How can I log the data transmission of my switch in a file to analyze the quality of my communication channel?

How can I log the data transmission of my switch in a file to analyze the quality of my communication channels?

A lot depends on what type of switch you have and what kind of communication channels you're asking about.
There are several Cisco tools (e.g., "ip sla", SNMP-queried values, show commands etc.) that can give useful information.
If you give us some more information we can help more specifically.

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