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aurora
Sonata
Hand Held ISDN Tester—User Guide
4-26 427869
-1-
Select
Threshold
from the
BERT Setup
menu.
The
BER
display shows the error rate that applies if the
currently selected number of errors occur within the selected
test time. The rate is shown as
x.yE-z
, where E-z means 10 to
the power of z. In the above example, the rate is 2.6x10
7
.
You can set the threshold either in terms of a number of errors
or as an HRX percentage. HRX (Hypothetical Reference
Connection) is a model used to study the performance of
ISDN, where the percentages represent the allocation of
degraded minutes and errored seconds. For details, refer to
ITU-T Recommendation G.821.
-1-
Select
Mode
from the
BERT Setup
menu to
display an option window.
-2-
Choose either
Bit Errors
—set a number of
errors as the threshold, or
HRX
—choose an
HRX percentage, and press ENTER . The
option window closes.
To set the threshold as a number of errors (i.e.
Mode
is set to
Bit Errors
):
-1-
Select
Errors
from the
BERT Setup
menu to
display an entry window.