The ATOP 400G QSFP112 SR4 transceiver is a high-quality optical transceiver designed for utilization in 400 Gigabit Ethernet links over multimode fiber. This product features 4 independent electrical input/output channels capable of converting 106.25 Gbps (PAM4) electrical input data into 4 channels of 106.25 Gbps (PAM4) parallel optical signals. Additionally, it can also convert 4 channels of parallel optical signals, each operating at 106.25 Gbps (PAM4), into 4 channels of 106.25 Gbps (PAM4) electrical output data. The transceiver integrates 4 parallel channels operating at a center wavelength of 850nm, achieving a speed of 106.25 Gbps per channel. The maximum transmission distance is 100 meters on OM4 multimode fiber. The transceiver complies with the latest releases of the QSFP112 MSA. It is suitable for deployment in various network applications, including Internet protocol switches and routers.