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Operation
3.2.3 Modem Configuration
3.2.3.1 Prime and Backup Modem Configuration
The operator must be sure that 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 is fixed, and therefore cannot be programmed by the
operator. For interface information, refer to Section 4.1.5.
The modems must be set to RS-485 interface, 9600 baud, and 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 appropriate
section of the modem installation and operation manual.)
3.2.3.2 Modem Configuration Menu
To load the modem configurations, press [F1] (LOAD) in the MODEM
CONFIGURATION menu, and proceed as follows:
1. To load the configuration of an individual prime or backup modem, use the [F1]
2. To load the configuration of all active modems, use the [F2] (ALL) menu. If [F2]
The switch displays "OK" or "ERROR", showing the result of the configuration loading
process. An "ERROR" response results in an M:N fault.
3–12
(SELECT) menu. If [F1] (SELECT) is pressed, the menu presents options of
PRIME (F1) and BACKUP (F2). After the selection of prime or backup, the last
menu will require entry of the prime or backup modem number. The switch
automatically loads the configuration of the modem selected.
(ALL) is pressed, the menu requires that [ENT] be pressed to begin the loading
of all active modem configurations.
SMS-758 Modem Protection Switch
MN/SMS758 Rev. 3
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