Property Management System (PMS) is a stand-alone computer system that environments such as hotels or hospitals use for services such as reservations, registration, messaging, housekeeping, night audit, billing, and inventory. The PMS Link provides a communications channel between the switch and the customer-owned PMS so that the PMS can interrogate the system for information related to the following features:

• Message Waiting Notification
• Controlled Restriction
• Housekeeping Status
• Check-in/Check-out
• Room Change/Room Swap

The PMS device connects to the system via a data module (PDM, MPDM, DTDM) connected to a port on a PROCR.

PMS Link maintenance provides a strategy for maintaining the link between the switch and a PMS device. The strategy includes a set of tests for periodic diagnosis, detection of errors during normal operation, actions for troubleshooting, and raising alarms for serious problems. PMS Link Maintenance uses a try-and-wait mechanism for maintaining the PMS Link. If a PMS Link is torn down due to an error, PMS Link Maintenance attempts to bring up the link immediately. If the Link Setup fails, PMS Link Maintenance will wait for five minutes before the next retry. If the number of retries reaches a threshold (12), a Minor alarm is raised for service attention.

PMS Link Maintenance does not cover the maintenance of the elements composing the PMS physical link (the external PMS device, Data Module (PDM/MPDM/DTDM), or ADU). If PMS Link Maintenance cannot restore the PMS Link, then the maintenance tests of these individual components of the PMS Link must be executed to diagnose faults. If test pms-link fails, no alarm will be generated.

The list pms-down command lists every meaningful event to the PMS that occurred while the link between the switch and the PMS was down. For example, any room status codes entered by hotel housekeeping staff during a time of PMS outage would be shown in this report.