7
Section 61180405L1-5, Issue 1
61180405L1-5A
5. OPERATION
For abbreviations used in the screen diagrams, see
Table 4
.
Table 4. Definition of Screen Abbreviations
Abbreviation
ES ....................
SES ..................
UAS .................
SF .....................
ESF ..................
B8ZS ................
AMI .................
LBO .................
BPV .................
NIU ..................
S/N ...................
15M .................
24H ..................
Definition
Errored Seconds: A count of the number of seconds in which at least one code violation was detected on a digital circuit
DS1 (SF)............... Second in which a BPV or frame bit error occurs
DS1 (ESF)............ Second in which a BPV or CRC error occurs
DSL ...................... Second in which a CRC error occurs
Severely Errored Seconds
DS1 (SF)............... Second in which 1554 BPVs or 8 frame bit errors occur
DS1 (ESF)............ Second in which 1544 BPVs or 320 CRC errors occur
DSL ...................... Second in which 165 CRC errors occur
Unavailable Seconds: A count of the number of seconds that a circuit or path is not available.
DS1 ....................... Second in which there is a loss of signal or frame sync
DSL ...................... Second in which there is a loss of signal or sync
Superframe Format
Extended Superframe Format
Bipolar with 8-Zero Substitution
Alternate Mark Inversion
Line Build Out
Bipolar Violation
DS1 ....................... Second in which a bipolar violation occurs
T1 Network Interface Unit
Serial Number
Fifteen-minute period
Twenty-four-hour period
