This counter reports the number of Coding Violations (BIP errors) encountered at the Section layer during one specific historical 15-minute interval in the past 24 hours. An admin cares because tracking CV counts across all 96 historical intervals reveals the error-density trend over the day, helping distinguish a link that's been steadily degrading from one with a single isolated bad interval. For example, CV counts that climb gradually interval over interval throughout the day suggest a developing physical issue like a slowly failing transceiver, rather than a one-off glitch.