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Chapter 2: Technical Specifications and Hardware Installation
AOC-SIM1U-3B/3B+ Add-on Card LED Indicators
Led indicators for the AOC-SIM1U-3B/3B+ add-on card are described in this section
below.
Standby Power LED Indicator (D3)
When this LED is on, the standby power is on. Be sure to remove power cables before
installing or removing components.
Heartbeat LED Indicator
The Heartbeat LED, located on the rear side of the AOC-SIM1U-3B/3B+ add-on card,
indicates the functionality and activity of the add-on card. This LED blinks when the
AOC-SIM1U-3B/3B+ add-on card is active.
However, after each AC power-on or reset, the Heartbeat LED is off for about a minute.
Then, the Heartbeat LED will be on again to indicate that the AOC-SIM1U-3B/3B+
add-on card is active. See
Table 2-2
Activity
On (Blinking)
Off (for 1 minute)
Off (Continuously)
for details.
Table 2-2. Heartbeat LED
Description
AOC-SIM1U-3B/3B+ add-on card active
Loading Firmware
AOC-SIM1U-3B/3B+ add-on card is not
active
2-5
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