I noticed that the red cable has standarized RJ-45 connectors, similar as regular computer network cable, can I replace the cable with a standard ( longer ) LAN cable?

It is correct that the red cable is of regular network cable type with standard RJ-45 connectors, though standard cables are not reinforced around the connectors to make it rugged.

Purposely chosen, this cable type allows for easy replacement worldwide in case of cable failure / breakage. Please consider using another cable type without reinforced connectors as a temporary fix. Please order a original new cable from TQC for replacement purposes.