This is the f3-platform counterpart to esaProbeCOSConfigSoamPmExtConDeltaTsForAvail: a read-write Unsigned32, ranging 1 to 1000, setting the number of consecutive delta_ts ('n') needed to flip availability state on f3-series cards, per its description. An administrator sets this to control how persistent a loss condition must be on an f3 card before it counts as a real unavailability event rather than a transient blip, mirroring the behavior on non-f3 hardware. For example, an operator wanting f3 cards to react as conservatively as other line cards would set this to the same 'n' value already used elsewhere.