This read-only Counter tallies the number of frames received on ingress that already had the FECN (Forward Explicit Congestion Notification) bit set by an upstream device. An administrator tracks this to detect congestion signaling arriving from further upstream in the network, independent of whether this switch itself later tags additional frames with FECN. For example, a rising rcvFramesFECN count on a channel indicates upstream congestion signaling is increasing, which an administrator would investigate at the network segment feeding this connection rather than at this switch itself.