M7/M7L/M7LT Modular Satellite Modem
Maintenance
M7/M7L/M7LT - Rev. 0.05
3-5
completely overwrites the existing parameter. For example when viewing the Modulator Data Bit
Rate of 256.000kbps entering the digits 64.000 (including the d
ecimal point) and pressing “Enter”
will change to that new 64kbps
data rate. Note that a leading “0” did not have to be entered to
overwrite the “2” of the existing parameter.
The current input can be canceled by pressing the “Clear” key at any time before pressing “Enter”.
Failure to press a key for approximately 60 seconds results in automatic canceling of the current entry
and return of the display to the current setting.
3.3.3.2.
Selection entries may be accomplished by one of the following:
When a selection en
try parameter is displayed, simply press the “Edit” key followed by a digit key
0, 1, 2, 3 or 4. In this scheme “0” represents disabled, OFF, NO or the first possible choice. “1”
represents enabled, ON, YES or the second possible choice. “2”, “3” and “4” represents the third,
fourth and fifth possible choices. Then press the “Enter” key to finalize the entry.
Alternately, when a selection parameter is displayed it can be changed by pressing the “Edit” key,
then using the up and down arrow keys to scroll through the possible choices. When the desired
option is displayed, pressing the “Enter” key selects the displayed choice and finalizes the entry.
When scrolling though the available options, an arrow in the left column position denotes the
current setting.
Direct entry can be accomplished if the
<Unit: Keyboard
– Entry Mode>
is set to “Quick”. In this
mode the current parameter can be changed by simply entering digit key 0, 1, 2, 3 or 4 … and
pressing “Enter” to finalize the entry. Optional selections can be viewed by successively pressing
several keys to determine their value, then pressing “Enter”.
Following a valid input, the modem will store the new parameter into nonvolatile memory.
3.3.4.
Automatic Modem Parameter Sequences
Certain parameters are dependent on other parameter settings. The M7 will automatically present
those parameters that must be set to properly achieve the first setting entered. An example of this is
when entering an “IF Modulation” mode change, the modem will accept that but next request entry of
the “Data FEC Mode”, then the “Data FEC Code Rate” finally returning to the original IF Modulation
screen. If only the Data FEC Mode were initially changed then only the following item in the sequence
would be requested. This insures that all of the necessary parameters are entered to enable any
mode dependent on other settings. Normal settings are typically displayed during this sequence and it
may be possible to simply press the “Enter” key at each succeeding request.
3.3.5.
Finding Modem Parameter Limits
During parameter entry, the maximum or minimum value may not be known. The modem can help in
some cases by taking the parameter to its maximum or minimum value when you enter a value
greater or less than what is possible. For example, when all other parameters have been set, to
configure the maximum transmit data rate possible in the modem, simply enter a value like 10000 (for
10,000 kbps). The modem should beep, display
“Set at max” and enter a value of 5000 (for 5 Mbps).
