Section 2, Engineering Guidelines ATLAS 550 System Manual
28 © 2002 ADTRAN, Inc. 61200305L1-1F
Network Module
Status
Green (solid) the network interface is operating normally with error-free
operation. If the interface experiences alarms, the OK
LED remains off.
Yellow (solid) the interface is operating in a test mode. This includes a
self-test, a test pattern, or a test loopback. When
illuminated, this LED also indicates that normal data flow
is not occurring in the module ports.
Red (blink) an error such as BPV (bipolar violation), OOF (out of
frame), or CRC (cyclic redundancy check) has occurred.
Red (solid) an alarm condition has been detected. When the alarm
condition is no longer valid, the OK LED illuminates. To
view an alarm condition, select the active alarm menu
item. If the alarm conditions have been corrected, you
can view the alarm which caused the activation of the
ALARM LED in the system log.
Module Status Green (solid) one or both modules (in the case of a Resource Module)
are OK.
Green (fast blink) one or both modules (in the case of a Resource Module)
have been set offline by the user.
OR
one or both modules (in the case of a Resource Module)
have invalid flash memory.
Red (solid) a port on the installed module is currently in alarm.
Red (fast blink) one module has no response, has been removed, or is
not supported.
Red (slow blink) one module is not ready.
Off no module occupies the slot.
Module Online Green (solid) one or both modules (in the case of a Resource Module)
have an active connection.
Green (fast blink) one module has invalid flash memory or is downloading
firmware.
Green (slow blink) one module has an active connection.
Module Test Yellow (solid) one module is in a test mode.
Table 3. ATLAS 550 LEDs (Continued)
For these LEDs... This color light... Indicates that...