What is an interconnected network of independent fabric for B-Series switches?

CSAN (Converged SAN) is not a recognized Brocade B-Series term and does not describe any standard inter-fabric or fabric partitioning technology in that product line.

In Brocade B-Series switch architecture, an LSAN is a logical grouping of devices spread across multiple independently administered Fibre Channel fabrics that are connected using FC Routing (FCR). FCR allows inter-fabric communication without physically or administratively merging the fabrics, preserving each fabric's independence while enabling selective device-level connectivity across fabric boundaries.

VSAN (Virtual SAN) is a Cisco MDS/Nexus concept for creating logical partitions within a single physical fabric; Brocade B-Series uses a different architecture and does not use the VSAN terminology.

TSAN (Transparent SAN) is not a standard term in Brocade or any mainstream B-Series SAN technology and does not describe an inter-fabric networking model.