This read-only Counter32 counts Forward RM cells received from the network on this Frame Relay channel, part of the ABR/traffic-management cell flow used to signal available bandwidth back toward the source. Watching this counter helps an admin confirm that the rate-management loop for the connection is actually active and cells are circulating as expected. If the count stays at zero on a channel that should be running ABR service, that's a sign the RM cell exchange with the far end isn't happening.