Comtech EF Data SMS-458B - Manual (Page 51)

SMS-458B Modem Protection Switch Revision 2
Operation MN/SMS458B.IOM
3–15
3.4.5 Operation Modes
The MODE menu selects the mode of operation. At power-up, the switch defaults to the
BYPASS mode unless both of the following conditions exist:
• It was in a different mode prior to loss of power.
• Battery-backed memory was maintained.
The following modes of operation are available:
BYPASS All switching is halted. No change will take place until the switch is
returned to the AUTO, LOCAL, or REMOTE mode.
AUTOMATIC The Monitor and Control controls all switching.
LOCAL The on-site user controls all switching.
REMOTE In the REMOTE mode, a remote controller via the remote interface
controls all switching. The on-site user cannot select this mode of
operation.
3.4.5.1 Bypass Mode
The BYPASS mode is recommended for initial and subsequent configuration functions. It
is the default-operating mode at power-up if the switch was not programmed for a
different mode prior to loss of power or if the battery-backed memory was not
maintained. The switch is not capable of performing any switching functions in the
BYPASS mode. All configuration and communication functions continue to operate, but
no new backup operation can take place. Any backup operation performed prior to
selecting BYPASS will remain in effect.
To enter the BYPASS mode, proceed as follows:
• Press [3] and [ENT] while in the MODE menu.
3.4.5.2 Auto Mode
The AUTO mode is the normal operating mode for the switch. Refer to the flowcharts in
Figure 3-3 and Figure 3-4. If the switch was in this mode when power loss occurred, it
will return to this mode when power is restored (all previous backup status will be lost).
If there are faults present when power is restored, the switch will backup the highest
priority faulted modulator and/or demodulator accordingly. Because the switch is
communicating with the prime and backup modems in this mode, response to keypad
input and remote communication may be delayed.
To enter the AUTO mode, proceed as follows:
• Press [1] and [ENT] while in the MODE menu.