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1.3 System Configuration
C141-E198 1-7
(6) Read/write circuit
The read/write circuit utilizes a read channel mounted with a head IC that supports high-speed
transmission and an MEEPR4ML (Modified Enhanced Extended Partial Response Class 4 Maximum
Likelihood) modulation/demodulation circuit in order to prevent errors being triggered by external
noise and to improve data reliability.
(7) Controller circuit
The controller circuit uses LSIs to increase the reliability and uses a high speed microprocessing unit
(MPU) to increase the performance of the SCSI controller.
1.3 System Configuration
For the Fibre Channel, the ANSI standard defines Arbitrated Loop, Fabric, and Point-to-Point
technologies. The MAS series disk drives support the Arbitrated Loop technology. Figure 1.3 gives
an example of the FC-AL system configuration.
Figure 1.3 Example of FC-AL system configuration
Any device connected to the Fibre Channel is called a node. The nodes shown in Figure 1.3
represent the initiator and individual disk drives. Each node has at least one port called an N_port.
For FC-AL, each port is called a Node-Loop port (NL_port).
The MAS series disk drive has two ports, one of which is used for connections to an FC-AL. A
maximum of 126 NL_ports can be connected to a single port.
BC
Port B
Initiator
(Node-1)
Drive
(Node-4)
BC
Port A
BC
BC
BC
BC
BC
BC
Port B
Port A
Port B
Port A
Port B
Port A
Drive
(Node-2)
Drive
(Node-3)