This read-write floating-point object sets the high-water-mark Blocks Error Rate above which the terminal raises a link BLER alarm, flagging that an unusual proportion of data blocks are arriving with errors. An administrator tunes this to catch block-level degradation that might not show up as clearly in the raw bit error rate. For example, a rising BLER on an otherwise acceptable-BER link could indicate a framing or synchronization issue worth investigating before it worsens.