ADC HDSL4, H4TU-C-319 List 1 Line Unit user manual Testing, Front-Panel System Alarms, PWR Feed

Testing LTPH-UM-1031-03, Issue 3

TESTING

This section provides information about front-panel system alarms, LOS and AIS response, the OCT55 test procedure, and loopback testing.

SYSTEM ALARMS

Table 15 summarizes all possible system alarms in order of priority as they appear on the front panel. When multiple alarms occur, the front-panel display only reports the highest priority alarm. The alarm history screens display alarms also, but provide greater detail (see “Using the Performance Screens to View Performance Data” on page 28). Alarms that are not inhibited will drive the front-panel Status LED to a flashing red alarm state.

Table 15. Front-Panel System Alarms

Front-Panel	Alarm	Description	To Inhibit:
Message (a)
PWR FEED	Power Feed Short	A short exists between Loop 1 and Loop 2 of	Cannot be inhibited.
SHRT (b)		the HDSL4 pair.
PWR FEED	Power Feed Ground	One of the HDSL4 loops is grounded.	Cannot be inhibited.
GND (b)
PWR FEED	Power Feed Open	A line power open condition exists.	Cannot be inhibited.
OPEN (b)
SPNn-LOSW	Span(n)-Loss of Sync	The HDSL4 loop has lost synchronization.	Cannot be inhibited.
	Word (c)	The span closest to the network has highest
		priority.
LLOS	Line (Unit) Loss of	Loss of the DSX-1 input signal.	Cannot be inhibited.
	Signal
RLOS	Remote (Unit) Loss of	Loss of the H4TU-R DS1 input signal.	Disable the RDA (Remote Disconnect
	Signal		Alarm) option. This prevents an LOS
			condition at the DS1 input to a H4TU-R
			from activating pin H. The front-panel
			Status LED still flashes red and the ALRM
			RLOS message displays to alert you of the
			LOS state. LOS is sent towards the
			network from the H4TU-C. This option
			prevents the common occurrences of a
			CPE LOS condition from generating
			recurring alarms and AIS payloads.
LAIS	Line Alarm Indication	Indicates an AIS (unframed all ones) pattern	Cannot be inhibited.
	Signal	is being received at the H4TU-C DS1 input
		port.
RAIS	Remote Alarm	Indicates an AIS (unframed all ones) pattern	Cannot be inhibited.
	Indication Signal	is being received at the H4TU-R DS1 input
		port.

LRAI	Line RAI—Remote
	Alarm Indication at the
	H4TU-R (Net signal
	does not have errors.)

Indicates an RAI alarm (yellow) from the CPE Cannot be inhibited. with an error-free signal from the line unit or

network. RAI signal is transmitted towards the network.

Continued

42 September 12, 2003 H4TU-C-319 List 1