Yes, the 40G QSFP+ PIR4 Transceivers can work with #10G LR transceivers and #MTP-LC Harness Cables for 4x10G connectivity. By FS on 04/17/2018

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

The FS.COM 40GBASE-PLRL4 QSFP+ transceivers use 12 fibers single mode MTP Type B trunk cables for direct connection such as product #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 10/16/2017

It is highly recommended that a data center facility implement cleaning procedures for all fiber optic connectors to reduce link failures and unnecessary replacement of expensive and critical network equipment. Fiberstore FOPC-903 MTP/MPO Cleaner is the best fiber cleaner for 40GBASE-PLRL4 QSFP. By FS on 06/03/2017

No. Network equipment manufacturers do not require that you use only name-brand optics. In fact, when a product fault or defect occurs in the network, and the fault or defect is not attributable to the use of third-party optics, they will continue to provide support for the affected product under warranty or covered by their support program. By FS on 05/22/2017

We supply a huge volume of optics to a variety of customers, so in most cases we have all of the most popular optics in stock, ready to ship. However, some of the higher-value and specialized optics have a short lead time. You can find the stock information and the estimate delivery date from the product page easily, or contact sales@fs.com directly before you place the order. By FS on 06/21/2017

The Fibertore 40GBASE-PLRL4 QSFP Modules support distances compatible with 10GBASE-LR, which is 1km on single mode fiber. By FS on 05/15/2017