This read-write value picks what happens when an operational DLCI (Dlci) exceeds its committed burst but stays within its excess burst: setDeBit marks the Discard Eligibility bit in the Frame Relay header (asking the carrier's network to drop it first under congestion, rather than an interior device dropping it outright), while none (the default) takes no special action. An admin sets this to setDeBit to cooperate with the carrier's own congestion handling instead of relying solely on local discard behavior. Because this is the operational (Dlci-level) copy of the attribute, setting it here overrides the corresponding provisioned value on the underlying static entry without changing that provisioned default.