This read-only Counter holds the high-order 32 bits of the count of data octets transmitted by the local iSCSI node on this session, to be combined with cpqiScsiSsnLCTxDataOctets (actual count equals this value times 2^32 plus the low counter) for systems that don't support Counter64. An admin uses this pairing to track cumulative outbound data volume on high-throughput sessions that would overflow a single 32-bit counter. For example, on a session that has transferred many terabytes, an admin's monitoring script must read both this and the low-capacity counter together to compute the true transmitted byte total.