08:39:57
>LINK UP
STU-C E1<
MODEM STATUS
ET: 000:05:54
LINE RATE
:1544 kbps
PAYLOAD RATE:1536 kbps
STU-C STU-R
CUR SNR MARGIN: 18 dB 16 dB
ATTENUATION : 1 dB 1 dB
STORE
RESET RETRAIN
2.3.1 Modem Status
Use these screens to view realtime link parameters. Press
to view the available screens
08:39:57
>LINK UP
STU-C E1<
MODEM STATUS
ET: 000:05:54
RETRAINS: 0
STU-C STU-R
MAX SNR MARGIN : 19 dB 18 dB
MIN SNR MARGIN : 16 dB 13 dB
CRC ERRORS : N/A 0
ERROR SEC
: N/A
0
SEVERE ERR SEC : N/A
0
UNAVAILABLE SEC: N/A
0
LOSW SEC
: N/A
0
STORE
RESET RETRAIN
Figure 30 STUx E1 Modem Status Screens
Modem Status screens provide general performance information
on the STU-C and STU-R. For the far end data, “N/A” is displayed.
The following is reported:
ET
: Elapsed Time since RESET (F3), RETRAIN (F4), or ESC was
pressed.
LINE RATE
reported in kbps, see
Section 2.2-Notes for Payload
and Line Rates
.
PAYLOAD RATE
reported in kbps, see
Section 2.2-Notes for
Payload and Line Rates
.
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
: 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. 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 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.
MTT-14B e_Manual D07-00-083P RevA00
Page 51 of 101
