DESIGN AND CONSTRUCTION OF A TELEPHONE INCOMING CALL COUNTER
CHAPTER ONE
1.1 INTRODUCTION
Telephone incoming call counter provides information essential for survey, marketing and telephone traffic measurement purposes. It is an inexpensive, pocket sized instrument for counting the number of incoming calls to a telephone, PABX exchange line or extension. The unit maintains and displays separate totals for the overall number of incoming calls and the number that were answered. It eliminates cumbersome, time consuming and error prone pencil and paper recording methods. Telephone incoming call counter is quickly and easily installed in a few minutes by non technical people, and in most cases, without the use of any tools.
1.2 AIM OF THE PROJECT
The aim of this work is to design a device which is to be connected to the telephone lines to count and display the number of incoming calls received in the absence of the subscriber.
1.3 OBJECTIVE OF THE PROJECT
The objective of this work is the provision of a counter for outgoing calls and. another counter for incoming calls and of means for, advancing said counters one step each time the: telephone receiver is returned to its rest after the consummation of a call, additional means being provided whereby the counter of the incoming calls is also set back one step each time an outgoing call connection is established or tried to be established.
1.4 APPLICATIONS OF THE PROJECT
Telephone incoming call counter provides up to the minute incoming call information. At the push of a button it displays the latest call figures, such as those to a telephone whose number is uniquely quoted in an advertisement. The volume of calls to such a number is a direct and accurate indication of the response to the advertisement.
The choice of format and medium (eg Yellow Pages, newspapers, direct mail etc.) for an advertisement or advertising campaign can be critical to its success and Telephone incoming call counter can be the ideal partner in the survey process. Incoming telephone traffic monitoring and analysis. Telephone incoming call counter has a time based call accumulating feature unique among such low cost instruments that makes it a truly useful traffic measurement and statistical tool.
The feature accumulates total incoming and answered calls in 24 separate displayable one hour slots. This provides not only the totals of answered and unanswered calls but also the volume within each of 24 one hourly slots, forming an accurate statistical picture of their cumulative distribution over a complete day. A typical and common application is in determining the adequacy of telephone/switchboard attendance arrangements and general business hours. A large volume of unanswered calls will suggest that changes are needed. However, information on when they occur is essential as a guide to meaningful modifications. Telephone incoming call counter’s ability to supply this information will ensure that changes made are appropriate and effective.
1.5 SCOPE OF THE PROJECT
The circuit presented here is a very useful add-on device to be connected to the telephone lines to count and display the number of incoming calls received in the absence of the subscriber.
The circuit can be fabricated using low-cost and easily available components. It uses a popular decade counter ic, a timer ic, and a few other discrete components.
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