This is a read-create setting that specifies the transformation applied to the 'B' signaling bit of the incoming ABCD pattern, mirroring the A-bit action object but acting on the second signaling bit. An admin sets this independently of the other three bits because CAS signaling conventions can require different handling for each bit position. For example, a telco interconnect might need only the B-bit inverted while A, C, and D pass through unchanged, which this object lets the admin configure precisely.