This counts errored blocks -- E1 frames in which at least one bit was corrupted -- detected on this E1 port. EB is the broadest block-error counter in this table, since SES and most BBE events are drawn from it, so a rising EB count on this port, even before SES climbs, is the earliest sign of block-level corruption worth checking -- and this specific object covers the current, still-open 24-hour interval -- the earliest daily-scale warning available before the full day's history bin closes. For example, so far in the current, still-running 24-hour interval, this E1 port might show this counter at 202 -- a concrete count the admin can trend against neighboring bins to judge whether the condition it reflects is worsening.