Patton electronic 2710 - Manual (Page 34)

34
LOS– The Loss of Sync LED lights when the unit loses synchroniza-
tion with the incoming signal. This may happen when there is a fram-
ing mismatch or a loss of signal. In unframed mode, the LOS LED
monitors the status of the transmit clock.
ALM– The alarm LED indicates the presence of a Blue or Yellow
Alarm, or Out of Frame condition. The ALM LED will blink on every
half-second. Alarms may occur due to:
• Loss of Synchronization
• Loss of Frame
• AIS (Blue Alarm)
• RAI (Yellow Alarm)
ERR–The error LED indicates various error conditions, including
framing bit errors, excessive zeros, controlled slips, severe errors, or
bit errors (when sending V.52 test patterns). When sending a test
pattern, the LED will remain lit if the unit does not receive the identi-
cal pattern. When it receives the correct pattern, the LED will turn
off. If error insertion is on, the LED will blink once a second if every-
thing is operating properly.
TST– The test indicator LED blinks with a speciÞc pattern depending
on the type of test mode. When the unit is in local analog loop, the
LED will blink on brießy. When the unit is in remote loop, the TST
LED will blink off brießy. When the unit is sending a test pattern or is
putting the remote unit into V.54 loopback, the TST LED will stay on.
These are the test modes:
• V.54 Loopback & V.52 Patterns
• D4 Line Loop (CO initiated)
• ESF Line Loop (CO Initiated)
• ESF Payload Loop (CO Initiated)
PWR– The power indicator LED will remain lit while the unit is pow-
ered. It turns off when the unit is not powered.