Troubleshooting; Front Panel Leds - Black Box Echo Series User Manual

Echo 2 Mbps Multiplexer

Front Panel LEDs

On the front panel only the CARRIER LED should normally be lit.
LED LABEL
CARRIER
MAJOR Alarm
Minor Alarm
LOOP
28
SALES: 0118 965 5100

Troubleshooting

When the multiplexer is un-connected or
has lost carrier, the CARRIER LED will
flash slowly. A faster flash shows that
CRC4 sync hunt mode has been entered.
CONDITION
Slow Flash
Fast Flash
Steady Green
Red
Not illuminated
Red
Not illuminated
Not illuminated
Green
NOTES
No RX Carrier established
In CRC4 Mode, FAS present,
searching for CRC4
synchronisation.
CARRIER Synchronised
Red if a MAJOR Alarm condition
has occurred.
No MAJOR alarm condition.
Red if a Minor Alarm condition
has occurred.
No Minor alarm condition.
Normal run mode
If any Composite or data channel
looped or in a test mode.