Losw Sec - VeEX MTT-14B User Manual

MTT-14B e_Manual D07-00-083P RevA00 Page 11 of 101
CUR SNR MARGIN: Current signal-to-noise margin (in dB) is
the maximum dB increase in equalized noise or the maximum
dB decrease in equalized signal that a system can tolerate and
maintain a BER of 10 -7 .
ATTENUATION: This displays the loop attenuation (in dB).
MAX SNR MARGIN: Maximum signal-to-noise margin (in dB)
measured during ET. When either RETRAIN (F4) or ESC is
pressed, MAX SNR is reset.
MIN SNR MARGIN: Minimum signal-to-noise margin (in dB)
that is measured during ET. When either RETRAIN (F4) or ESC
is pressed, MIN SNR is reset.
CRC ERRORS: Count of CRC errors and is reset when ET is
reset.
ERROR SEC: Count of 1 second intervals during which one or
more CRC errors are declared and/or one or more LOSW defects
are declared. Reset when ET is reset.
SEVERE ERR SEC: Count of 1 second intervals during which at
least 50 CRC errors are declared or 1 or more LOSW defects are
declared. 50 CRC errors during a 1 second interval is equivalent
to a 30% error frame rate for a normal frame length. Reset when
ET is reset.
UNAVAILABLE SEC: Count of 1 second intervals for which the
SHDSL line is unavailable. The SHDSL line becomes unavailable
at the onset of 10 contiguous SESs. The 10 SESs are included in
the unavailable time. Once unavailable, the SHDSL line becomes
available at the onset of 10 contiguous seconds with no SESs.
The 10 seconds with no SES are excluded from unavailable time.
Reset when ET is reset.
LOSW SEC: Loss of synchronization word second is a count
of 1 second intervals during which one or more SHDSL LOSW
defects are declared. Reset when ET is reset.
The following F-keys are common to these screens:
PRINT (F1): Send the status screens to the serial port.
STORE (F2): Press to store the status screen.
RESTART (F3): Restarts polling and resets ET to zero.
RETRAIN (F4): Retrains the modem and resets ET to zero.