CN2131259Y

CN2131259Y - Party-line system for multiple group-telephones

Info

Publication number: CN2131259Y
Application number: CN 92230938
Authority: CN
Inventors: 张国武
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-08-22
Filing date: 1992-08-22
Publication date: 1993-04-28
Anticipated expiration: 2002-08-22

Abstract

The utility model belongs to a telephone device of a communication system, particularly relating to a party-line system for multiple group-telephones, which comprises a telephone outside line and telephones. The outside line is connected with a mainframe, and the mainframe is respectively connected with a controller of each telephone extension through two internal lines. Each telephone extension controller is connected with the telephone. The mainframe comprises power supply, an internal line number forwarding circuit, a dial tone supplying circuit, and an outside line interface circuit; the extension telephone controller comprises a power supply circuit, an electronic switching circuit, a blind tone generating circuit, a ringing number recognition circuit, a busy signal occurring circuit, and an internal line busy or idle testing circuit. Compared with the prior art, the art of party-line system for multiple group-telephones achieves the purpose that the outside line can directly dial into any user telephone, and has the performance of mutual calling among extension telephones. In addition, the utility model has the function of hang rushing. Because of having the advantages of low production cost, and convenient installation, the utility model can be used for a telephone communication system.

Description

Party-line system for multiple group-telephones

The utility model belongs to the telephone device of communication system, the telephone device of particularly a kind of multiple-workstations group.

Along with the develop rapidly of science and technology, communication has become the important means of world today's information interchange, and especially phone has entered huge numbers of families, has brought convenience to people.But thing followed problem is: because the telephone communication circuit is in short supply, host capacity is limited, can not utilize existing equipment to connect more telephone sets, so occurred a kind of telephone system of multiple-workstations form on the market, can connect 2-3 portion phone on same circuit, solve the problem of phone anxiety to a certain extent.But this system is number dialing telephone call mutually, and every extension was all can jingle bell interfering with each other when especially Wai Bu phone was squeezed into.A kind of multiple-workstations group telephone that the utility model purpose designs in order to overcome above-mentioned shortcoming with little SPC telephone exchange basic function.

The utility model is compared with original technology, has been to realize that outside line directly dials in the purpose of any subscriber phone, and the mutual call performance of extension set is arranged.If being interior lines, another characteristics of the utility model in use have outside line to dial in also to have the extension of breaking function.Because this machine is cheap for manufacturing cost, easy for installation, can extensively put goods on the market.

Below in conjunction with accompanying drawing the utility model is described further

Accompanying drawing 1, multiple-workstations group telephone apparatus structure schematic diagram

Accompanying drawing 2, multiple-workstations group telephone device main frame block diagram

Accompanying drawing 3, multiple-workstations group telephone device extension set block diagram

Accompanying drawing 4, multiple-workstations group telephone host circuit schematic diagram

Accompanying drawing 5, multiple-workstations group telephone extension circuit schematic

The utility model is a kind of party-line system for multiple group-telephones that is made up of outside line and telephone set, it is to connect a main frame on outside line, main frame is connecting 1-20 extension controller side by side by two interior lines, each extension controller be connected with telephone again (such as Fig. 1), the extension set management circuit is housed in the extension controller, can carry out work by control extensions, and the various signals of extension are provided. Do narration with regard to the utility model implementation below.

When the user uses phone, detect interior lines operating position in the telephone line by the extension set management circuit in the extension controller, if interior lines are occupied, then the extension set management circuit just produces the busy tone signal and gives the user, if the interior lines free time, main frame sends dialing tone automatically, can dial after the user listens.

When the user dials the intercommunication phone extension, main frame can become pulse train with the signal that the user transfers to, pass through interior lines, send in each extension set management circuit, if the number in the pulse train and (needed a certain) are when extension is identical, this extension set just begins jingle bell logical this extension, and the user can converse.

If the interior lines extension subscriber carries out outward dialing, the user dials " # " number key on the phone earlier, just exterior-line interface circuit is told outside line automatically in the main frame, hears that the outward dialing sound both can dial outside line key, cries logical outside line.

When outside line will be gone into this group's phone, dial earlier the main frame outside line key, hear this machine dialing tone after, dial extension again and both can directly be extension set (at double-tone frequently under the state).If the user does not dial extension, time-delay 5-10 aft engine second can be connected automatically and specify extension set.

When outside line will be gone into this machine, if it is occupied to run into interior lines, outside line can be heard normal ringback tone, main frame can send prompt tone urge extension, interior lines on-hook to interior lines after, the outside line user can hear the dialing tone of this machine, just can dial the extension number of wanting.

