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consequence a number of different emergency mass alerting means have been promoted and a large number of misconceptions have appeared and poor systems installed through hurried implementation projects.
The varied solutions promoted fall roughly into two camps. Firstly there are the text based, individually addressed, pre-subscribed type systems that empower individuals to enrol for the receipt of text messages sent to cellular phones and additional wireless email or messaging devices. Secondly, there are the broad area, public notification type systems that dispense text or voice messages, or activate non-specific audible warning devices [link widoczny dla zalogowanych], that are scatter approximately the public areas of a campus or in areas where large numbers of folk congregate such as lecture auditoriums, schoolrooms, cafeteria’s etc. In appending to the above, there are some calculator network based systems that send messages to calculator screens throughout a campus network by email or shade pop-up.
Each of the above systems has its pros and cons [link widoczny dla zalogowanych], however it is my opinion that reliance on the individually addressed, SMS or text message based system as the basic, and periodically only, means of alert is risky. These systems and their proponents are engendering a artificial sense of security and making promises about their effect that are condemned to guide to misadventure if these systems are implemented as the sole and primary source of emergency alerts.
Cellular based text messaging systems are not real time and are essentially one to one communications systems which makes them too slow and unreliable for the allocation of emergency messages in a timely and serviceable manner to a large number of recipients in a small area. Because the originator of a text information is not communicating instantly with the receiver of the information yet namely sending the message into a network, unsupervised along the originator, which manages the delivery based above unknown criteria and system priorities, it tin take from several minutes to several hours or even days to send a unattached message to a large number of recipients.
One message sent to 1,000 recipients, case in point, requires 1,000 individual transmissions to be administered by the network. Whilst quite large numbers of text messages are sent daily to phones throughout the world and to a decisive extent arrive reasonably presently after having been initiated, cellular based SMS/Text systems rely on the recipients of that message traffic creature geographically dispersed. When messages are generated to be sent to a large number of recipients in a relatively small geographical area, such as on a university campus, It is highly unlikely that the network capacity, even when spread along a number of carriers, would be ample to deliver those messages quickly enough for the information to be deeded on in a timely manner or for the system to be regarded as a authentic means of vigilant.
Tests of such systems namely have been carried out on campuses have shown namely it can take up to several hours for a single message to be conveyed to always subscribers and the testing that has been carried out has been done below ideal conditions. In a test scenario, because there is not actual emergency, the message does not generate the escalation of respondent vehicle that a real emergency message would which would beyond clash on network congestion.
Apart from network capacity issues with respect to the initial message transportation, once emergency messages start to arrive on phones, the networks will immediately convert saturated with texts and voice calls initiated by the subscribers calling friends and kin. The networks are likely to, and have, in a number of such emergency situations, crashed under the volume of traffic [link widoczny dla zalogowanych]!
At any an time a colossal digit of calls in a university surroundings are too possible to be switched off or diverted apt discourage disturbance in speeches and this exacerbates the congestion problem for networks attempt to automatically resend unacknowledged messages.
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