CN1054246C - Bus-type telephone system - Google Patents

Abstract

The present invention relates to a wire communication technology which is especially suitable for occasions of paging telephones. The present invention does not need a commutator or a distributor, and dozens or hundreds of user's telephones are connected to an inner bus in parallel by the present invention, which has the fully same arrangement as power lines so as to be a fire-new paging telephone system with bus type structure. The present invention has the advantages of low cost, full function, cost performance much higher than various other inner telephone networks and small volume, and the complete volume of a controller (comprising a power supply) is only equivalent to a hand-free telephone. Moreover, the present invention can be widely used for dormitories, hotels, resident residential areas, enterprises, institutions, hospital wards, office dispatch, villages, etc.

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 homemade telephone sets 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 (see figure 1) by controller and internal bus, and described controller one end connects with outside line, and the other end connects with internal bus, internal bus is a four-wire system, and it comprises decoder power line, data wire and a pair of voice signal line L ₁With L ₂Subscriber phone is attempted by on the internal bus respectively, between internal bus and subscriber phone, seal in a combination lock, wherein the hardware circuit division of combination lock and controller is as follows: (1) telephone number lock is made of address decoder and electronic switch, address decoder receives the address serial sign indicating number on the data wire, with the electronic switch conducting, connect phone after decoding successfully, cut off phone otherwise electronic switch ends; (2) microprocessor in the controller connects with availability indicator, urgent call device, ringing-current detector, dislodging machine testing device and encoder respectively, the encoder output connects with data wire, the dislodging machine testing device other end connects with induction coil one end, the induction coil other end connects with ringing current generator and tone generator, and the ringing-current detector other end connects with outside line.

Whether said availability indicator is used to indicate outside line and interior lines to take among the present invention; The urgent call device is used for host phone and inserts the both sides of current talking as the third party, requires dropped calls or dropped calls by force; The ringing-current detector is when outside line has ringing-current, control contact J ₁Connect, be equivalent to called subscriber's off-hook, can with controller be communicated with outside line by induction coil this moment, and controller signals to the outside line caller and requires to dial extension; Dislodging machine testing device is used to detect the off-hook/on-hook action of completely restricted extension and the pulse that inner calling subscriber transfers to/double-tone frequency number; Ringing current generator is by control contact J ₃Called extension set send ringing-current to inside; Tone generator is by control contact J ₂Send dialing tone for the completely restricted extension user, the warning tones etc. of prescribing a time limit.

Advantage of the present invention is: (1) is with low cost, multiple functional, has the incomparable ratio of performance to price of other all kinds of internal electrical phone networks, the average installation cost of every extension set (comprising telephone set, combination lock and main control system and 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) saved line materials and engineering cost greatly, brought convenience to line upkeep simultaneously, the general user all can settle a dispute by the parties concerned themselves; (3) function and using method are identical with traditional small switch, can be widely used in dormitory, hotel, residential neighborhoods, hospital ward, office scheduling, part villages and towns in rural areas enterprises and institutions.

Description of drawings is as follows:

Accompanying drawing 1: bus type structure messenger call system block diagram;

Accompanying drawing 2: combination 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, between bus and subscriber's extension station, seal in a combination 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, only is equivalent to the terminal box of black phone, can not bring extra trouble, when the number that sends on the bus and extension address met, combination lock was 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 deadlocks on the bus can't be eavesdropped current dialogue in isolation, have realized secret telephony reliably.

Accompanying drawing 2 is the theory diagram of combination lock, and the address pulse on the bus is imported by data wire, and when consistent with the local address sign indicating number, the output of decoder makes the electronic switch conducting, thereby telephone set and bus connection, otherwise telephone set and bus isolation are high-impedance state.Bus of the present invention adopts four-wire system: the power line of decoder and data wire and a pair of voice signal line L ₁, L ₂

Induction coil in the controller (accompanying drawing 3) is used for the signal coupling between internal connection and the outside line.The address code coding back serial that encoder is brought microprocessor sends to data wire and receives for decoder.In a single day detect a certain caller off-hook during INCOM intercom to this caller feed signals sound, receive the number that caller sends by dislodging machine testing device then, open called extension set again,, can converse behind the called off-hook to the called ring back tone that send.Because other extension set is not all opened, so even off-hook can not influence current talking yet, and can't hear the content of conversation, realized secret telephony, the ringing-current detector is used to detect the ringing signal of outside line incoming call, in case the outside line ringing-current is arranged, even main frame prepares to receive the required extension of outside line user, automatically connect called extension set after the outside line caller is dialled the number, outside line and interior lines are connected.Then dial " 0 " earlier during interior lines call extension outside lines, dial outside line key then, microprocessor is connected control contact J ₁The realization number is transmitted, thereby need not the person on duty get involved the user that can give connection to external call, and when running into urgent affairs, the main frame operator on duty can interrupt active user's conversation and call out arbitrary extension set at any time by " interrupt call " key.

Claims (1)

1. bus-type telephone system, it is characterized by, controller one end connects with outside line, the other end connects with internal bus, internal bus is a four-wire system, and it comprises decoder power line, data wire and a pair of voice signal line, and subscriber phone is attempted by on the internal bus respectively, seal in a combination lock between internal bus and subscriber phone, wherein the hardware circuit division of combination lock and controller is as follows:

(1) telephone number lock is made of address decoder and electronic switch, and address decoder receives the address serial sign indicating number on the data wire, decode successfully after with the electronic switch conducting, connect phone, otherwise electronic switch ends and the cut-out phone;

(2) microprocessor in the controller respectively be used in reference to the timberline road whether occupied availability indicator, be used for urgent call device that host phone chips in as the third party, be used to detect the outside line ringing-current and by control contact J ₁The ringing-current detector of giving connection to external call, be used to detect completely restricted extension off-hook/on-hook action and send pulse/double-tone that the dislodging machine testing device and the encoder of number connect frequently; The encoder other end connects with data wire; The dislodging machine testing device other end connects with induction coil one end; The induction coil other end is except that with internal speech line L2 connects, also with pass through J ₃Send the ringing current generator of official seal stream and pass through J to called extension set ₂Tone generator to caller extension set feed signals sound connects; The official seal current sensor other end connects with outside line.

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