Owner manual

Product Description
6
Table 4 on page 6 details the purpose, color and functional description of each
LED.
Table 4: Front Panel LEDs
AT-MR901 Stacking Module
Models AT-MR912TX-10A, AT-MR912TX-20A or AT-MR912TX-30A have a
blank faceplate. The AT-MR901 Stacking Module is an optional feature on
these models.
Models AT-MR912TX-19A, AT-MR912TX-29A or AT-MR912TX-39A include
ATI’s AT-MR901 Stacking Module as a standard feature.
Table 5: AT-MR901TX Stacking Module
LED Color Description
Power (PWR) Green Lighted: Power on
Unlighted: Power off
Collision (COL) Amber Lighted: Data collision occurring
Link/Activity Green Lighted: Adapter connected to hub
Flickering: Data receiving
100Base-FX
Module
Green Lighted: Power on
Unlighted: Power off
Error Yellow Flashing: Data error occurring
Lighted: Partition and isolation of port
Utilization Green Hub traffic of the Fast Ethernet bandwidth
(1%, 8%, 16%, 32%, 64%)
Model Number Configuration AT-MR901 included?
AT-MR912TX-10A Standalone No
AT-MR912TX-19A Stackable Yes
AT-MR912TX-20A Standalone No
AT-MR912TX-29A Stackable Yes
AT-MR912TX-30A Standalone No
AT-MR912TX-39A Stackable Yes