This Gauge32 records the completed count of NetBIOS packets filtered by the STU during the previous 15-minute period. Because Windows file/print browsing generates NetBIOS broadcasts continuously while devices are on, a consistent nonzero previous-period value indicates ongoing background chatter from the subscriber's LAN rather than a one-time event. For example, comparing hcxStuIpPrevNetbiosFiltStat across several periods for a household with multiple Windows PCs would show a fairly steady baseline of filtered NetBIOS broadcasts.