Custom Operation; Table 3-9. Efd Closed Network Parameter Settings - Comtech EF Data SDM-300A Installation And Operation Manual

Operation
Parameter
Modem Type
TX Data/Code Rate
TX-IF Output
RX Data/Code Rate
TX Clock Source
Buffer Clock Source
Modulator Type
Encoder Type
Demodulator type
Decoder Type
TX Overhead Type
RX Overhead Type
Interface Type
Buffer Program
RTS TX-IF Cntrl
CTS Delay
Note: To use G.703, the modem must have the required G.703 Overhead board (PL/5305-1)
installed.
3.4.2.6

Custom Operation

Note: If the modem serves as the backup unit for a rack of modems having different
hardware and FAST options, then the backup modem shall have all of the features and
hardware found in the other modems.
Operating in Custom mode allows access to all front panels menus, including the Utility
menus. The Custom operation mode is manly used when the modem must function with
no overhead in an open network application. For example, to use the modem in the IDR
mode of operation with overhead (308-2), the following steps are taken:
1. Select the IDR modem type, so that the modem loads the IDR default parameter.
2. Select the Custom modem type, which allows Access to the modulator and
3. Select NONE for the overhead types.
A protection switch can make use of the Custom operation mode when the modem is
configured as a backup modem. Because the backup modem is operating in Custom
Mode, the switch can program all the backup modem parameters. Thus, the one backup
modem can be made compatible with all of the various application types found in the
rack.
3–82

Table 3-9. EFD Closed Network Parameter Settings

Front Panel Setting
EFD
TX-V, QPSK 1/2
ON
RX-V, QPSK 1/2
TX Terrestrial
Satellite Clock
EFD Closed (All modulator types are
accessible)
Viterbi or Sequential
EFD Closed (All modulator types are
accessible)
Viterbi or Sequential
None
None
EIA-422, EIA-232, V.35, G.703
Note)
Bits or Milliseconds
OFF or ON
0 Seconds
demodulator overhead type.
SDM-300A Satellite Modem
Reference Menu
Utility Modem Type
Configuration Modulator
Configuration Modulator
Configuration Demodulator
Configuration Interface
Configuration Interface
Utility Modulator
Utility Modulator
Utility Demodulator
Utility Demodulator
Utility Interface
Utility Interface
Utility Interface
(see
Utility Interface
Utility Interface
Utility Interface
Rev. 4