Chapter 5.Loop Back & BERT Testing
56
May 2011
Display:
The ETU-01A maintains an alarm buffer. The buffer can store an alarm event of each type
below along with the time of occurrence. A maximum of 256 alarms may be stored and displayed
on the front panel LCD through the ALARM BUFFER DISPLAY menu or the terminal connected
to the Control Port. Table 5-2, below, presents the alarm messages generated by the ETU-01A.
Table 5-2 Alarm Message
Message Description Corrective Actions
Alarm
type
POWER
TURN
Power ON/OFF time. ON/OFF
BRG1
FAILURE
The data port baud rate generator
has failed. Only tested at power
on.
Check the clock mode of the user data
channel or Replace the ETU-01A.
ON
FIFO1
SLIP
The data port FIFO buffer
suffered an overflow or
underflow, usually caused by
inconsistencies in clock rates.
Check the clock mode of the user data
channel or Replace the ETU-01A.
ON
E1 SIG.
LOSS
Loss of E1 link receive signal.
Check cable connections to the E1 line
connector and the other equipment
providing the link to the ETU-01A.
ON/OFF
E1 SYNC
LOSS
Loss of E1 link frame sync.
Check cable connections to the E1 line
connector and the other equipment
providing the same frame link to the
ETU-01A or Replace the ETU-01A.
ON/OFF
E1 LINK
BPV
Bipolar violations in the E1 link
receive signal. Updated once per
second.
Check that line attenuation does not
exceed that specified for E1 line.
Check other equipment providing the
same line code to the ETU-01A.
ON
E1 CRC4
ERR
CRC-4 errors detected in E1 link
receive signal. Updated once per
second.
Check other equipment providing the
same frame link to the ETU-01A.
ON
E1
FRAME
SLIP
E1 link frame slips are detected.
Updated once per second.
Incorrect selection of master clock
source or problem with the equipment
connected to the remote end of the link,
unstable clock source.
ON
E1 LINE
AIS
E1 link receiving an all ones
signal.
Problem with the equipment connected
to the remote end of the link.
ON/OFF
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