Presentation on theme: "ENHANCED PABX SYSTEM WITH REROUTING/LOGGING SYSTEM"— Presentation transcript:
1 ENHANCED PABX SYSTEM WITH REROUTING/LOGGING SYSTEM Esther Tina Escolastico, Niña Rica Hernandez, John Alexander Rhoss Largo,Rhett Francis Mallen, Charo Anne Marasigan, Jian Carlo Reyes,Edsel Uy, and Januel Mikel VenturanzaV – BS ECEIn partial fulfillment of the requirements in ECE 191.2March 3, 2003
2 OBJECTIVE OF THE STUDYTo implement a PABX system servicing the rooms under the ECCE departmentThe system should be able to route calls to a person’s location/room at a certain timeSignals used in the public exchange should be the ones implemented in the systemTo interface the physical system to a central computer for control, administration and decision-making
3 BACKGROUNDPrivate Branch Exchange (PBX) replaced by Private Automatic Branch Exchange (PABX) in the 1960sIntroduction of PABXNeed for flexible telephone systems that can be expanded or innovated to cater to specific consumer needsAutomatic switching of calls between local-loop users while allowing access to (an) external phone line(s)
4 BACKGROUND Introduction of PABX (cont’d.) Ateneo scene Automatic routing of calls to appropriate recipients while recipients can also communicate w/ the other users in the local networkAteneo sceneChallenge: mobility of teachersHigh rate of dropped and/or unanswered calls
5 WHY THE NEED?All consumer needs and/or requirements are not always satisfiedLevel of specificity that available g&s are unable to meet.A regular PABX only diverts calls to local numbers assigned to local telephone units/lines.End-users in a university are usually on-the-go
6 PARTS OF ENHANCED PABX A - Analog Module 1 - Local loop 2 - Loop-current detector3 - Interface to public/Ateneo exchange4 - Connection switches for the phone lines5 - Switch for the different functions6 - DTMF decoder7 - Signal generator for the different functions.
7 PARTS OF ENHANCED PABX B - Software Module C - Interface Module 1 - Main control program2 - Database3 - Voice promptC - Interface Module1 - Optoisolator2 - OR gates3 - Latches/Decoder
10 SOFTWARE DESIGN B. Database PABX system database contains the necessary information about the client like his/her name, the room where he/she is logged in, client identification codeUses Microsoft Access database formatdata control allows us to move through the records in a record set thus making the database search possible
11 SOFTWARE DESIGNOnce a Match is found, system will send Ring/Ringer signals to the two partiesOtherwise, Busy signal will be sent
12 SOFTWARE DESIGN C. Voice Prompt Module voice prompt is only applied to Tel_5, the PLDT phone lineInstead of sending a dial tone to it, a voice prompt is put in placeUsed to facilitate incoming calls
16 Latches and DecoderWhen the decoder is enabled, 3 Binary Select inputs (A0, A1and A2) determine which one of the outputs (O0–O7) will go . When enable input E3 is held LOW or either E1 or E2 is held HIGH, decoding function is inhibited and all outputs go HIGH. In our circuit, we connected the enable input E3 to the control coming from the parallel port. This control manipulates whether the decoder and latches circuit will be used or not. Enable input E1 and E2 are always connected to the ground. The outputs of the decoder are first pass to the inverters. This is because the outputs are used to enable the latches, which are active high.
17 CONCLUSIONstandard PABX system simply directs calls without the use of an intelligent decision-making schemeordinary system, calls are simply directed to a phone unit with an assigned local numberbuilds on this principle by adding a database from which the central control determines the routing destination of a call
18 CONCLUSIONproject integrated learnings from the subjects taken before, like Digital Design, Microprocessor Systems, Electronics I and II, coupled with new knowledge in programming languages like Visual Basic 6.0 and Turbo Debugger
19 RECOMMENDATIONSPABX system developed in this study can be integrated with the databases of log-in systemsfor further efficiency, the system can be expanded to include commercial features such as call waiting, call conferencing, call forwarding, and call divertingsystem could be redesigned to accommodate more subscriber lines