Media diagnostics · Primary-source explanation; examples are illustrative. Instructions are based on publisher guidance; a UK IPTV account was not tested on this platform.
Identify the relevant adapter
The ethtool manual documents a query using just the network device name to print its current settings. An adapter product description can list gigabit capability while the actual link uses another speed. Before buying replacement streaming hardware, identify the interface the computer is using and read its current settings. Keep the supported modes, current speed, duplex and reported link state under their own labels rather than treating them as one performance result.
Use a controlled cable comparison
An original test plan records the current link, replaces only a suspect cable with a suitable known working one, then records the link again after reconnection. If the reported link changes, that is useful evidence about this local segment. It does not establish the cause from a single number, nor prove that a remote video will sustain an equivalent application data rate. Retain which switch or router port was involved so the comparison is reproducible.
Do not force a setting as the first step
The same utility has commands which change negotiation and hardware settings. Those are not required for the initial query and should not be copied blindly into a viewing support workflow. A lower than expected current link is a reason to inspect the physical segment and documented equipment capabilities. A correctly negotiated link is only one layer of the complete route; the source, internet connection and player can impose separate limits.