Wave Wireless Networking SC5800, Руководство пользователя, Страница: 57 / 108

SPEEDCOM SC5800 User Manual
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6.7.2.1 G.826 Thresholds
Three G.826 thresholds are provided for each monitored link. Each of these ratios is
calculated once every second and will trigger a fault condition if the ratios exceed the
programmed thresholds that are:
•
Errored Second Ratio Threshold – this threshold which defaults to 4 X 10-2
triggers an alarm if the calculated ESR exceeds this value over the measurement
period (Report Time).
•
Severely Errored Second Ratio Threshold – this threshold which defaults to 2
X 10-3 triggers an alarm if the calculated SESR exceeds this value over the
measurement period (Report Time).
•
Background Block Error – this threshold which defaults to 6.25 X 10-2 triggers
an alarm if the calculated BBER exceeds this value over the measurement period
(Report Time).
6.7.2.2 Link Availability
A period of unavailable time begins at the onset of ten consecutive SES events.
These ten seconds are considered to be part of unavailable time. A new period of
available time begins at the onset of ten consecutive non-SES events. These ten
seconds are considered to be part of available time. The figure below illustrates this
definition.
Figure 7. Link Availabity
6.7.3 RF Link Error Monitor
The Link Error Monitor screen provides the user with detailed Packet Error Rate
(PER), G.826 and link availability monitoring for the RF link. There is a status field,
Total Seconds, which applies to the link. Total Seconds is the total number of
seconds since the counts were last cleared. It is used to determine available and
unavailable seconds on a link.
6.7.3.1 General
•
Errored Blocks Counter - containing the number of blocks containing errors
accumulated until cleared.
•
Errored Seconds Counter - containing the number of seconds containing
errored blocks since the counters were last cleared.