Development of a telephone calls charge system

Τίτλος

Development of a telephone calls charge system

Θέμα

Telephone calls--Protection

Δημιουργός

Boukis, Thomas D.

Πηγή

Higher Technical Institute

Το πλήρες κείμενο είναι διαθέσιμο από το Υπουργείο Ενέργειας, Εμπορίου Βιομηχανίας και Τουρισμού

Εκδότης

Library of Cyprus University of Technology

Ημερομηνία

1992

Συνεισφέρων

Labrianides, D.

Δικαιώματα

Απαγορεύεται η δημοσίευση ή αναπαραγωγή, ηλεκτρονική ή άλλη χωρίς τη γραπτή συγκατάθεση του δημιουργού και κάτοχου των πνευματικών δικαιωμάτων.

Μορφή

pdf

Γλώσσα

eng

Τύπος

text

Αναγνωριστικό

EED0229

Σύνοψη

The primary purpose of this project is to design and
construct a telephone charge unit based on the latest
family of microcontrollers.Due to this fact the whole ccnstruction can be considered a very efficient and fast although it doesn't demand a lot of money.
First the general regulations and conditions of the
telephone network in the international level are studied.
After that the important advantages and disadvantages
of a charge unit are mentioned. Then according to the requirements of this project,the block diagram of the unit to be constructed, is given, with a brief explanation on each section. Following this, the operation of the unit is described.
The hardware design then follows, which is fully
explained, accompanied with the relevant schematic
circuits.
The unit incorporates an 80C31F OKI microcontroller
with the appropriate peripherals-all of """them are forming the CPU console-as well as the sufficient interface circuitry which provides the data to the CPU. An LCD (Liquid Crystal Display) is also provided to display the
CPU information (Time duration of communication, Number called, Number of units consumed).
Also an RS232 circuit is provided which gives to the
system the facility for communication with a printer.
After that the software developed for the
operation of this construction is described in detail.
The major conclusion that arises is the advantages
that the family of microcontroller incorporates against the
traditional microprocessors such as 8080A, 8085, 8086.
Advantages that become obvious where space, cost, and speed are prior factors in designing, constructing and producing a serious consumer product.