User Manual

ADCP-75-110 • Issue 2B • July 2001
Page 42
© 2001, ADC Telecommunications, Inc.
Table 8. Digital Expansion Unit LED Indicators
INDICATOR COLOR DESCRIPTION
UNIT
LED
Green
Yellow
Red
Off
Indicates when the DEU is normal or faulty.
DEU in normal state, no faults detected.
DEU in power-up state or DEU high temperature fault detected. (see Note)
DEU internal fault detected. (see Note)
AC power off to DEU or DEU internal fault.
HOST PORT
LED
Green
Red
(steady or
blinking)
Off
Indicates when the optical inputs from the DHU or supporting
DEU are normal or lost.
DHU or supporting DEU in normal state, no faults detected.
No forward path optical signal from DHU or supporting DEU detected
or excessive forward path errors detected. (see Note).
DEU internal fault.
PORT 1–6
OK/NOK
LEDs
Green
Yellow
Red
Red
(blinking)
Off
Indicates if any connected DEU or DRU is normal or faulty or if the
optical inputs from any connected DEU or DRU are normal or lost.
DRU or remote DEU in normal state, no faults detected.
DEU in power-up state.
Fault detected in any connected DEU or DRU, *no reverse path optical
signal from any connected DEU or DRU detected, or excessive reverse
path errors detected from any connected DEU or DRU. (see Note)
*No reverse path optical signal from any connected DEU or DRU
detected.
Port disabled (via front panel switch) or DEU internal fault.
*Early versions of the DEU use a steady red LED to indicate all major
fault conditions. Later versions of the DEU use a blinking red LED to
indicate no optical signal received from the connected DRU or DEU.
Note: Detection of any fault will generate an alarm. A high temperature fault will generate a minor
alarm (yellow LED). All other types of faults will generate a major alarm (red LED).
Table 9. Digital Remote Unit LED Indicator
INDICATOR COLOR DESCRIPTION
STATUS
LED
Green
Yellow
Red
Red
(blinking)
Off
Indicates if the DRU is normal or faulty or if the forward path optical
inputs to the DRU are normal or lost.
DRU in normal state, no faults detected.
DRU in power-up state.
DRU internal fault detected, *no forward path optical signal detected, or
excessive forward path errors detected. (See Note)
*No forward path optical signal from the DHU or DEU detected.
DC power off to DRU or DRU internal fault.
*Early versions of the DRU use a steady red LED to indicate all major
fault conditions. Later versions of the DRU use a blinking red LED to
indicate no optical signal received from the DHU or DEU.
Note: Detection of any fault will generate an alarm. A high temperature fault will generate
a minor alarm (yellow LED). All other types of faults will generate a major alarm (red LED).