in switches, routers, and data center equipment where it provides higher density than SFP+ modules.