csDs3Ds1TotalBESs is a read-only PerfTotalCount counter reporting the number of Bursty Errored Seconds — a one-second period with 2 to 319 CRC errors, too many for a clean second but not enough to be Severely Errored — that this channelized DS1 (T1) circuit carried inside the DS3 has recorded summed across the entire previous 24-hour period, with any invalid 15-minute bucket counted as zero. A rising count here is the operational signal that sporadic, non-catastrophic noise on the DS1 is happening on that interface, which is exactly the kind of degradation a monitoring admin wants an early warning of before it causes an outage. For example, comparing csDs3Ds1TotalBESs's 24-hour rollup from one night to the next lets an admin judge whether sporadic, non-catastrophic noise on the DS1 on this channelized DS1 (T1) circuit carried inside the DS3 is a one-off blip or a worsening trend.