4.5 Fault Recovery/Diagnostics4.5.1 Power Failure RestartDescriptionWhen turning the electricity back on, the Control Box restarts the stored data automatically and will recordthe event (System Restart) in the error log.Conditions• In the event of a power failure, the Control Box's memory is protected by a factory-provided lithiumbattery.4.5.2 Dynamic Host Configuration Protocol (DHCP) AssignmentDescriptionIt is possible to assign the Control Box as a Dynamic Host Configuration Protocol (DHCP) client, allowing IPaddresses to be received from a DHCP server over a LAN.Conditions• It is possible to enable this feature through system programming.NoticeIt is important to set your DHCP server to not change the IP addresses of the mother board and DSPcard after IP devices have been registered to the Control Box. Those devices will not operate properly ifthese IP addresses are changed.PC Programming Manual References16.1 Network Service—[1] IP Address/Ports—Basic Settings→ LAN Setting—Obtain an IP address automatically/Use the following IP address→ LAN Setting—IP Address→ DSP IP Setting—Obtain DSP IP address automatically/Use the following DSP IP address4.5.3 PING ConfirmationDescriptionIt is possible to confirm the connection of IP telephones, routers, and hubs within or outside the privatenetwork using PING. The Control Box will send an Internet Control Message Protocol (ICMP) echo requestthrough the PC programming terminal and receive an ICMP message confirming connection.Conditions• The Control Box performs PING as follows:– Test packet length: 56 bytes– Ping attempts: 5– Time out length: 1 second– Ping interval time: 1 second4.5 Fault Recovery/DiagnosticsFeature Manual 43