
Coral IPx Office Installation Manual
Shared Service Cards
9-61
Remote Maintenance (Modem
)
9
9.11
Remote Maintenance (Modem)
0
The
U-RMI Office
and
RMI Office
cards provide an auto-answer data modem. A full
duplex, asynchronous, ASCII modem, used for remote programming of the system
database, diagnostics and system maintenance, and/or for displaying various reports.
The modem operates at up to 56Kbps, using the ITU-T V.92 standard.
The modem answers an incoming call in Originate mode (no answer tone). To
establish a connection, the originating modem must initiate the call in answer mode
(by sending answer tone). This feature may be used as an added security measure to
protect the system database from intrusions.
0
The
U-RMI Office
and
RMI Office
cards are equipped with jumper straps P5 and P6
(see
) that enable and disable the modem. These jumpers,
when removed, disable the on-board modem, without affecting the other programming
interfaces. Thus, a local programming terminal or an external modem incorporating
more sophisticated security features may be operated while the modem is disabled.
The modem requires no external connections to function. The data side of the modem
circuitry directly accesses the peripheral data bus to communicate with the system
processor. The audio side of the modem circuitry directly accesses the switching
matrix, is assigned a dial number in the system database and may answer incoming
calls in virtually the same manner as any other port in the system.
The modem can be configured to transmit or receive data. This is useful when
maintenance from a remote workstation is necessary. During normal system
operation, it is advisable to set the modem transmit and receive function to “Off” for
more secure system operation.
displays the jumper settings for the
modem.
...................................................................................................
1
General Description
...................................................................................................
2
Modem Jumpers - Enable/Disable
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