Comtech EF Data SMS-458B - Manual (Page 49)

SMS-458B Modem Protection Switch Revision 2
Operation MN/SMS458B.IOM
3–13
3.4.3.6 Channel Unit Selection
Note: The default is Option 1, no channel unit.
This menu displays the current channel unit setting.
• Option 1 selects no channel unit
• Option 2 selects an external channel unit for the modem.
3.4.4 Modem Configuration
3.4.4.1 Prime and Backup Modem Configuration
The prime modems have all parameters properly configured for operation prior to
configuration loading or verifying. The only required parameters for a backup modem are
the data rate and code rate assignments in the modem’s utility menu.
To communicate with the modems, the switch must have the modem addresses entered
into the system configuration. The serial interface type, baud rate, and parity of the
switch modem control interface are fixed and therefore can not be programmed by the
user. For interface information, refer to Section 4.2.
The modems must be set to:
• EIA-485
interface
• 9600
BAUD
• Even
parity
Each modem in the switch system must have its own unique address. The interface type,
baud rate, parity, and addresses are selected on the M&C card in the modem (see the
modem installation and operation manual).