Description The Mikrotik Q+31DLC40D compatible 40GBASE-ER4 module provides high-density 40G connectivity over a 40km reach via single-mode fiber (SMF). Featuring a 1310nm wavelength and a duplex LC connector, it includes full DOM support for precise real-time diagnostics. This module is an ideal solution for long-reach interconnections in Mikrotik-equipped professional networking.