User Manual

ADCP-75-179 • Preliminary Issue A • September 2004 • Section 4: maintenance
Page 4-4
© 2004, ADC Telecommunications, Inc.
Table 4-2. 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, if a bat-
tery fault is detected, if an internal fault is detected, or if
there is an equipment mismatch.
The STM is normal.
The STM is over temperature due to high ambient tempera-
ture, the fan has failed, or detects an internal fault.
The STM detects an internal fault, the backup battery voltage
is below threshold, or HU/RU band mismatch.
PA
Green
Yellow
Red
Indicates if the LPA is normal, over temperature, has a fan
failure, has an internal fault, is shutdown, or not present.
The LPA is normal.
The LPA is over temperature or the fan has failed.
Internal fault detected in the LPA, the LPA RF power output is
shutdown, or the LPA is not present.
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.
FWD/REV
(PORT 1/PORT 2)
Green
Red
Indicates if the forward path optical signals from the HU
are normal, if errors are detected, or if the optical signal is
not detected.
The forward path optical signals are normal.
Excessive errors (see Note) are detected in the forward path
optical signal or the STM is not receiving the forward path
optical signal.
Note: Excessive errors means the Bit Error Rate (BER) has exceeded 10
–6
(1 bit error per million bits).