Comtech EF Data CDM-550T Manual page 147

CDM-550T Satellite Modem
Selecting Async Mode
Access to this mode is not via the normal front panel menus or remote control. Customers
wishing to order modems from the factory may request that their units be pre-configured to
operate in this mode when they are shipped. Users who have existing units, and that have
Software Version 1.19 installed, may select Transparent Async mode from the FACTORY,
SPECIALS menu. The FACTORY sub-menus contain features and operating modes that may
be specific to particular customers of Comtech EF Data, and includes diagnostic modes that may,
in certain circumstances, render the modem inoperable. It is our policy, therefore to require a
special combination of keystrokes for FACTORY access, which we do not publish. Therefore, if
a customer wishes to select this mode, Customer Service should be contacted, who will then
provide instructions on how to enter the FACTORY sub-menus.
Once the feature has been enabled, the user should select CONFIG, FRAME, select FRAMED,
then press ENTER. The sub-menu that is then displayed will show the currently selected baud
rate. The baud rate can then be modified using the UP/DOWN arrow keys, then pressing
ENTER. When the sub-menu is first entered it will default to the highest possible baud rate,
based on the current modulation, FEC type, and data rate. If these parameters are changed, such
that the modem can no longer support the selected baud rate, the baudrate will be automatically
modified to the highest possible value.
To disable the async mode, select CONFIG, FRAME, select TRANSPARENT, then press
ENTER.
Rev. 1.3
Async Overhead Option
C–3