Appendix E Parameters and Screens IPmux-1/1E Installation and Operation Manual
E-30 Performance Monitoring
Table E-21. 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 (see b elow) 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 t wo 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, 0.161, 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 patter n 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 unframe d “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
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