Respectively the utility model main frame and branch machine controller are described further below.

Main frame is formed (Fig. 2) by source circuit, different extension repeat circuit, dialing tone supply circuit and exterior-line interface circuit.Host circuit principle such as Fig. 4.

Host power supply circuit is by power transformer rectifier, filtering and voltage stabilizing and increase the internal resistance circuit and form, and pressurizer output is for main frame, and filtered direct voltage is through by triode BG ₁The inside line of forming of interior resistance circuit that increases is powered.Be connected to switching tube BG at the negative terminal that connects the interior lines power supply ₃, BG ₄, may command is to the break-make of extension set power supply.Power unit also has by BG ₂The current foldback circuit of forming.

The different extension repeat circuit is by double-tone frequency number identification circuit MT8870 and number decoding circuit CD4514, serial code transtation mission circuit ZH89026 and gate circuit 20,21,22 and composition such as two monostable circuit CD4098, the interior lines signal is after the operational amplifier low-pass filtering is input to double-tone frequency identification circuit MT8870, can identify the user dials the number, decipher through CD4514 again, translate the intercom number that the user dials and remove to trigger monostable circuit CD4098, monostable circuit output signal starting serial code transtation mission circuit ZH89026 exports serial code to power switch circuit by ZH89026 again.Decoding circuit translates and then starts exterior-line interface circuit when the user dials " # " number key.

The dialing tone supply circuit is by triode BG ₅, BG ₆, and gate circuit 3-5 form.The rectification again after triode amplifies of the signal of interior lines, filtering make gate circuit 5 vibrations produce dialing tone and deliver to interior lines through reverser 3 and 4.

Exterior-line interface circuit is by operational amplifier MC4558, tone decoder LM567, two monostable circuit CD4098 and gate circuit 8-19 and triode BG ₇-BG ₉, form.When outside line will be gone into interior lines, from the bell signal of outside line outside line is inserted, outside line can be dialled intercom number, with the interior lines user's communication.Talk-through outside line user deduction circuit just can produce the busy tone signal interrupts outside line and interior lines.When inside wanted outside, user's " # " number key of can dialing joined inside and outside circuit, can dial outside number conversation.

Interior lines user's deduction disconnects interior lines, outside line behind the talk-through.

Dividing machine controller (Fig. 3) to produce circuit, engaged signal generation circuit, the busy not busy testing circuit in interior lines, number identification circuit and ringing circuit by power circuit, phone electronic switching circuit, busy tone forms.Fig. 5 is for dividing the circuit theory diagrams of machine controller.

Divide machine controller mainly to form by Schmidt trigger CD4093 double D trigger CD4013 and decoding circuit ZH89027.

The Exgt Bat extension battery circuit is to give the power supply of extension set management circuit by the power supply that interior lines are obtained after voltage stabilizing.

The phone electronic switch is by triode BG ₄, BG ₅, form, its function is that the control extension telephone is received and do not received above the interior lines.

Interior lines busy-idle condition testing circuit is after the signal in the interior lines is amplified, and rectification again, filtering, through reverser 1 make d type flip flop can control the phone electronic switch and the work of the line is busy oscillator gate circuit 5.

The extension identification circuit is by gate circuit 4 pulse on the interior lines to be input to number identification circuit ZH89027, connects high level respectively or low level is set extension by the 3-7 pin of ZH89027, and recognition result is sent by 17 pin.

The extension set ringing circuit produces the tinkle of bells by gate circuit 7,8,9 and sends into phone.

It is to be produced by gate circuit 2 and 3 that busy tone produces circuit, through the resistance diode machine anode of answering.

Claims

1, a kind of telephone device that belongs to communication system, particularly a kind of multiple-workstations group telephone device.It is made up of outside line and telephone set; It is characterized in that: outside line connects a main frame, and main frame is connecting each extension controller respectively by two interior lines, and each extension controller is connected with phone again.

2, device according to claim 1 is characterized in that: described main frame is made up of power circuit, different extension repeat circuit, dialing tone supply circuit and exterior-line interface circuit.

3, device according to claim 1 is characterized in that in the machine controller power circuit being arranged in described minute, phone electronic switching circuit, busy tone produce circuit, ring number identification circuit, ringing circuit, engaged signal generation circuit, and the busy not busy testing circuit in interior lines is formed.

4, device according to claim 1; It is characterized in that described different extension repeat circuit is by double-tone number identification circuit and number is recalled decoding circuit, the serial code transtation mission circuit is formed frequently.