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Section 5, Statistics MX2800 M13 Multiplexer User Manual
DS3 Statistics
The DS3 Statistics menu, see Figure 5-2, provides submenus for alarm history and performance parame-
ters.
Figure 5-2. DS3 Statistics Menu
24 Hour Alarm History
The MX2800 keeps track of alarms for both the near and far ends of the network. View alarm history infor-
mation in one of the three time period selections, or view a cumulative alarm count. Information in these
fields is for the given time period since the last reset. The cumulative alarm count continues indefinitely
until Clear All DS3 Alarm Counts is selected. See Table 5-1 for a list of alarm counts. See Figure 5-3 on
page 5-3 and Figure 5-4 on page 5-4 for examples of alarm screens.
Table 5-1. Alarm Counts
Condition Description
LOS Number of times the unit has lost the receive signal.
LOF Number of times the unit has detected a loss of framing from the network.
AIS Number of times the unit has received an AIS (blue) alarm condition from the net-
work. AIS alarms occur when consecutive 1010s are received in the information
bits. This indicates that there is a transmission fault located either at or upstream
from the transmitting terminal.
RAI Number of times the unit has received an RAI (yellow) alarm from the network.
This alarm is a signal sent back toward the source of a failed transmit circuit. The
X-bits (X1 and X2) are set to zero.