This read-write flag enables or disables the sending of ABR Resource Management (RM) cells on this channel, which carry rate-feedback information used by ABR flow control between the two ends of a connection. Admins enable this for ABR-service-type connections that rely on RM cell exchange to dynamically adjust their sending rate based on network congestion feedback. For example, disabling ausmChanRMEnable on a connection that's supposed to use standard ABR flow control would prevent it from participating in the RM-cell-based rate negotiation, likely causing it to behave more like a fixed-rate connection instead.