Appendix E Configuration Menus IPmux-1/1E Installation and Operation Manual
E-42 Performance Monitoring
Table E-27. E1/T1 Statistics Parameters Alarm Failure Comments
LOS Loss of Signal Sync LED Off
• For T1: A second during which 192 contiguous pulse positions have no
pulse of either positive or negative polarity (signal is more than 30 dB
below nominal amplitude
• For E1: A second during which 255 contiguous pulse positions have no
pulse of either positive or negative polarity
LOF Loss of Frame Sync LED Off
• For E1/T1: A second during which an OOF error persists for 2.5 seconds
and no AIS error (see below) is detected
LCV Line Code
Violation
Line Code Violation
• For T1: A second during which BPV (Bipolar Violation) or EXZ errors have
occurred
• For E1: A second during which two consecutive BPVs of the same polarity
are received
BPV is the occurrence of a pulse with the same polarity as the previous
pulse.
EXZ is the occurrence of a zero string greater than 15 for AMI or 7 for B8ZS.
Complies with ITU-TI.431, O.161, G.775 and G.821 standards.
Rcv RAI
(Yellow
Alarm)
Remote
Alarm
Indication
Sync LED flashes
• For E1/T1, a second during which tan RAI pattern is received from the far
end when the far-end framer enters a RED state (Loss of Frame)
AIS Alarm
Indication
Signal–
Received
from User
Sync LED is Off
• For T1: A second during which an unframed “all 1” signal is received for
3 milliseconds
• For E1: A second during which a string of 512 bits contains fewer than
three zero (0) bits
FEBE Far End Block
Error
Number of seconds in which the FEBE indication is received from the remote
E1 device
(For E1 MF-CRC4 only)
BES Bursty Errored
Seconds
(Errored
Second
Type B)
Number of seconds with from two to 319 CRC error events with no AIS nor
SEF (Framing Bit Errors) error detection
Complies with AT&T TR-62411 and TR-54016 standards
Not applicable if Line Type is set to Unframed
(T1-ESF or E1-CRC4 modes)