Which types of endpoint are optical channel client connections made?

Between which types of endpoint are optical channel client connections made?
A. wavelength add/drop ports
B. transponder client ports
C. transponder trunk ports
D. optical service channel ports

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One thought on “Which types of endpoint are optical channel client connections made?

  1. Good reference diagram here: https://www.cisco.com/c/en/us/td/docs/optical/15000r9_0/dwdm/reference/guide/454d90_ref/454d90_optcircuitref.pdf

    Optical Channel Circuits consist of three component “circuits”:

    – OCH CC (Optical Channel Client Circuit) – This is the representation that the client sees, a “circuit” that spans the entire transport network, from client-facing port on a transponder/muxponder on one end of the network to a client-facing port on a transponder/muxponder on the other end.

    – OCH Trail (Optical Channel Trail Circuit) – This is the slightly smaller (but not much) circuit between the line-facing port on a transponder/muxponder on one end of the network to a line-facing port on a transponder/muxponder on the other end.

    – OCH NC (Optical Channel Network Circuit) – This is the circuit between the add/drop port on a ROADM to the add/drop port on the ROADM on the other end of the network.

    So the client connections are made between transponder/muxponder client-facing ports. (The answer listed as correct, “optical service channel ports”, is not correct. Those are in the very interior of the DWDM transport network, representing the connections for degrees interconnecting ROADMs. The client connections would not be made there.)

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