Bought these 100G ER4L modules for our 100Gbps connection between two sites with the distances of about 20-25 km. Compatible with my switches and operated well in a long term, these superior transceivers that suitable for long-haul transmissions have provided optimal 100GbE solutions for us.

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.