RAD Data comm TDMoIP Gateway IPmux-16 - Manual (Page 72)

Chapter 3 Operation IPmux-16 Installation and Operation Manual
3-40 Configuring IPmux-16
Table 3-3. E1/T1 Alarms and Statistics
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 below) 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, 0.161, G.775 and G.821 standards.
Rcv RAI
(Yellow
Alarm) Remote
Alarm
Indication The Sync LED flashes.
•
For E1/T1, a second during which an 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
The 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.