This read-only field reports the auto-generated sub-slot identifier, in the same slot/sub-slot format, for the second sub-slot in a redundancy pair, the counterpart to c64SubSlot1Name. An admin reads both fields together to confirm the exact pair of modular sub-modules backing each other up, which is a more granular check than the top-level slot pairing alone since a single slot can host multiple independently-redundant sub-slots. For example, if this reports '3/2' alongside a c64SubSlot1Name of '3/1', the two sub-modules within the same physical slot 3 are paired for redundancy with each other.