3Com Baseline Switch 2024 - Switch - 24 ports - EN, Fast EN - 10Base-T, 100Base-TX - 1U (3C16471B-US) "crc error" Questions

...24 ports or with some ports ? Might be an indiacation towards the duplex mismatch. are you getting CRC errors on the interfaces

..."Half Duplex Mismatch" and "Excessive late collisions". The "receive" switch shows "Excessive CRC/alignment errors" The fiber has been throughly cleaned and tested. The media convertors as well ...