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366 Fibre Channel Interface Manual, Rev. D
Center wavelength (LED)
The average of the two wavelengths measured at the half amplitude points of the power spectrum.
Centre wavelength (laser)
The nominal value of the central wavelength of the operating, modulated laser. This is the wavelength where
the effective optical power resides.
Character
Any Transmission Character associated by FC-1 transmission code with a FC-2 data byte or special code.
Transmission characters are generated and interpreted only by FC-1.
Circuit
A bidirectional path within the Fabric.
Class 1 service
A service which establishes a dedicated connection between communicating N_Ports.
Class 2 service
A service which multiplexes frames at frame boundaries to or from one or more N_Ports with acknowledge-
ment provided.
Class 3 service
A service which multiplexes frames at frame boundaries to or from one or more N_Ports without acknowledge-
ment.
Class 4 bidirectional circuits
A pair of unidirectional virtual circuits between two communicating N_Ports.
Class 4 Circuit Initiator
The N_Port which initiates the setup of a Class 4 circuit.
Class 4 Circuit Recipient
The N_Port which accepts a Class 4 circuit with the Originator N_Port.
Class 4 end-to-end credit limit
The maximum amount of end-to-end credit available for a virtual circuit. It represents the maximum number of
Class 4 end-to-end credit held by an N_Port on a given virtual circuit.
Class 4 service
A service that establishes virtual circuits to provide fractional bandwidth service between communicating
N_Ports. The service multiplexes frames at frame boundaries to or from one or more N_Ports with acknowl-
edgment provided.
Class l/SOFcl
Class 1 frame with a SOFcl delimiter.
Classes of service
Different types of services provided by the Fabric and used by the communicating N_Ports.