10
LTR-T Installation Guide
Power-up Sequence
This section explains the LTR-T power-up diagnostics and interpretation of the LED
display during normal operation. At the end of this section you will find suggestions for
troubleshooting problems with the unit as well as maintenance information.
LED Test
Upon turning on the LTR-T you will observe the power-up LED test sequence. The
status (STAT) LEDs will display a sequence of green, yellow, and red LEDs while a
single green LED follows along in the activity (ACT) row(s) of LEDs. The collision
(COL) LED should be red during this pattern. If the LEDs do not behave in this manner
then please refer ahead to the section on Troubleshooting.
Firmware Version
After the testing the LEDs, the LTR-T will display the firmware version of your LTR-T
unit. This display will last approximately 3 seconds and is indicated by all green STAT
LEDs. The firmware version will be displayed by the ACT LEDs numbered one (1)
through eight (8) in a binary format. A lit LED corresponds to a one (1) in that bit
position while an unlit LED corresponds to a zero (0) in that bit position. For example,
version 1.3 will be displayed as
(0)
(0)
(0)
(1)
(0)
(0)
(1)
(1)
off
off
off
green
off
off
green
green
Diagnostics
After displaying the firmware version, the LTR-T will display the results of the power-up
diagnostics tests if any type of failure was detected. Otherwise, the LTR-T will proceed
directly to status mode.
Diagnostic display mode is indicated by either all yellow or all red STAT and power
(PWR) LEDs. The diagnostic code is displayed using the ACT LEDs in a similar manner
as described above in the section on Firmware Version. In addition, the COL LED
contains information that may be useful in diagnosing problems with your LTR-T. Please
refer to Table 3 for a description of the diagnostic codes.
1.
The AUI-ACT LED should be off. The COL LED will be red if the unit is an
LTR-16T; the LED will be off if it is an LTR-8T. If the COL LED does not
reflect the true hardware type, it may indicate a hardware fault. Try cycling
power to the hub and see if the indication persists. If so, contact your dealer or
Lantronix.
2.
The diagnostic results will be shown on the upper right 9 LEDs - Table 3 explains
the meaning of the LED colors.
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