CISCO QSFP-40G-SR4= 40GBASE-SR4 QSFP Transceiver Module with MPO12 Connector
QSFP Port cabling specifications. Cisco QSFP. The 4x10G connectivity is achieved using an external 12-fiber parallel to 2-fiber duplex breakout cable, which connects the 40GBASE-SR4 module to four 10GBASE-SR optical interfaces.