MDS 05-3628A01, Rev. B
MDS 4790M (MPT 1411) I/O Guide
41
SNR, SNR!
These commands display the signal-to-noise ratio in dB. GE MDS’ definition
of signal-to-noise is based upon the signal level following equalization, for
valid frames only. A valid frame is defined as containing no more than one bit
error, and belonging to a packet addressed for the receiving radio. SNR is
updated and latched for each valid packet received. A filter in the DSP tempers
the effect of any sudden changes in the value.
Output ranges from 10 dB to 33 dB. A value of 10 dB represents little or no
signal. A value of 24 dB represents a very strong signal.
The
SNR
command causes the diagnostic port to enter an SNR update mode.
The diagnostic port will display an updated SNR output line at roughly a 2
second interval refresh rate. The diagnostic port will stay in this mode until the
Enter key is pressed at the PC.
The
SNR!
command is a “computer friendly” version of
SNR
. It provides a
one-time reading and display of SNR at the diagnostic port.
SREV
SREV
displays the software release number, revision and build date:
STAT
The
STAT
command provides a user-friendly, interactive way to get alarm
status. (The
ALARM
command (page 28) summarizes alarm codes in
hexadecimal format.)
If no alarm event conditions are active, the message
NO ALARMS PRESENT
is
displayed. If alarms are present, they are displayed in ascending order starting
with the lowest event number:
Command Input
Response
SHOW DC
DC IN xx.x V
DC OUT x.x V
SHOW PWR
RF POWER xx dBm
SHOW CURRENT
LNA xxx mA
TOTAL xxx mA
SHOW RADIO
B RADIO IS ACTIVE
A RADIO IS [INACTIVE|NOT EQUIPPED]
06-3321A01
1.0.0
ddmmmyyyy
Event: 26 (MINOR)
DC input power is not in
valid range
S/N Ratio screen, page 61
Software Revision screen,
page 62
Active Radio Status screen,
page 61
