Wegener DR95 Instruction Manual page 35

3.3.4 Margin
The yellow MARGIN LED is a warning that the input signal-to-noise ratio of the carrier being
tracked is below a pre-set level stored in non-volatile memory. This level is generally set to be
just above audio threshold (by a few dB), so its indication signifies a marginal link.
3.3.5 Service (Mute) LED's
The red SERVICE 1 and SERVICE 2 LED's are lit whenever the audio at either of the two audio
outputs (respectively) are muted. This muting usually occurs because the receiver is not tracking
a valid, authorized carrier, and thus there is no audio available. If tracking an authorized carrier
with poor input signal quality, both LED's light to indicate squelching of the audio. Poor signal
quality is defined as an excessive error count detected by the demodulator FEC decoder, or loss
of frame-sync by the MPEG audio decoder. Otherwise, a mute command for a specific channel
will mute that channel and turn on its SERVICE LED.
3.3.6 Channel (Optional)
Some receivers contain a seven-segment display located on the front panel. The display indicates
which search table entry the receiver is tuned to. The display will show a number between one
and nine, a letter between A and F, or a "–". The numbers are equal to the first nine entry
locations (1–9) in the search table, the letters A through F are equal to the next six entry locations
(10–15) in the search table, and a "–" will be shown when the receiver is tuned to frequency that
is not in the search table or when the receiver is in a search mode.
3.4 RECEIVER CONTROL AND REPORTING
There are several methods of controlling a DR95-1X/DR96-1X receiver, varying on the degree of
flexibility and feedback desired. Receiver functions may be controlled from a network through
the signal channel (see paragraph 3.4.3), a local dumb terminal (see paragraph 3.4.1), and a
remote terminal via phone-modem (see paragraph 3.4.2). Simple frequency control is also
possible using the rear-panel DIP switches (see paragraph 3.4.5). Lastly, it is also possible to
mimic network control using a local computer (or remote through a modem, see paragraph
3.4.6). This computer must be loaded with software similar to that installed at network uplinks,
with command packet protocols conforming to Wegener's proprietary ANCS standard.
There are three methods of getting status reports from the DR95-1X/DR96-1X receiver. Upon
request with a dumb terminal, status can be reported back to the terminal per paragraph 3.4.1.
Similarly, this terminal may be connected via a phone-modem per paragraph 3.4.2. If
commanded through a network, the receiver can dump these status reports and additionally, may
route arbitrary E-mail files to a serial printer (see paragraph 3.4.4).
3.4.1 Terminal Control & Reporting
This paragraph discussed using a dumb ASCII terminal (or PC running a terminal emulation
program) to control and get reports from the receiver. Set up to use this mode by referencing
paragraph 2.3.4, Control/Monitoring Connections. The allowed commands may be divided into
those that modify receiver status, those that request reports on that status, and the help
commands. Modifying commands include requests to change permanent frequency, set the audio
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