Specifications

TurboStack Series Hubs
29
LED Displays
Hub Indicators LED indicators appear on each AT-TS12FS/ST, SC, SM hub. The LEDs
intentionally do not reflect real-time activity, because a data packet is too
fast for the human eye to distinguish on the LED indicator; therefore, the
hub artificially stretches the LED ON time for observation. LED
indicators for the AT-TS12FS hub series are described below:
POWER—Green whenever power is applied.
FAULT (OFF under normal operational conditions)—Stays red for a very
short time at power-up; remains solid red if a malfunction is detected
during the diagnostics.
ACTIVITY—The Activity indicator will flash when Ethernet packets are
being transmitted to all hub ports.
Port Indicators The port indicators on the AT-TS12FS/ST, SC, SM hub front panels
provide visual diagnostic and activity information for network analysis.
Figure 20, for example, shows the port indicators appearing on the front
panel of the AT-TS12FS/ST module.
Each fiber optic port supports the following indicator functions with one
front panel LED per port:
STEADY GREEN—This indicates that the port has a valid link and is
not partitioned.
FLASHING GREEN—This indicates that the port has a valid link, is not
partitioned, and is receiving data.
STEADY AMBER—This indicates that the port has a valid link and is
partitioned.
Figure 20: AT-TS12FS/ST
Port Indicators
Port activity LEDs
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