Tadiran Telecom Coral IPx 500, Installation Manual

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9-46
Coral IPx 500 Installation Manual
Rem
o
te Mai
n
ten
ance Modem
9
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The MSBipx card is equipped with jumper straps JU10 and JU11 (see
Figure 9-1
) 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 MSBipx 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 Coral IPx 500 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.
Figure 9-7
displays the jumper settings for the modem.
2 Modem Jumpers - Enable/Disable
Setting the Transmit or Receive function of the modem to “On” during normal system
operation exposes the Coral IPx 500 system to penetration by unauthorized parties.