Metrodata FM4900, User Manual

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ANALYSING PERFORMANCE
37 76-02-011F
7 ANALYSING PERFORMANCE
7. 1 Introduction
The FM4900 provides you with extensive performance analysis functions, which allow you
to monitor and record service information about the E3 link.
The first part of this section describes the Errors and Alarms that are valid for the modes of
operation of the FM4900. Performance data is displayed in the form of an on-screen report
or summary. Information is grouped into periods of 15 minutes. Examples of the screens are
shown in later subsections.
7. 2 Errors and Alarms
7 . 2. 1 Error types
The following error types are reported:
Figure 7. 1 FM4900 Error types
7 . 2. 2 E3 Port Alarm responses
The default responses in Figure 7.2 below are established in the presence of an alarm
condition on the E3 port
. An alarm or alarms can be cancelled by selecting the ALARM
EXTENSION / CLEAR ALARM OUTPUTS option from the MAIN SET-UP menu. After the
alarm has been cancelled as above, it is still indicated on the front panel indicators and in
the performance statistics.
Figure 7. 2 E3 Port alarm default responses
Code Errors Indicate bipolar violations leading to HDB3 code errors.
In Unframed mode this is the only type of Error shown.
FAS Errors Frame Alignment Signal which indicates a fault in the frame
alignment pattern.
This measurement is only valid in G.751 framed mode.
Alarm Response
LOS MAJOR alarm lamp lights
CA cleared if THROUGH
E3 port transmits RAI if in framed mode.
LOF (Framed mode only) MAJOR alarm lamp lights
CA cleared if THROUGH
E3 port transmits RAI if in framed mode.
SQ (Framed mode only) MAJOR alarm lamp lights
CA cleared if THROUGH
E3 port transmits RAI if in framed mode.
AIS (Framed mode, or if AIS is
enabled in Unframed mode)
MINOR alarm lamp lights
CA cleared if THROUGH
E3 port transmits RAI if in framed mode.
RAI (Framed mode only) MINOR alarm lamp lights.