Chapter 9 Troubleshooting
Resolving problems
SmartClass E1 Tester User’s Guide 109
E1 testing
Table 34 describes situations that you may encounter when using the Smart-
Class E1 tester.
Table 34 Problems and resolutions
Issue Description Resolution
No signal present This occurs when there is
no valid input connected to
the SmartClass.
Make sure the cables are
connected to the receiver
and that the signal con-
sists of valid data.
Alarm Indication
Signal (AIS)
detected
This alarm is displayed
when an unframed “all
ones” pattern is received.
This is usually generated
by network equipment to
indicate a fault or lack of
data on the line.
Clear the fault and restart
the test.
Pattern synchroni-
zation is not
achieved
The error is displayed
when an input signal is
detected but the incoming
data pattern is different to
the test pattern selected in
the BERT setup.
Check the test pattern.
Make sure the correct one
is selected.
Frame synchroniza-
tion is not achieved
The SmartClass cannot
recognize a frame within
the received signal.
Check the framing type
used on the line and
change the E1 setup
accordingly.
Code errors
detected
This error occurs when the
polarity of a received pulse
does not match the rules of
the line code. It is normally
seen when AMI is
expected but HDB3 is in
use on the line.
Check that the line code
parameter is set correctly.
In Monitor mode,
the Sync and Data
LEDs are red even
though frame syn-
chronization and
pattern synchroni-
zation are present
on the Rx1 inter-
face.
The SmartClass E1 moni-
tors the RX1/TX1 and
RX2/Ext Clk interfaces
simultaneously. The Sync
and Data LEDs will be
green only if both receivers
have frame and pattern
synchronization, respec-
tively.
To monitor a single E1
interface, select Monitor
mode, and then configure
the settings for the moni-
tored interface.
Be certain to use the RX1
connector; the RX2/Ext Clk
connector should not be
used when monitoring a
single interface.
Received NOSIG
DATA alarm
This happens in the Pulse
Shape application when
the captured pulse does
not fall between the maxi-
mum and minimum mask.
Run the test again.
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