With the arrival of 40G Ethernet, many enterprise users are starting to fully utilize current 10G network devices to upgrade to 40G networks. Specifically, it is the problem of how to use 40G switches with QSFP+ ports in conjunction with existing 10G devices (switches and servers) with SFP+ ports.
Cabling solution: Use QSFP+ breakout cable
QSFP+ breakout cables include QSFP+ to 4 * SFP+ DAC passive cable and QSFP+ to 4 * SFP+ AOC cable. Both types are connected to one QSFP+ module at the A end and four SFP+ modules at the B end. The transmission distance supported by QSFP+ to 4 * SFP+ DAC passive cable is 7m, and the transmission distance supported by QSFP+ to 4 * SFP+ AOC cables is 70m. In addition to the above two types of cables, there is also a QSFP+ to 4 LC duplex AOC cable, with one end being QSFP+ and the other end being 4 duplex LC fiber optic jumpers, which can be used when there are reserved 4 SFP+optical modules to achieve QSFP+ to SFP+ conversion.
QSFP+ to 4 * SFP+ DAC passive copper cable has the advantages of anti radiation interference and low power consumption, making them the best solution for low-cost data transmission within 7m.
QSFP+ to 4 * SFP+ AOC active optical cable is equipped with a 4-channel 850nm VCSEL laser array and PIN photodetector array, and has digital diagnostic function (DDM). It can not only comprehensively analyze the detected temperature, voltage, emission and reception optical power, as well as the warning and alarm status of laser bias current, but also predict faults, locate fault locations, shorten fault repair time, and reduce losses, It is also possible to predict the lifespan of the laser by monitoring its bias current.
In the 10G upgrade 40G network solution, you can use 40G QSFP+ to 4 * SFP+direct cable to directly connect to 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 method is limited, so DAC or AOC direct fiber optic cables are more suitable for connecting switches inside the cabinet or between two adjacent cabinets.
Jumper solution: Use MPO to convert 4 duplex LC breakout jumpers
The MPO to LC branch jumper is a fiber optic jumper that uses an OM3 or OM4 multimode fiber to connect an 8/12 core MPO connector on the A end and four duplex LC connectors on the B end. When using the MPO to LC branch jumper scheme, it is necessary to reserve one 40G QSFP+SR4 optical module and four 10G SFP+SR optical modules at both ends of the switch. When using, simply insert the MPO connector into the 40G QSFP+SR4 optical module interface, and then insert the 4 duplex LC connectors into the 4 10G SFP+SR optical module interfaces.
Module adapter solution: CVR-QSFP-SFP10G module adapter
This solution is to convert the 40G ports on the switch to 10G ports through the 40G QSFP+to 10G SFP+converter module CVR-QSFP-SFP10G, thereby achieving interconnection between the QSFP+ports and the 10G SFP+ports. The operation method is to plug the 40G converter CVR-QSFP-SFP10G into the QSFP+port, and then insert the 10G SFP+optical module to replace the 40G port with the 10G port.
