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-301 LC 1.25mm Cleaner is the best fiber cleaner for 40GBASE-LR4L QSFP. By FS.COM on 05/21/2017

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.COM on 05/15/2017

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.COM on 05/14/2017

The Fiberstore 40GBASE-LR4L primarily enables high-bandwidth 40G optical links over duplex single mode fiber patch cable with LC/UPC connectors. By FS.COM on 05/12/2017

The Fibertore 40GBASE-LR4L QSFP module supports link lengths of up to 2km over a single mode fiber. It is interoperable with 40GBase-LR4 for distances up to 2km. By FS.COM on 05/03/2017