5.1.8 Network Time Protocol (NTP) ....................................................................................... 545.2 Port Security .................................................................................................................. 556 Troubleshooting ................................................................................... 576.1 Troubleshooting ............................................................................................................ 586.1.1 Installation .................................................................................................................... 586.1.2 Operation ...................................................................................................................... 586.1.3 Restarting the Control Box ........................................................................................... 596.1.4 Troubleshooting by Error Log ....................................................................................... 607 Appendix ............................................................................................... 637.1 System Prompt Languages .......................................................................................... 64Table of Contents6 Installation Manual