RAD Data comm IPmux-1 User Manual

Page 128

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 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

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

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