How do I interconnect a switch 40G QSFP+port with a 10G SFP+port?

The QSFP+branch cable includes the QSFP+to 4 * SFP+DAC passive copper cable and the QSFP+to 4 * SFP+AOC active optical cable. Both types are connected with a QSFP+module at the A end and four SFP+modules at the B end. The transmission distance supported by the QSFP+to 4 * SFP+DAC passive copper cable is 7m, and the transmission distance supported by the QSFP+to 4 * SFP+AOC source optical cable is 70m.

In addition to the above two types of cables, there is also a QSFP+to four LC duplex AOC cables. One end is QSFP+, and the other end is four duplex LC optical fiber jumpers, which can be used when four SFP+optical modules are reserved, so as to realize the conversion from QSFP+to SFP+.

QSFP+to 4 * SFP+AOC active optical cable is built with a 4-channel 850nm VCSEL laser array and PIN photodetector array, which has a digital diagnosis function (DDM). It can not only predict faults, locate fault locations, shorten fault repair time and reduce losses through comprehensive analysis of the detected temperature, voltage, transmitted and received optical power, laser bias current warning and alarm states, etc, The lifetime of the laser can also be predicted by monitoring the bias current of the laser.

In the 10G upgrade 40G network scheme, you can use the 40G QSFP+to 4 * SFP+direct connection cable to directly connect the switch without purchasing additional optical modules, to help you save network costs and simplify the connection process. However, the transmission distance of this connection mode is limited, so DAC or AOC direct connection optical cable is more suitable for the connection of switches inside the cabinet or between two adjacent cabinets.