Answer Posted / pachicoo

FECN=Forward Explicit Congestion Notification bit

Explicit congestion notification is proposed as the
congestion avoidance policy. It tries to keep the network
operating at its desired equilibrium point so that a
certain Quality of Service (QOS) for the network can be
met. To do so, special congestion control bits have been
incorporated into the address field of the frame relay:
FECN and BECN. The basic idea is to avoid data accumulation
inside the network. FECN means Forward Explicit Congestion
Notification. The FECN bit can be set to 1 to indicate that
congestion was experienced in the direction of the frame
transmission, so it informs the destination that congestion
has occurred. BECN means Backwards Explicit Congestion
Notification. The BECN bit can be set to 1 to indicate that
congestion was experienced in the network in the direction
opposite of the frame transmission, so it informs the
sender that congestion has occurred.

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