CN1115933A

CN1115933A - Bus-type telephone system

Info

Publication number: CN1115933A
Application number: CN 94113682
Authority: CN
Inventors: 谢瑞和; 王晨
Original assignee: Huazhong University of Science and Technology
Current assignee: Huazhong University of Science and Technology
Priority date: 1994-11-04
Filing date: 1994-11-04
Publication date: 1996-01-31
Anticipated expiration: 2014-11-04
Also published as: CN1054246C

Abstract

The present invention relates to wire communication techn and is esp suitable for the case of paging telephone. Without need for interconnecting device and distributor, decades or hundreds of user telephone are connected to inner bus to form a new-type bus-type paging telephone system. The said telephone system has high cost performance and small volume with the controller including power supply being in the size of common telephone set, so that it may be widely used in various organization.

Description

Bus-type telephone system

The present invention relates to a kind of cable communicating technology.

By the ZDP type messenger call that Lan Te company of Zhejiang University produces, this system only uses pair of telephone lines, can articulate hundreds of phones by intermediate links such as main control system, transducer and distributors.But intermediate links such as adapter and distributor will be passed through by system, and the distributor user oriented still is a star structure.

At the shortcoming of above-mentioned technology formerly, task of the present invention provides a kind of adapter and distributor of not needing, and tens or hundreds of subscriber phones is attempted by on the internal bus, with the identical bus type structure messenger call of the layout of power line system.

The present invention implements by following technical measures, it constitutes (Fig. 1) by controller and internal bus, described controller CONT ROLLER one end connects with outside line OUTSIDELINE, the other end connects with internal bus INSIDE BUS, internal bus is a four-wire system, it comprises the decoder power line, data wire and a pair of voice signal line, subscriber phone TELEPHONE is attempted by on the internal bus respectively, between internal bus and subscriber phone, seal in a combination lock CODE LOCK, wherein the hardware circuit division of combination lock and controller is as follows: (1) telephone number lock CODE LOCK is made of address decoder DECODE and electronic switch ELECTRON SWITCH, address decoder DECODE receives the address serial sign indicating number on the data wire, after decoding successfully with electronic switch ELECTRON SWITCH conducting, connect phone TELEPHONE, cut off phone otherwise electronic switch ends; (2) the microprocessor MICROPROCESSOR in the controller (CONTROLLER) respectively with availability indicator BUSY DE-TECTOR, urgent call device INTERUPT CALL, ringing-current detector RINGTEST, dislodging machine testing device RING ON/OFF TEST and encoder EN-CODE connect, the encoder ENCODE other end connects with data wire, the dislodging machine testing device RING ON/OFF TEST other end connects with induction coil one end, the induction coil other end connects with ringing current generator RING GENERATOR and tone generator SIGNAL GENERATOR, and the ringing-current detector RING TEST other end connects with outside line OUTSIDE LINE.

Advantage of the present invention is very transparent, (1) with low cost, multiple functional, has the incomparable ratio of performance to price of other kinds internal electrical phone network, the average installation cost of every extension set (comprises phone, combination lock and main control system, power supply) the face broad that fluctuates, depend primarily on the selection of user to telephone set, phone can be chosen commercially available various product, need not design separately and produce, (2) stringing wire rod and engineering cost have been saved greatly, bring convenience to line upkeep simultaneously, the general user all can settle a dispute by the parties concerned themselves, (3) function and using method and traditional small switch are identical, can be widely used in the dormitory, the hotel, residential neighborhoods, hospital ward, the office scheduling, part villages and towns in rural areas and enterprises and institutions.

Description of drawings is as follows:

Accompanying drawing 1, bus type structure messenger call system block diagram.

Accompanying drawing 2, electronic lock theory diagram.

Accompanying drawing 3, controller principle block diagram.

It is as follows that the invention will be further described in conjunction with the accompanying drawings: the present invention has only an internal bus INTERNAL BUS, between bus and subscriber's extension station TELEPHONE, seal in a combination lock CODE LOCK, this combination lock is simple in structure, come down to an address decoder, entire circuit is installed in the plastics capsule of a card holder size, the terminal box that only is equivalent to black phone, can not bring extra trouble, when the number that sends on the bus and extension address meet, combination lock is opened, and this extension telephone and bus are connected.In case there are two extension sets to connect on the bus, or extension set and outside line connection, other extension set total deadlock on the bus can't be eavesdropped current dialogue in isolation, has realized secret telephony reliably.Accompanying drawing 2 is the theory diagram of combination lock.Address pulse on the bus is imported by data wire, and when consistent with this address code, the output of decoder DECODER makes electronic switch ELECTRON SWITCH conducting, thereby telephone set and bus connection, otherwise telephone set and bus isolation are the resistance state.Bus of the present invention adopts four-wire system; The power supply of decoder (+5v) with data wire DATA and a pair of voice signal line L ₁, L ₂Transformer is used for the signal coupling between internal connection INSIDELINE and the outside line OUTSIDE LINE between controller (Fig. 3) center line.The address code coding back serial that encoder EN-CODE brings microprocessor MICROPROCESSOR sends to data wire and receives for decoder.In a single day detect a certain caller off-hook during INCOM intercom and receive the number that caller sends by dislodging machine testing RINGON/OFF TEST then, open called extension set again,, can converse behind the called off-hook to the called ring back tone NING that send to caller feed signals sound SIGNAL.Because other extension sets are not all opened, so even off-hook can not influence current talking yet, and can't hear dialog context, realized secret telephony, ringing-current detects NING TEST and is used to detect the ringing signal of outside line OUTSIDELINE incoming call, in case the outside line ringing-current is arranged, main frame prepares to receive extension, automatically connect called extension set behind the caller dialing sign indicating number, outside line and interior lines are connected.Pull out earlier during interior lines call extension outside lines " 0 ", pull out outside line key then, microprocessor control J1 realizes digit retransmission, thereby need not the person on duty and get involved the user that to give connection to external call automatically, when running into urgent affairs, the personnel of machine hall can be by " interrupt call " INTERUPT CALL key, interrupts active user's conversation and calls out arbitrary extension set at any time.

Claims

1. telephone system that constitutes by the controller and the internal bus of hardware and software combination, it is characterized by described controller (CONTROLLER) end connects with outside line (OUT-SIDE LINE), the other end connects with internal bus (INSIDE BUS), internal bus is a four-wire system, it comprises the decoder power line, data wire and a pair of voice signal line, subscriber phone (TELEAPHONE) is attempted by on the internal bus respectively, seal in a combination lock (CODE LOCK) between internal bus and subscriber phone, wherein combination lock (CODE LOCK) is as follows with the hardware circuit division of controller (CONTROLLER):

(1) telephone number lock (CODE LOCK) is made of address decoder (DECODE) and electronic switch (ELECTRON SWITCH), address decoder (DECODE) receives the address serial sign indicating number on the data wire, after decoding successfully with the electronic switch conducting, connect phone (TELEPHONE), cut off phone otherwise electronic switch ends;

(2) microprocessor (MICRO-PROCESSOR) in the controller (CONTROLLER) respectively with availability indicator (BUSY DETECTOR), urgent call device (INTERUPT CALL), ringing-current detector (RING TEST), dislodging machine testing device (RING ON/OFF TEST) and encoder (ENCODE) connect, encoder (ENCODE) other end connects with data wire, dislodging machine testing device (the RING ON/OFF TEST) other end connects with induction coil one end, the induction coil other end connects with ringing current generator (CRING GENERATOR) and tone generator (SIGNALGENERATOR), and ringing-current detector (RING TEST) other end connects with outside line (OUTSIDE LINE).