ATOP’s APS8T55B5xDL15A transceiver, also known as 25G DWDM Tunable SFP28 15km Transceiver, is SFP28 tunable module for duplex optical data communications, supporting up to 25.78Gb/s. The 25G tunable DWDM products, with 100GHz channel spacing, support 48 channels (191.3~196.0THz) wavelength adjustment. It is also with the SFP28 20-pin connector to allow hot plug capability. Digital diagnostic functions are available via an I2C. It has built-in clock and data recovery (CDR). This module is designed for single-mode fiber.