public boolean removePort(String port_name){
		Port sgl;
		boolean item_found = false;
		for(int i=0;i<ports.size();i++){
			sgl = (Port) ports.get(i);
			if (sgl.name.equals(port_name)){
				item_found = ports.remove(i) != null;
				break;
			}
		}
		return item_found;
	}