Demodulator Rate; Demodulator Filter Rate Assignment - Comtech EF Data SDM-650B Installation And Operation Manual

SDM-650B Satellite Modem
B.1.3.8 Demodulator Rate
The demodulator has four symbol rate filters. Each filter is for a specific symbol rate. The
data rate and decoder rate for each filter must be established upon initial demodulator
installation, and when circumstances indicate the need to do so.
Filters are designated as A, B, C, and D. If a filter is not physically present in the system,
it may be assigned "N/A" (not assigned).
Additionally, filters which are factory programmed may not be remotely programmed,
and will return the "error 5" message when a programming command is issued.
Notes: For variable rate demodulator option:
1. Demodulators with the variable rate option installed may have four
2. Modems that have the variable rate option installed will also respond to the
B.1.3.8.1 Demodulator Filter Rate Assignment
Command:
Response:
Status Only: <add/ADRx_"cr"
Response:
Note: The parameters "nnn_mmmm.m" may be replaced by "N/A" to indicate "no
assignment."
Example:
Command:
Response:
Rev. 6
preprogrammed rates available by using the filter rate assignment commands.
These rates are selected using the standard "SDRx_" commands.
special "SDRV_" command. This allows for truly variable rate control, while
maintaining compatibility with previous systems.
<add/ADRx_nnn_mmmm.m"cr"
>add/ADRx_nnn_mmmm.m"cr""lf"]
>add/ADRx_nnn_mmmm.m"cr""lf"]
Where:
x = A, B, C, or D (Filter designator).
nnn = 1/2, 3/4, 7/8, or BP12 (Decoder rate).
mmmm.m = 9.6 to 4080.0 (Data rate).
<add/ADRx_N/A"cr"
>add/ADRx_N/A"cr""lf"]
Remote Control Operation
B–9