Siemens CP 1515 User Manual page 277

compensate for the propagation delays that occur in passing the
protocol information, allowing all bridges to close the old data paths,
before the new data paths are activated.
Recommended value: 15 seconds
A Spanning Tree parameter that identifies the time interval between
Configuration BPDU messages as transmitted by a root bridge or a
bridge that is attempting to become the root bridge.
Recommended value: 2 seconds.
The (remote) Access Point RLM device that you selected to initiate a
Remote Link Test with a wireless station connected to the selected
Radio Link Module.
The Remote Link Test Partner can either be a wireless station, or
another RLM unit.
Industrial Ethernet Wireless LAN RLM Manager, CP 1515 Manager
C79000-G8976-C171-01 277