PairGain HiGain SOLITAIRE H2TU-C-319 List 1, Техническая практика

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152-319-100-02, Revision 02 Troubleshooting
H2TU-C-319 List 1 and List 1C April 21, 2000 37
T
ROUBLESHOOTING
This section provides information about front-panel system alarms, LOS/AIS response, the OCT55 test procedure,
and loopback testing.
F
RONT
-
PANEL
S
YSTEM
A
LARMS
Table 14 lists possible H2TU-C-319 List 1 alarm states in order of priority as they appear on the front panel. These
alarms correlate with the alarms displayed on the alarm history screens (see “Using the Performance Screens to
View Performance Data” on page 26 ), however, the screens provide a more detailed analysis. More than one alarm
condition can exist at any given time, but only one message can be displayed on the front panel. For multiple
alarms, only the highest priority alarm displays.
Table 14. Front-panel System Alarms
Front-Panel
Message
(a)
Alarm Description To Inhibit:
SHRT
(c)
Short A short exists between the Tip and Ring of the
HDSL2 pair. Cannot be inhibited.
GND
(c)
Ground The HDSL2 loop is grounded. Cannot be inhibited.
OPEN
(c)
Open A line power open condition exists. Cannot be inhibited.
LOSW Loss of Sync Word
(b)
The HDSL2 loop has lost synchronization. Cannot be inhibited.
LLOS Local Loss of Signal Loss of the DSX-1 input signal. Cannot be inhibited.
RLOS Remote Loss of Signal Loss of the H2TU-R DS1 input signal. Disable the RDA (Remote Disconnect
Alarm) option. This prevents an LOS
condition at the DS1 input to a H2TU-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 H2TU-C.
This option prevents the common
occurrences of a CPE LOS condition
from generating recurring alarms and
AIS payloads.
LAIS Local Alarm Indication
Signal Indicates an AIS (all ones) pattern is being
transmitted from the local DS1 output port. Cannot be inhibited.
RAIS Remote Alarm
Indication Signal Indicates an AIS (all ones) pattern is being
received at the H2TU-R DS1 input port. Cannot be inhibited.
LRAI Line RAI—Remote
Alarm Indication at the
H2TU-R Indicates an RAI alarm (yellow) from the CPE
with an error-free signal from the line unit or
network. Cannot be inhibited.
RRAI Remote RAI—Remote
Alarm Indication at the
H2TU-R Indicates an RAI alarm (yellow) from the CPE
with errors from the line unit or network. Cannot be inhibited.
DBER DS1 Bit Error Rate The DS1 BER has exceeded the set 24-hour
threshold limit of approximately 10
-6
.
Select DIS for the DBER system option.
LOF Loss of Frame The DS1 input does not contain the ESF or SF
frame pattern setting of the FRMG option. Change FRMG option to AUTO or UNFR.