Is the shielding layer of a data center switch cable grounded at one or both ends?

The grounding method for the shielding layer of data center switch cables depends on the interference frequency: For low-frequency audio bands (<100kHz), single-end grounding avoids power frequency interference from ground loops; for high-frequency EMC bands (>1MHz), double-end grounding is necessary to provide a low-impedance return path. For switches operating at frequencies >100MHz, the network cable shielding layer should be grounded 360° to the chassis at both the switch and device ends. Actual measurements show that double-end grounding provides 15-25dB higher shielding effectiveness than single-end grounding in the 30MHz-1GHz frequency band. Note: When using double-end grounding, ensure the potential difference between the chassis grounds at both ends is <1V; otherwise, add a grounding equipotential bonding wire or use a shielded choke instead.