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Figure 40. Rear LEDs, controls, and connectors
Seven-segment numeric display
The numeric display consists of two seven-segment LEDs that provide information
about enclosure identification and diagnostics. Figure 41 on page 63 shows the
numeric display and the diagnostic LED.
62
IBM System Storage DS4000 EXP420 Storage Expansion Enclosure: Installation, User's and Maintenance Guide
1
2 3
6
A
ESM
9
8
7
Table 18. Rear LEDs, controls, and connectors
Number
LED
1
ESM Power
2
ESM Fault
3
ESM Service Action
Allowed (OK to Remove)
4
ESM Port 1 In Bypass
(This port is labeled 1A)
5
ESM Ports 1 & 2
2 or 4 Gbps Data Rate
6
ESM Port 2 In Bypass
(This port is labeled 1B)
7
ESM Port 3 In Bypass
(This port is labeled 2A)
8
ESM Ports 3 & 4
2 or 4 Gbps data rate
9
ESM Port 4 In Bypass
(This port is labeled 2B)
5
4
7
4
5
6
1
2
Normal Status
On
Off
Off
Off - Cable connected
On - No cable connected
One LED is lit if 2 Gbps
Both LEDs are lit if 4
Gbps
Off - Cable connected
On - No cable connected
Off - Cable connected
On - No cable connected
One LED is lit if 2 Gbps
Both LEDs are lit if 4
Gbps
Off - Cable connected
On - No cable connected
8
9
B
ESM
exp81022
3
Problem Status
Off
On
On
On, blinking for 30
seconds
N/A
On, blinking for 30
seconds
On, blinking for 30
seconds
N/A
On, blinking for 30
seconds
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