Assignment - Software Design for Telephone System

If you order your custom term paper from our custom writing service you will receive a perfectly written assignment on Assignment - Software Design for Telephone System. What we need from you is to provide us with your detailed paper instructions for our experienced writers to follow all of your specific writing requirements. Specify your order details, state the exact number of pages required and our custom writing professionals will deliver the best quality Assignment - Software Design for Telephone System paper right on time.

Our staff of freelance writers includes over 120 experts proficient in Assignment - Software Design for Telephone System, therefore you can rest assured that your assignment will be handled by only top rated specialists. Order your Assignment - Software Design for Telephone System paper at affordable prices with cheap essay writing service!

Assignment - Software Design for Telephone System

Assumptions -

· The software is designed for local calls only, it will serve the people living in that geographic area.

· This system does not support conference. Help with essay on Assignment - Software Design for Telephone System · The subscriber will not be allowed to make any calls if his account accumulates an outstanding bill of £500 or more.

· The system will start charging once the connection is successful, and not during connecting or unsuccessful call.

· The system will disconnect from the caller if the connecting sequence has reached a timeout period of 1min.

· There are voice recorded messages that can be played to the caller when there are certain errors encountered.

This software will be running at the local exchange to manage the connections and charge the subscribers for the service. This telephone switching system consists of mainly two components, the controlling software and the electronic switching circuitry. It controls and allows two users to connect to each other, as show on the DFD below.

When the caller picks up his phone, he actually closes the circuit and connects to the local exchange telephone network. The system will detect this and lookup the Telephone Directory for the particulars for this telephone line and the respective subscriber. If the system detects that it is a valid line with subscription it will send a dial tone signal to the phone. The caller hears the dial tone will then dials the number of the callee, the system receives the signal to connect to another telephone line. It will look up the Telephone Directory again to check for any outstanding amount unpaid by the subscriber, if its £500 or more, the caller will be barred from making any calls. If not the system will look up the Telephone Directory for the particulars of the callee. For this case, since it is the caller party pays, even if the callee has chalked up a bill of £500 or more, he can still be contacted, unless his phone line is down.

If there is such a number where the caller dials, and the system has looked up the Telephone Directory checking the status of the callee. It will check if the callee is currently online, if the callee is busy, the system will send a busy tone back to the caller, signaling a call made is unsuccessful. The transaction is thus ended. If the caller wishes to redial, he will have to hook up his phone first to disconnect from the network before dialing, the system will then restart the sequence once again.

If the callee is free, the system will send a signal or a high current to ring the callee's phone, at the same time, the system will send a ringing tone to the caller, telling him that the callee is not engaged and that he has to wait for the callee to pick up his phone

However, if the callee is unavailable; his phone line is not engaged but is not at home, the ringing signal will continue to sound for a period of 1 min or until the caller hangs up, whichever is earlier, the system will terminate the call and end the transaction.

If the callee is free and available, and once he picks up the phone, his phone too will be connected to the telephone network, the system senses this and connects the caller to the callee.

The system will activate the timer once the connection is successful, and base on the current pricing plans, the system will calculate the duration of the call and charges to the caller's account, until either party ends the call. The system will also updates the subscriber's account when he makes payment.

On the occasion when the phone number dialed by the caller is invalid, the system will playback a prerecorded voice messages telling him that there is no such number or that the number has been terminated.

The DFDs below will show a more detail process in each stage of a call and their process specification.

Please note that this sample paper on Assignment - Software Design for Telephone System is for your review only. In order to eliminate any of the plagiarism issues, it is highly recommended that you do not use it for you own writing purposes. In case you experience difficulties with writing a well structured and accurately composed paper on Assignment - Software Design for Telephone System, we are here to assist you. Your cheap custom college paper on Assignment - Software Design for Telephone System will be written from scratch, so you do not have to worry about its originality.

Order your authentic assignment from cheap essay writing service and you will be amazed at how easy it is to complete a quality custom paper within the shortest time possible!