TxUtilization is a read-only Gauge32 giving the percentage of wire speed consumed by only the transmitted traffic in this MAC-to-MAC conversation; the MIB specifies dividing the raw value by 1000 to get the real percentage, so a reading of 132 means 0.132%. Because it isolates one direction, this object lets an admin tell whether a near-saturated link is being driven mostly by outbound or inbound traffic for that specific conversation. A raw TxUtilization reading of 80000 (80% wire speed) for the pair 00:1A:2B:3C:4D:01/00:1A:2B:3C:4D:02, while the opposite direction sits near zero, points to a heavily asymmetric conversation dominated by outbound traffic.