This sets the absolute maximum length of the VBR-RT queue, beyond which the card discards all cells regardless of CLP marking, the VBR-RT counterpart to cardClp01CbrThreshold. Like its CBR counterpart, reaching this threshold means even non-discard-eligible VBR-RT cells start getting dropped, a more severe congestion event than the earlier CLP-1-selective threshold for the same queue class. For example, an admin monitoring for discards at this specific threshold on the VBR-RT queue treats it as evidence that even guaranteed real-time variable-bit-rate cells, not just discard-eligible ones, are now being lost.