User manual

Chapter 5. Statistics
61185001L1-1 MX2810 M13 User Manual 5-3
The following alarm counts are provided in this menu:
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 network. 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.
IDLE Number of times the unit has detected an idle
sequence from the network.
The count given reflects the number of times the alarm or state has occurred
(rather than the number of seconds the alarm was active).