303-300-000C-02 – EMC Unity 300 / 400 / 500 / 600 Link Control Card (LCC) 12Gbps SAS
SPS Pros is dedicated to providing top quality EMC Unity components to keep your EMC Unity storage array running smoothly. This particular model with part number 303-300-000C-02 is used by the original EMC Unity 300/400/500/600 series. This EMC 12Gb/s Link Control Card is used in the 3.5″ 15 drive DAEs for the EMC Unity 300, 400, 500 & 600 series systems.
These EMC Unity LCC are used and come with a 60 day warranty.
EMC Unity Link control card functions and features for part number 303-300-000C-02
The LCC supports, controls, and monitors the DAE, and is the primary interconnect management element. Each LCC includes connectors for input and output to downstream devices.
The LCCs in a DAE connects to the storage processors and other DAEs. The cables connect the LCCs in a system in a daisy-chain topology.
Internally, each DAE LCC uses protocols to emulate a loop; it connects to the drives in its enclosure in a point-to-point fashion through a switch. The LCC independently receives and electrically terminates incoming signals. For traffic from the system’s storage processors, the LCC switch passes the signal from the input port to the drive being accessed; the switch then forwards the drive output signal to the port.
Each LCC independently monitors the environmental status of the entire enclosure, using a microcomputer-controlled monitor program. The monitor communicates the status to the storage processor, which polls disk enclosure status. LCC firmware also controls the SAS Phys and the disk-module status LEDs.
An enclosure ID, sometimes referred to as the enclosure address (EA), indicator is located on each LCC. Each LCC also includes a bus (back-end port) identification indicator. The SP initializes the bus ID when the operating system is loaded.