IBM DCS9550 1S1 - Manual (Page 21)

Introduction
6 IBM System Storage DCS9550 1S1 Storage Expansion Unit Installation, Service, and User Guide
FC Host Port 1
Signal Good Incoming FC signal is GOOD
No connection or incorrect connection
Invalid SFP connection Green
On
Off
Flashing
Router Status Storage Router Device Ready
Storage Router Device not ready or defective Green
On Off
ESI/SCM Module
Fault Fault present (also On when booting)
Successful controller initialization Amber
Off On
Figure 1–6 SCM I/O Module
Table 1–2 SCM I/O Module LEDs