Technical data

AlphaWave Users Manual 3/21/2005
include ES, SES, ESR, SESR, Unavailable Time, and Available Time
(see Figure 7-3):
• Errored Second (ES) - is a one-second period in which one or
more bits are in error.
• Severely Errored Second (SES) - is a one-second period which
has a bit error ratio more than 0.001
• Errored Second Ratio (ESR) - shows the ratio of ES to total
seconds in available time during a fixed measurement interval.
• Severely Errored Second Ratio (SESR) - shows the ratio of
SES to total seconds in available time during a fixed measure-
ment interval.
• Unavailable Time - begins when the Bit Error Rate (BER) in
each second is worse than 0.001 for a period of ten consecutive
second (shows period of ten consecutive seconds when the BER
in each second is worse than 0.001.)
• Available Time - begins when the first second of a period of ten
consecutive seconds each of which has a BER better than 0.001.
Figure 7-2: G.821 Statistics
The G.821 Statistics tab contains the following controls:
Page 7-2
Chapter 7