Hi Planck,
Please access the following link to find the documentation for CE6857-48S6CQ-EI.
https://support.huawei.com/hedex/hdx.do?docid=EDOC1100054000&id=EN-US_CONCEPT_0138782032&lang=en
By accessing the “Appearance and Structure” category you can find at point 12 the “Applicable modules and cables” where you can find the 1GE copper modules:

I hope it helps!