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Overhead tunnel is a feature to pass through overhead bytes transparently between east and west fibers. Overhead tunneling between two STM ports of a node can be created to bypass the management information carried between other nodes using DCC_R/SDCC or DCC_M/LDCC or F1 or E1 or E2 bytes, without processing these bytes.
NOTE: Bytes used for In-band communication cannot be used for configuring overhead tunnel.