Patton electronic 2710 user manual Led Descriptions

5.0 OPERATION

Once the NetLink-T1™ is installed and configured properly it is ready to place into operation. This section describes the function of the LED indicators, and the use of the loopback and pattern test modes.

5.1 LED DESCRIPTIONS

The NetLink-T1™ is equipped with seven LED indicators that moni- tor the status of communication. Figure 4 (below) shows the location of the LEDs on the NetLink-T1™ Series front panel.

TXD	Model
RXD
LOS
ALM	2711
ERR
T/L
PWR

	Figure 4. Top of NetLink-T1™, Showing LED Indicators
TXD	When the unit sends a one, the TXD LED is
	turned on. When it sends a zero, the TXD
	LED is turned off. Moreover, the TXD LED
	is active only in active DS0 channels. In
	inactive channels, the TXD LED is off.
RXD	When the unit receives a one, the RXD LED
	is turned on. When it receives a zero, the
	RXD LED is turned off. Moreover, the RXD
	LED is active only in active DS0 channels.
	In inactive channels, the RXD LED is off.
	33

LOS	The Loss of Sync LED lights when the unit
	loses synchronization with the incoming sig-
	nal. 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 con-
	dition. 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 condi-
	tions, 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
	identical pattern. When it receives the cor-
	rect pattern, the LED will turn off. If error
	insertion is on, the LED will blink once a
	second if everything is operating properly.
TST	The test indicator LED blinks with a specific
	pattern depending on the type of test mode.
	When the unit is in local analog loop, the
	LED will blink on briefly. When the unit is in
	remote loop, the TST LED will blink off
	briefly. When the unit is sending a test pat-
	tern 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 powered. It turns off when the
	unit is not powered.
	34