Comtech EF Data SNM-1001L - Manual (Page 165)

SNM-1001L Satellite Modem Revision 1
Modem Types MN/SNM1001L.IOM
5–3
Table 5-2 . Comtech EFD Closed Network Parameter Settings
Parameter Front Panel Setting Reference Menu
Modem Type EFD Utility: Modem Type
TX Data/Code Rate TX-V, QPSK 1/2 Configuration: Modulator
TX-IF Output ON Configuration: Modulator
RX Data/Code Rate RX-V, QPSK 1/2 Configuration: Demodulator
TX Clock Source TX Terrestrial Configuration: Interface
Buffer Clock Source Satellite Clock Configuration: Interface
Modulator Type Comtech EF Data Closed (All
modulator types are accessible) Utility: Modulator
Encoder Type Viterbi or Sequential Utility : Modulator
Demodulator type Comtech EF Data Closed (All
modulator types are accessible) Utility: Demodulator
Decoder Type Viterbi or Sequential Utility: Demodulator
TX Overhead Type None Utility: Interface
RX Overhead Type None Utility: Interface
Interface Type EIA-422, EIA-232, V.35 Utility : Interface
Buffer Program Bits or Milliseconds Utility : Interface
RTS TX-IF Cntrl OFF or ON Utility: Interface
CTS Delay 0 Seconds Utility: Interface
5.2 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 mainly 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 (IESS308-2),
the following steps are taken:
1. Select the Custom modem type, which allows Access to the modulator and
demodulator overhead type.
2. 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.