Although 40G QSFP+ and 100G QSFP28 are widely used, most data center networks have not replaced all 10G equipment with 40G or 100G equipment. On the contrary, in most cases, 10G, 40G and 100G will coexist in the same network. So how to deploy 10G/40G and 100G in the same network?

40G QSFP+ to 10G+

As following figure, the upgraded 40G switch needs to use 1×24 core to 3×8 core MTP trunk cables to connect with the existing 10G server. On the switch, the 24-core fiber panel can be connected to 24-core fiber patch cables, and supports three 40G ports. In the server rack, each 40G port can realize 10G LC connection to facilitate the deployment of servers.

Note: In this structure, if you have an existing 12-core MTP trunk cable, you can use two 12-core MTP Fiber Cassettes to connect 3×8 core MTP trunk cable instead of redeploying 24-core MTP trunk cable. However, if your network application is more complex, it is recommended to directly use the 24-core MTP trunk cable to make it easier to successfully implement the network upgrade.

CFP2 100G Port (10×10)

The following figure also shows the similar situation of the existing 10G server, but it uses 100Gbase-SR10 port on the switch. At this time, a 24-core fiber connector is required to connect to the 10×10 optical module port. It should be noted that the 8-core fiber patch cable is not used here to connect, but a 24-core MTP trunk cable is used to connect the switch to the fiber cassette on the top of the rack. The 24-core MTP trunk cable can connect the switch and the server rack, and the MTP fiber cassette on the top of the server rack can convert 100G port into 10x10G ports with LC connectors.

Note: In this case, if you already have two 12-core MTP trunk cables, you can use the MTP adapter panel with 12 ports, and then use 2×12 cores to 1×24 cores MTP trunk cables to create same channel on the switch.

Redeploy 40G/100G Network

Below figure is an example of redeploying 40G and 100G networks. Without any 10G switches in Fibre Channel, 40G/100G can be used directly. This method is suitable for 40G or 100G ports of core switches and 40G uplinks of ToR switches. In addition, the MTP adapter panel can be used on the top of each rack, and all 8-core fiber patch cables can realize the connection between the QSFP+ port and the QSFP+ port.

Note: In this structure, we can use 24-core fiber patch cable to connect to 40G ports, or each branch can be equipped with 8-core fiber patch cable, so that each 40G or 100G port has 8-core cable. In addition, this method effectively avoids the use of 12-core MTP trunk cable.


Generally speaking, network upgrades require the removal of the previous cabling structure and re-cabling, but deploying 10G, 40G and 100G in the same network can effectively avoid expensive network upgrade costs.