From Darko review of the Telegartner M12 switch:
The manufacturer won’t disclose any details apart from this [presumably machine translated from Japanese]:
‘Our M12 Switch Gold is not bound with those specifications of data transfer and electrical characteristics as a switching hub. Therefore, it is difficult to evaluate by a simple comparison with those for commercially available ones.
PCs, various network boards, switching hubs and routers are network equipment that transmits and receives various data, but become a signal source of transmitting and receiving unnecessary radio wave and noise (= subtle current) simultaneously. A very high level of consideration is required to sweep these negative aspects. The M12 Switch Gold uses aborbers and suppressors for that reason.
The negativeness in various aspects such as EMI/EMC, electro-static field, induction, noise caused by subtle vibration of the chassis is taken into consideration, and the model design including various mechanical features and its assembly procedure is determined.
To realise these, absorbers and suppression parts are adopted in the model, and torque management takes place in various spots during the assembly. The round M12 X-coded connectors added a positive effect.
These are aimed for getting rid of a negative influence from the M12 Switch Gold to other pieces of connected network equipment such as supurious emission and transmission noise generated by the M12 Switch Gold, as well as for protecting the switch itself if an external inductive or electro-static influence comes in.
Our thought that the M12 Switch Gold could be used for network audio came from the above-mentioned features.’”