The QSFP28 package has become a mainstream 100G optical module with smaller size, power consumption and price advantages. In practical applications, how should we solve the interconnection requirements of 100G ports and 40G, 25G, and 10G ports? Below, ETU-LINK will introduce several common solutions to you.

QSFP28 port interconnects with QSFP+ port

We need to change the switch port configuration to 40G operation, and then we can use Yitianguang Communication 40G QSFP+ to QSFP+ DAC direct attach cable, 40G QSFP+ to QSFP+ AOC active optical cable or 40G QSFP+ SR4 optical module with 12-core MPO fiber patch cord realize the interconnection between 100G equipment and 40G equipment.

QSFP28 port interconnects with SFP28 port

We can use 100G QSFP28 to 4*25G SFP28 DAC high-speed cable, 100G QSFP28 to 4*25G SFP28 AOC active optical cable, or use 8 / 12 core mpo-4 * duplex LC branch jumper to connect 100G QSFP28 SR4 optical module with four 25G SFP28 SRS, so as to realize the interconnection between 100G equipment and 25G equipment.

QSFP28 port interconnects with SFP+ port 

If you want to interconnect the QSFP28 port with the SFP+ port, you need to reduce the speed of the QSFP28 port of the switch to 40G first, and then use Yitianguang Communication 40G QSFP+ to 4*10G SFP+ DAC high-speed cable, 40G QSFP+ to 4*10G SFP+ AOC Yes Source optical cable or use 8/12 core MPO to 4 duplex LC branch jumpers to connect 40G QSFP+ SR4 optical module and 4 10G SFP+ optical modules to realize the interconnection of QSFP28 port and SFP+ port.

The above is the solution of QSFP28 port interconnection with QSFP+, SFP28, SFP+ port introduced by ETU-LINK. In addition to the 100G rate, the QSFP28 port of the switch can also be used at 40G, 4*25G, 4*10G run. Therefore, 100G switches can be used with 40G, 25G, and 10G rate communication equipment.