Rather than trying "no clock rate" and making it null/0 have you tried "clock rate " instead. I don't think that "no" would be supported because you'd be trying to remove timing all together rather than change it. I would think it's supported, just ensure it's the DCE interface..
If the interface is a DCE then you'll not be able to remove this. This could be as simple as changing to a DTE cable that connects your interface. I believe a "show controllers serial " will show you if this interface is a DCE. A DTE interface will pull it's timing from the line (RX side data) so this interface type is needed if you plan to have no clock rate.
If there is a DCE configuration on the interface then yes. Sometimes the cable type that is connected to the interface will determine if this is DCE or DTE. (check the cable a lot of times it says it right on there).
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