EXFO ETS-1000G - Manual (Page 156)

Reference Tables
146 ETS-1000G
ECN Values
EF— Expedited Forwarding. It is used for processing the
deference-sensitive traffic that requires the minimum jitter, such as video
or voice (VoIP; Voice over IP).
ECN Values
ECN (Explicit Congestion Notification) — an explicit notification of
congestion. Setting bits in this field allows routers to detect congestion on
the data transmission path to the specified network node without
discarding a packet.
Value Description
00 Not-ECT (Not-ECN-Capable Transport) — traffic that does not support
ECN.
01 ECT (1) (ECN-Capable Transport) — traffic that supports ECN.
10 ECT (0) (ECN-Capable Transport) — traffic that supports ECN. Routers
treat it similarly to ECT (1).
11 CE (Congestion Experienced) — confirmed congestion.