NMX920 OEM Integrators Guide
Page 15 of 21
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F KF7. Power Supply voltage above safe operating limits. No transmission
possible (and also receive unable to complete), but MASC port still active.
−
F KFB. Power Supply voltage below specified operating limits. No
transmission possible (and also receive unable to complete), but MASC
port still active.
−
F KFB followed by F O. Power Supply voltage so far below specified
operating limits that the entire modem shuts down.
−
F K F1. Modem’s power supply has been returned to nominal voltage.
The following diagram outlines the relationship between the voltage monitoring
states, the mechanisms for changing between them, and the MASC traffic
generated.
PWR
High
Normal
Mode
PWR > 7.5 V
PWR < 7.5 V
Periodic
MASC
F KF7
MASC
F KF1
PWR
Low
PWR < 6.5 V
Periodic
MASC
F KFB
PWR > 6.5 V
PWR < 5.5 V
MASC
F O
Shut
Down
7.4. Operational Notes.
−
In the case of abrupt power outage, the modem does not save buffered
messages. It does, however, preserve all system parameters allowing the
modem to return to the network contact once power has been restored
−
The NMX920 fully complies with the BellSouth Wireless Data requirements
for network delivered Lethal Injection. If the NMX920 is operating on the
BellSouth network, receipt of a Lethal Injection will render the modem
inoperable, requiring reactivation at a service centre or factory. Changing
networks (F R or F 03) does not reset this condition
−
MASC frames exceeding 1150 bytes are ignored by the modem
