Dear friend!
FE_DCN_ASON is an ASON channel. The difference between DCN channels and common DCN channels is that DCN channels are used in ASON WDM networks. The channel bandwidth is greater than that of a common DCN channel. The channel bandwidth of D1-D12 is 12 x 64 kbit/s, and that of FE_DCN_ASON is 2 Mbit/s.
Thank you!