3.16. Operation of the FC-AL

3.16.1. Primitive Signals

Primitive signals are sent by a transmitting port, and recognized and acted on by a receiving port.

Table 3-3. Primitive Signals
Signal Description
ARB(x) Arbitrate address x for loop control
OPN(y) Open one other NL_Port

- - Full duplex

- - Half duplex

OPN(r) Replicate

- - Broadcast

- - Selective replicate or multicast

CLS Close the circuit at the NL_Port
MRK(tx) Synchronization signal “t” from “x”


The ‘x’ is the address of the port wanting to own the loop and the “y” is the address of the port to be opened.

3.16.2. Primitive Sequences

Primitive sequences are not recognized or acted on until the third consecutive occurrence of the ordered set. Currently, there are only three primitive ...

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