With the DOM feature, it is easy for us to troubleshoot the failure of the link, which offers us a lot of convenience. Nice feature.

The account managers from FS always help and answer my questions in a timely manner. A lot of thanks for recommending this module to help us to achieve 100Gbps transmission.

We ordered two for our 28km transmission, and hoped to receive them as soon as possible. The sales kindly arranged the shipping quickly and informed us of the logistics. The products arrived faster than we expected and ran well on our Cisco switches.

In a previous purchase, we bought DWDM MUX #75887 at FS. This time, we ordered the 100G-ER4 module to connect 1310nm port on the DWDM MUX. Before ordering, the sales confirmed our transmission distance and optical loss first, and suggested us to use fiber attenuators to ensure the module could work.

These 100G ER4 Optics worked well over dark fiber 34 km to connect two S5850-48S2Q4C switches. Trustworthy! FS

We want to splitter the 100G for 32 receivers 100m away from the signal source. A 1x32 PLC splitter is installed. Taking into consideration of the optical loss of the whole link, we need some optical transceiver modules with at least 20dB optical budget. The maximum power budget of 100G ER4 1310nm 40km Transceivers the sales recommended is 18db. But we still want to search for the one with at least 20dB and, consequently, come to an impasse. The good news, when we confide our worries, is that the tech person blaze a trail to suggest replacing the 1x32 PLC splitter with 1x4 and 1x8 splitters between which the SOA is placed. If the transceiver cannot deal with the link loss then add the SOA to amplify the optical signal. This is excellent. All work perfectly. I give it 5 stars for FS efficiency and professionalism. Save us from the dead end.

Our plan is to build a 100G metro network. We’ve got a single pair dark fiber ring made of 3x 9KM and 1x 17KM fiber segments, and run 10G links on passive DWDM channels 28 to 35. We were considering the max. loss of the whole link, which should be within 17db. We asked FS sales and tech staff several times for advice. During the whole communication, we’ve always got a quick response and professional support, saving us a lot of effort. At last we decided to do what the team had suggested: go with the QSFP28 ER4 with a maximum loss of 18db that completely suits our needs. The packages arrived fast and well-packed. All modules worked great for the past nine months with no issue at all. The sales rep kept concerning our using experiences from time to time. We really appreciate that. We’ve got nice overall experience with the company and are looking forward to more cooperation. So many THANKS for what you’ve done for us.

We have ordered some 10dB Gain 1310nm SOA pluggable modules here not long ago. Since we are just at the starting point of using 100GE, we are also looking for some 100G optics. But it’s not sure whether to choose QSFP28 CWDM4 or QSFP28 ER4 modules since 100G is completely new ideas to us. The tech team recommended QSFP28 ER4 modules to be used with SOA and amplified on 1290nm to 1330nm band. So I placed an order for those optics. The package arrived in a timely manner. Now this ER4 transceivers work great with the SOA and perform excellent compatibility on our 100G switches. We are thrilled by the professionalism and great enthusiasm of FS tech stuff and sales rep. Thank you so much.

I need some modules to connect with my Mellanox SN2700 and Penguin Artica 3200c switches. Well, my sales rep. told me my switches are somewhat special, so I was advised to choose customized 100GBASE-ER4 QSFP28 modules. The tech staff also reminded me of checking which ports on my switches support ER4/LR4 transceivers. I appreciate their professionalism. Now I find the modules work very well with my switches maintaining the same performance and reliability as the original modules, and the whole network also performs stably. By the way, they made a fast delivery and solved our crying needs, as they have goods in stock. Thanks a lot.

I have hesitated to order it because of price(7k), so when I got to know the latest price in the early of Sep, I order one piece to test, all is fine. We do use a lot of 100Gbps transceivers these days, FS.COM is our first choice.