Relationship between the OTS, OMS, and OCh layers

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An OTS trail is a trail between FIU boards or between OA boards at two sites. An OMS trail is a trail between MUX, DEMUX, or OADM boards at two sites. An OCh trail is a span between line boards.

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Relationship between OTS, OMS, and OCh layers of WDM devices
OTS is located between the FIU or OA boards of two sites. OMS is located between the MUX and DEMUX boards of two sites. OCh is a span on a single wavelength.

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