Dell SC400, SC420, and SC420F Expansion Enclosure Owner's Manual

The SC400 Series includes two enclosure management modules (EMMs) in two interface slots.

Figure 1. SC400 Series Expansion Enclosure EMM Features and Indicators

Features and indicators on the SC400 Series EMM.

Item	Name	Icon	Description
1	SAS port status (1–4)		Green: All the links to the port are connected Amber: One or more links are not connected Off: Expansion enclosure is not connected
2	EMM status indicator		On steady green: Normal operation Amber: Expansion enclosure did not boot or is not properly configured Blinking green: Automatic update in progress Blinking amber (two times per sequence): Expansion enclosure is unable to communicate with other expansion enclosures Blinking amber (four times per sequence): Firmware update failed Blinking amber (five times per sequence): Firmware versions are different between the two EMMs
3	SAS ports 1–4 (Input or Output)		Provides SAS connections for cabling the storage controller to the next expansion enclosure in the chain. (Single Port, Redundant, and Multi-chain Configuration).
4	USB Mini-B (serial debug port)		Not for customer use.
5	Unit ID display		Displays the enclosure ID.