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RuggedRouter® User Guide
T1/E1 Statistics
When at least one logical interface is configured, T1/E1 Link and logical interface
statistics will be available. These statistics are available from links on the T1/E1
WAN Interfaces menu.
Link Statistics are provided through the “View Link Statistics” link at the bottom of
each interface table. Frame Relay and PPP statistics are available through
“(Statistics)” links under the interface name column of each interface table.
Link Statistics
Figure 61: T1/E1 Link Statistics
The Link Alarms indicate ongoing problems.
ALOS/LOS (Loss of Signal) – This alarm indicates a complete absence of
synchronization pulses on the line.
RED (Red Alarm) - This is a local equipment alarm. It indicates that the incoming
signal has been corrupted for a number of seconds. This equipment will then begin
sending a yellow alarm as its outbound signal.
AIS (Alarm Indication Signal, or BLUE alarm) - This alarm indicates the total
absence of incoming signal as a series of continuous transitions (an all 1's pattern) is
received.
YEL (Yellow Alarm) – This alarm is transmitted to the network and alerts it that a
failure has been detected.
OOF (Out of Frame) – This alarm signifies the occurrence of a particular density of
framing error events. This alarm could signify that the wrong framing mode is
configured.
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