Severely Errored Seconds (SES #)
- An Errored Second is any second containing one or more CRC anomaly, or one
or more Los(s) or Severely Errored Frame (Sef) defect(s).
Unavailable Seconds (UAS #)
- a count of 1-second intervals for which the xDSL line is unavailable. The xDSL line
becomes unavailable at the onset of 10 contiguous SES which are included in unavailable time. Once unavailable, the xDSL
line becomes available at the onset of 10 contiguous seconds with no SES however these 10 seconds with no SES are
excluded from unavailable time.
Loss of Signal Second (LOSS #)
- This parameter is a count of 1-second intervals containing one or more LOS
defects.
Channel Performance monitoring definitions:
HEC Up and Down Stream (#)
- Count of near-end Header Error Control anomalies for the interleaved or fast data
streams. A CRC algorithm is used for checking and correcting an error in the ATM cell header. ATM equipment checks for
an error and if possible will correct it.
CRC Up and Down Stream (#) -
Received CRC-8 code word received does not match the code word transmitted. A
count of the superframes that contained CRC
LCD Up and Down Stream (#)
- Count of near-end Loss of Cell Delineations for the interleaved or fast data streams. A
LCD failure is reported if this counter has surpassed 127. An LCD state is declared after an OCD condition persists for 4
milliseconds. An OCD event is declared when seven consecutive ATM cells have Header Error Control (HEC) violations.
# of Sync
- Number of times the modem has spontaneously retrained
Note:
Alarms and Errors detected will trigger the Alarm/Error LED. To reset the LED, press the reset key on the
keypad
Events
tab: Provides a time stamped record of all events that occur for the duration of the test.
BX100A/V Events Log Function
BX100A/V Measurement Action Menu
Event types include Link Down, Training, Discovery, Handshake, Lost Frame, Bit Error, Showtime, FEC Error, Local CRC Error,
LCD Error.
Note:
The Events function provides a time stamp of link status, alarms and error conditions.
The Events function can only be reset by closing or performing a retrain on the link under test.
BX100A/V e-Manual D07-00-001 Rev E01
Page 28 of 52
