The difference between 100GBASE-LR4 QSFP28 1310nm 10km and 100GBASE-LR QSFP28 Single Lambda 1310nm 10km is in hardware. The modulation mode of 100GBASE-LR QSFP28 Single Lambda is PAM4, while the modulation mode of 100GBASE-LR4 QSFP28 is non-return-to-zero code (NRZ) modulation. Products using NRZ modulation are mainly used in 4G Ethernet. The PAM4 pattern is 4 times faster than NRZ modulation in transmission. Par L***e le 30/01/2020

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. Par M***l le 08/07/2017

Hello, the one on the site doesn't support, but we can offer customized QSFP28 LR4 modules with OTU4. For more information, welcome to contact with us freely. Par Q***g le 08/06/2018

Sorry, 100G QSFP28 transeivers that operate at an industrial temperature range are currently not available, but in development. Please stay tuned. Par T***z le 17/02/2018

No, they don't, but the #100/112G Dual Rate 1310nm 10km Transceivers support OTU4. Par C***r le 17/01/2018

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. Par S***s le 08/08/2017

Dust and contamination can accumulate on transceiver's connectors and cause problems such as reducing the optic launch power. To ensure better connection, FS.COM strongly recommends cleaning both connectors each time you disconnect and reconnect them. FS.COM High Quality One-Push Fiber Optic Pen Cleaner for 1.25mm LC/MU Connector is the best cleaning choice for 100GBASE-LR4 QSFP28 transceivers. Par D***l le 06/06/2017

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. Par M***n le 05/06/2017

FS.COM has been maintaining huge stock level of the 100GBASE-LR4 QSFP28 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. Par J***e le 03/06/2017

The maximum power consumption of 100GBASE-LR4 QSFP28 transceivers is 3.5W. If it draws greater than 3.5W, FS.COM can not guarantee the performance since there are other dependencies like airflow direction, ambient temperature, elevation and etc. Par K***l le 23/05/2017