contain the number of 4 second intervals with
< 10 : less than 10 bit errors recorded 10-32 : between 10 and 32 bit errors recorded 33-36 : between 33 and 36 bit errors recorded > 36 : more than 36 bit errors recorded
HDB3-x Time (sec/min) in which HDB3 code violation exceeds 10-x
Call processing control by PCM faults:
Number of port blocking events
Number of connection releasing events
Number of slips:
In non synchronized networks it may happen that a DIU has to skip (or read twice) an incoming pulse frame because the clock on the PDC is higher (or lower) than the internal clock of the switch. This process of skipping (or duplicating a pulse frame) is known as a „slip“.