L5105:LAPD_TX_RNR
This measurement provides the number of RNR frames that the BTS L2 sends on LAPD Link.
The RNR frame is a monitoring frame, which means that the local receiver is busy and is not ready to receive the next I frame. The RNR frame contains the serial number of the expected I frame. The peer end stops sending I frames on receiving the RNR frame.
If the BTS receiver is busy, the BTS sends an RNR frame to the BSC. The BSC stops sending I frames on receiving the RNR frame.
If the physical uplink is disrupted, the measurement result cannot be sent to the BSC and the value of this counter does not increase.
Integer number or integer.
This counter is measured when the BTS L2 sends an RNR frame on LAPD Link.
This is an original counter without involving any formula.