An APC Smart-UPS (SUA, SUM and SURTA part numbers only) in combination with the APC AP9840 shutdown serial cable
Cisco IOS Software Release 12.3(4)T or later and the IP voice image or higher are required in order to work with the APC Smart-UPS. To enable Cisco IOS Software to monitor the signal form the APC UPS, the following Cisco IOS Software configuration needs to be added to the router:
• line aux 0
• privilege level 15
• modem Dialin
• autocommand service-module service-engine <slot>/0 shutdown
• where is the Cisco Unity Express slot number
This integration is compatible with APC’s Smart-UPS™ with prefix SUA, SUM & SURTA only, using the AP9840 serial cable. The cable requires connectivity to the AUX port of the Cisco Unity Express module. The Smart-UPS will only initiate the shutdown command after its battery capacity has reached less than 5 percent.
After the loss of AC power, the APC UPS requires the shutdown signal to be asserted for at least 4 seconds before the APC UPS shuts down. Thus, a narrow window exists after Cisco Unity Express has been signaled to shut down during which the AC power may be immediately restored. If this happens, the APC UPS will not shut down the router at all. In this case, the Cisco Unity Express application is shut down, but the router is not and requires that the user manually bring the Cisco Unity Express back online.