User Manual

ADCP-75-159 • Issue 1 • August 2003 • Section 5: Maintenance
Page 5-4
© 2003, ADC Telecommunications, Inc.
Table 5-3. Spectrum Transport Module LED Indicators
INDICATOR COLOR DESCRIPTION
AC POWER
Green
Red
Indicates if the STM is powered by the AC power source or
the back-up battery system.
The STM is powered by the AC power source.
The STM is powered by the back-up battery system.
STANDBY
Green (blinking)
Yellow (blinking)
Red (blinking)
Off
Indicates if the system is in the standby, normal, test, or
program load mode.
The STM is in the standby mode.
The STM is in the program load mode.
The STM is in the test mode.
The STM is in the normal mode.
HOST UNIT
Green
Yellow
Red
Indicates if an alarm is detected at the HU.
No alarms detected at the HU.
A minor alarm is detected at the HU.
A major alarm is detected at the HU.
STM
Green
Yellow
Red
Indicates if the STM is normal, over temperature, or if a
fault is detected.
The STM is normal.
The STM is over temperature due to high ambient temperature
or the fan has failed.
Fault detected by the STM or HU/RU band mismatch.
PA
Green
Yellow
Red
Indicates if the LPA is normal, over temperature, has a fan
failure, or is faulty.
The LPA is normal.
The LPA is over temperature or the fan has failed.
Internal fault detected in the LPA.
VSWR
Green
Red
Indicates if the forward path VSWR is above or below the
threshold.
The VSWR is below the threshold.
The VSWR is above the threshold.
PORT 1/PORT 2
Green
Red
Indicates if the forward/reverse path optical signals from
the HU/STM are normal, if errors are detected, or if the
optical signal is not detected.
The forward/reverse path optical signal is normal.
Excessive errors (see Note) are detected in the forward or
reverse path optical signals or the STM or HU is not receiving
a forward or reverse path optical signal.
Note: Excessive errors mean the Bit Error Rate (BER) has exceeded 10
–6
(1 bit error per million bits)