def deletePhysicalInterface(self, physicalInterfaceId):
        """
        Delete a physical interface.
        Parameters: physicalInterfaceId (string).
        Throws APIException on failure.
        """
        req = ApiClient.onePhysicalInterfaceUrl % (self.host, "/draft", physicalInterfaceId)
        resp = requests.delete(req, auth=self.credentials, verify=self.verify)
        if resp.status_code == 204:
            self.logger.debug("physical interface deleted")
        else:
            raise ibmiotf.APIException(resp.status_code, "HTTP error deleting a physical interface", resp)
        return resp