CompactPCI and AdvancedTCA Systems - OpenSystems Media

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RSC# 28 @www.compactpci-systems.com/rsc 28 / CompactPCI and AdvancedTCA Systems / September 2005
T E C H N O L O G Y I N T E R N E T M O D E M S additional features such as unattended operation and the sending of prestored messages independent of the host intelligence and control. Each iModem is self-contained and imbued with ability to both send and receive e-mails and their associated Internet protocols with little or no external control. The resident intelligence of the iModem facilitates this. (See Figure 2.) It allows for: Figure 2 ■ Nonvolatile storage of a precomposed message ■ The required local telephone numbers ■ Resident destination e-mail address ■ Password and other characteristics A prestored message can be sent on a contact closure or by a simple software command. The prestored message can also be dynamically changed and recomposed. The message can be of unlimited length and sent in increments. The iModem operation occurs independent of the host microprocessor. Traffic management If each element of a large traditional modem network must report in daily at about the same time, this can cause a large demand for central site resident bandwidth in the form of large hardware capacity, including modems and telephone lines. The possibility of traffic jams and coincidence collisions may still exist. The solution is to have the elements report in at staggered times, which works well if the data can be gathered over a longer period of time. With the Internet-based messaging, all field products can send their daily e-mails at about the same time, and they will be delivered as website updates or as e-mail to one or more e-mail mailbox locations within a reasonable period of the desired time of day. The iModems benefit from the distributed local access numbers and local modem capacity, as well as from the Internet’s large bandwidth. Polling large numbers of field-installed products Users often must poll a large number of field devices for the purpose of updating software or retrieving accumulated data. RSC# 29 @www.compactpci-systems.com/rsc CompactPCI and AdvancedTCA Systems / September 2005 / 29
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