Thanks for your questions. The datasheet for the Cisco Nexus 31108TC-V has a clear indication that its QSFP28 port supports 4 x 10G, considering that you need to connect to the switch which supports only SFP+ (10G) multimode SR type, so 1) yes, you can use the connection that 40G SR4 transceiver #48659 with MPO Female to LC UPC Duplex Cable #66262 2) we recommend that you to use 40G QSFP+ to 4 Duplex LC AOC #48659 to connect the LC port to the SR module in the custom switch. If you have any questions, please feel free to contact sales@fs.com. By FS on 10/04/2019

Thanks for your inquiry, we recommend you to choose 8 fibers MPO-LC type B single mode harness cable #66263 or 8 fibers MPO-LC type B Multimode harness cable #66262 for your application. By FS on 28/03/2019

Hello, yes, the three products you purchased can compatible together. You can connect them according to the following steps: QSFP-4X10G-LR-S---->MTP trunk cable #43985---->96 fibers Patch Panel Flat #43552---->singlemode duplex LC/LC fiber patch cable---->10G-LR SMF SFP+. Thanks By FS on 31/05/2018

Sorry, 40G QSFP+ transeivers that operate at an industrial temperature range are currently not available, but in development. Please stay tuned. By FS on 17/03/2018

The FS.COM 40GBASE-PLR4 QSFP+ transceivers use 12 fibers single mode MTP Type B trunk cables for direct connection such as #68018 and as for 10G to 40G network speed upgrade connection, 8 fibers single mode MTP-LC Type B harness cable #68048 can be applied. By FS on 04/10/2017

As for customized transceivers, FS.COM offers regular custom choices such as compatibility, transmission distance, operating temperature, label pattern, label colors and etc. What's more, FS.COM welcomes any inquiry for customized products and solutions for all need and specifications. By FS on 15/07/2017

Yes, the 40G QSFP+ PLR4 Transceivers can work with #10G LR transceivers directly due to their MTP/MPO connectors. And #MTP-LC Harness Cables are highly recommended as matching fiber cables. By FS on 11/06/2017

Besides the price advantage we have compared to branded transceivers, FS.COM compatible transceivers also maintain the same performance and reliability. To satisfy our customers' needs of high performance, all of our transceivers are tested multiple times in mainstream original brand switches in our test center before shipped out. By FS on 07/06/2017

On one hand, the FS.COM 40G QSFP+ transceivers with LC interface are used for long-distance transmission over single mode fiber, and those with MTP/MPO interface are utilized for short distance transmission over multimode fiber. On the other hand, for the FS.COM 40G QSFP+ transceivers with LC interface, they cannot be split into 4x10G as they use 4 wavelengths on a pair of single-mode fibers and do not lend themselves to “splitting” into 4 pairs without substantial complexity to split out the wavelengths. For the FS,COM 40G QSFP+ transceivers with MTP/MPO interface, they can be used in 4x10G connectivity via an external 12-fiber parallel to 2-fiber duplex breakout cable, which connects the 40G transceiver to four 10G optical interfaces. By FS on 05/06/2017

FS.COM has been maintaining huge stock level of the 40GBASE-PLR4 QSFP+ transceivers in U.S. warehouse, EU warehouse and CN warehouse. As long as the products you order are all in stock, we will ship them out the same day you place your order. As for some specific products or products that have a short stock, we will keep you informed ahead of time before you place your order. By FS on 06/05/2017