AT&T System 25 - Manual (Page 64)

INSTALLATION
Table 2-D. Circuit Pack LED Status Indications
Circuit Pack Type LEDs if Normal LEDs if Failed
Service Circuit (ZTN85 Steady Green and Steady Red or
or ZTN131 [R3]) Flashing or Amber Off
Steady Amber
CPU/Memory (ZTN129 Flashing Green Steady Green
or ZTN130 [R3]) or Off
All Other Steady Green Steady Red
(Amber Also lighted (see Note below)
when CP in use)
Note: The red and green LEDs can both be lighted at the same
time. In normal operation, a lighted red LED indicates that
an alarm has been recorded for that CP. If the green LED is
also lighted, the main processor can communicate with the
CP. A lighted amber LED indicates that a resource on the
CP is being used. A lighted red LED and a dark green LED
indicates that the CP diagnosed itself to be so bad that it has
removed itself from the system.
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