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150-319-205-05, Issue 5
S
A
YSTEM
Table 18
lists possible ELU-319 List 5E and List 6E alarm states. The accompanying front panel message is listed
in the Alarm column. More than one alarm condition can exist at any given time, but only one message can be
displayed. For multiple alarms, only the highest priority alarm displays.
Front-Panel
Alarm
Message
ALRM LOSW
Loss of Sync
(1)
Word
ALRM LLOS
Local Loss of Signal Loss of the G.703 input signal.
ALRM RLOS
Remote Loss of
Signal
ALRM TLOS
Transmit Loss of
Signal
ALRM BER
Bit Error Rate
exceeded
ALRM MAL1
Margin Alarm
or
Loop1
ALRM MAL2
or
Margin Alarm
Loop2
(1) When both HDSL loops lose sync word (LOSW), a system alarm condition exists. However, since the ELU-319 enters a self
test cycling mode, the front panel LED lights yellow instead of red, and the SELF TEST message is displayed instead of the
ALRM message.
R
S
ETIRING
YSTEM
To retire a system alarm, press the SEL button and execute an Alarm Cut Off (ACO). An ACO turns the alarm off
and replaces the ALRM message with an ACO message. The second part of the ALRM message, which defines the
cause of the alarm, remains. Both parts of the message remain until the alarm condition clears or another higher
priority alarm occurs.
S
T
ELF
EST
The Self Test mode that occurs when both HDSL loops are not in sync has been enhanced to include the input
G.703 transceiver chip. The Self Test procedure can cause the AIS pattern, which is normally transmitted from
the ELU-319 during these out of sync intervals, to exhibit occasional BPVs.
ELU-319 List 5E and List 6E
LARMS
Table 18. HDSL System Alarms
Description
One of the HDSL loops has lost
synchronization.
Loss of the ERU G.703 input signal.
The G.703 input is not present at the ERU.
Places the ERU in loopback towards the
network.
The combined E1 and HDSL BER has
exceeded set threshold limits of 10
- 7
or 10
.
The margin on HDSL Loop 1 or Loop 2 has
dropped below the minimum threshold
value set by the terminal MARGIN ALARM
THRES.
A
LARMS
January 26, 2000
To inhibit:
Cannot be inhibited.
Cannot be inhibited.
Disable the RDA (Remote G.703 Alarm)
option. This prevents an LOS condition at
the G.703 input to a ERU 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 toward the network from the ELU.
This option prevents the common
occurrences of a CPE LOS condition from
generating recurring alarms and AIS
payloads.
Set the TLOS switch at the ERU to disable.
Select NONE for the BER system option.
-6
Set the Margin Alarm Threshold option to 0
(zero).
System Alarms
41
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