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8.4.2
Blocking switch emulation
When two NL_Ports open communication with each other (see the OPNyx discussion in Section 8.3), commu-
nication between other devices is effectively blocked (other than to retransmit frames or insert fill words). This
is known as a blocking environment since the two communicating ports block operation between any other
L_Ports.
8.4.3
Non-meshed environment
FC-AL is called a non-meshed environment due to the fact that there is only one route to any other port. A
meshed environment (like a fabric) is like a telephone system in which there are many routes possible between
two communicating entities.
Fibre Channel Interface Manual, Rev. D
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