PSM-500/500L/500LT SCPC Satellite Modem
Operation
PSM-500/500L/500LT - Rev. 0.91
Page 3-7
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.
Selection entries may be accomplished by one of the following:
•
When a selection entry 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 place the new setting into the nonvolatile EEPROM
making it available not only immediately, but also automatically the next time the unit is powered
on.
3.1.3.4 Automatic Modem Parameter Sequences
Certain parameters are dependent on other parameter settings. New in the PSM-500 is
automatic presentation of 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” type, then the “Data Code Rate” finally
returning to the original IF Modulation screen. If only the Data FEC type 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.
3.1.3.5 Finding Modem Parameter Limits
During parameter setting you may not know what the maximum or minimum value is that may be
entered. 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 possible. For example, when all other
parameters have been set, if you wish to go to the maximum transmit data rate possible in an
M505 modem simply enter a value like 10000 (for 10,000 kbps). The modem should beep, say
“Set at max” and enter a value of 5000 (for 5 Mbps).
3.2 Front Panel Monitor and Control Parameters
The following tables 3-1 through 3-4 list the parameter matrices available from the front panel.
Parameters that appear shaded are only accessible when the modem is configured to use those
parameters. For example, those parameters pertaining the to AUPC are only available when the
AUPC is enabled, and those pertaining to the Reed-Solomon Codec will appear only if the Reed-
Solomon Codec is installed and enabled. This list does not include optional parameters for some
interface options such as Ethernet or G.703 E1 interfaces.
