Comtech EF Data SDM-300L3 - Manual (Page 208)

SDM-300L3 Satellite Modem Revision 1
Modem Types MN/SDM300L3.IOM
5–8
5.7 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 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 demodulator
overhead type.
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.