JPS59123394A - Party line telephone system - Google Patents

Abstract

PURPOSE:To simplify the software and processing by making a time division exchange regard a party line telephone and a single subscriber telephone as the same interface on the software. CONSTITUTION:The single subscriber telephone set S is interfaced with a time division channel network TDNW via control signal input terminal Rs of a subscriber circuit LCs, a signal output terminal Os and time slots TS, TS'. The party line telephones A, B are connected in common to a party line circuit LAB and also connected to the time slots TA, TA' and TB, TB' of a different network TDNW corresponding to the telephone sets A, B via an individual calling circuit CR, a calling telephone identification circuit CD, a coding circuit C and a decoding circuit D. Thus, the telephone set S and the telephone sets A, B are constituted so as to have the same interface with the exchange in terms of the software and network.

Description

DETAILED DESCRIPTION OF THE INVENTION TECHNICAL FIELD OF THE INVENTION The present invention relates to community subscriber telephone systems, and more particularly to community subscriber telephone systems for time division switches.

Background of the Technology In space-division switching systems, when making a call, the calling telephone line is connected to an originating register trunk (so-called ORT).
2 is connected to perform processing such as receiving dial signals, and when a call is received (2 is a ringing signal trunk (so-called R
GT) is connected to the incoming telephone line (two trunks) to send out a ringing signal.In either case, the telephone line is connected to the above trunk (==connected) via a communication path network, but in a space-division communication path network, the Since both electric power signals and DC signals can be passed through, when a joint subscriber telephone system is introduced, the calling telephone can be identified by the calling register/trunk when making a call, and when a call is received, , it is possible to selectively and individually call the called telephone on the paging trunk.Compared to single subscriber telephones, the calling telephone can be identified and individual calls can be made to the called telephone. Although additional processing is required for the joint subscriber telephone system (=), the interfaces between the joint subscriber telephone set and the single subscriber telephone set to the exchange are similar in terms of software.

Unified software processing is possible.

However, in a time-division exchange, the JJn channel network cannot pass either inductive signals or DC signals, so means such as call detection, dialed digit detection, and paging signal transmission are limited to It is installed at the input part of the line to the exchange, and these processes must be performed at the front of the network. And, these processing means are 2 lines 4
It is generally configured as a subscriber circuit together with a line conversion circuit and an encoding/decoding circuit.

Prior Art and Problems The above-mentioned concept of the prior art (2) Therefore, if we consider the time-division exchange A telephone line (common subscriber telephone line) is made to correspond to one subscriber line of an exchange, and in the subscriber circuit of that one subscriber line, it is identified which of the plurality of telephones has made the call. , and one telephone set selected under the control of the central control unit of the exchange will be individually called.

In the common subscriber telephone system with the configuration according to the above-mentioned concept of the prior art (-), in terms of software, since multiple subscriber telephones are connected to one subscriber circuit, each subscriber telephone It is necessary to control the subscriber circuits individually, and the control of the subscriber circuit for joint subscriber telephones (for two subscriber telephones) requires different control from that for single subscriber telephones.
The interface between the telephone and the single subscriber telephone was a software tool, which made unified software processing impossible and had the disadvantage that the software and processing became complicated.

OBJECTS OF THE INVENTION The present invention is intended to prevent the above-mentioned drawbacks from occurring when configured according to the concept of the prior art, and to provide a common subscriber telephone system for a time-sharing exchange (-) in which the time-sharing exchange We aim to unify the software processing by making it possible to treat both the individual subscriber telephones as an interface above the software, and to avoid complicating the software and processing. purpose.

Embodiment of the Invention The first factor is a block diagram showing the connection configuration of an embodiment of the present invention. In the figure, S is a single subscriber telephone set connected to the independent line L8, and A and B are respective communal lines. L.A.
The communal subscriber telephone set connected to B, TDSW is a time division switch, TDNW is its time division channel network, LC8 is a subscriber circuit for single subscription, LCAB is a subscriber circuit for communal subscription, and CR is a subscriber circuit for communal subscription. RG is a calling signal source, CD is a calling telephone identification circuit of a communal telephone, and CPU is a central processing unit. Portions that are less relevant to understanding the present invention are omitted from the drawings.

This type of exchange (in addition to general single subscriber telephone S
In this case, when the telephone S goes off-hook, the subscriber circuit Lee 2 detects the loop of the telephone S and sends a signal to its signal output terminal O8, and this signal is not shown in the figure. scanned with a scanning device that does not
CN) reaches the central processing unit CPU i- as a signal. The central processing unit CPU constantly monitors the above-mentioned signals, and if it detects a call from the telephone S, it moves on to the next process (2).

When the telephone 8is receives a call, the central processing unit CPU
sends a control (SD) signal to the control signal input terminal REI of the subscriber circuit LC8 via a signal distribution device (not shown), thereby sending a paging signal to the telephone set S from the subscriber circuit LC8.

The subscriber circuit LCs also has a 2-wire 4-wire conversion circuit, and the analog call signal sent from the telephone S is converted into the 2-4 wires described above.
The signal enters the encoding circuit via the line conversion circuit, is encoded (digitized), is loaded into the corresponding time slot TS, and is input to the time-division channel network TDNW. In addition, the digital call signal output from the input time slot (TSi2) TS' of the time-division call network TDNW is the subscriber circuit LC8.
The signal enters the decoding circuit, is decoded (analogized), and reaches the telephone S via the above-mentioned two-wire and four-wire conversion circuit. In this way, the telephone set S is interfaced with the exchange TDSW via the control signal input terminal R8, the signal output terminal OB and the time throwers (TS, TS') of a single subscriber circuit LC8.

According to the present invention, the communal telephone set is also connected to the exchange TD.
It is designed to provide a unified interface to the SW, similar to a single subscriber telephone.

The joint subscriber telephones A and B are jointly (= connected) to the joint subscriber line LAB, and the joint subscriber line LAB connects the 2nd line to the 4th line through the individual calling circuit CR and the calling telephone identification circuit CD of the joint subscriber telephone set. The public telephones A and B (two corresponding time-division channel networks T
DNW different time throwers) TA, TA' and T
B and TB' are connected.

Now, if the community subscriber telephone A (-) is placed off-hook, the loop of the telephone A will be detected by the calling telephone identification circuit CDi2, which will identify which of the community subscriber telephones A and H is making the call. , telephones A and B (2 corresponding to 2)
A signal is sent to the output terminal OA corresponding to the telephone A out of the signal output terminals OA s OB, and this signal is scanned by a scanning device (not shown) and scanned ( SCN) signal as central processing unit C
PU (2) The central processing unit CPU monitors the above signal, detects the call from telephone A from its signal output terminal OA, and then performs the following process (transfers to 2). When a call is made, the same processing as above is performed using the signal from the signal output terminal oB.

The above telephone A (if there is a second call, the central processing unit CP
U sends a control (SD) signal through a signal distribution device (not shown) to two control signal input terminals RA of the individual calling circuit CR of the communal subscriber telephone, corresponding to telephones A and B, respectively.
p RB is sent to one input terminal RA corresponding to telephone A, and this input signal controls the individual call port CR, and a ringing signal is sent to telephone A corresponding to input terminal RA.

It is connected to the time-division channel network TDNW and another common subscriber telephone A by assigning time throwers) TA, TA', and also to the time-division channel network TDNW and another common subscriber telephone B (time thrower). Assigning TB, TB' (from the second subscriber circuit L
The connection is made via CAB, and the communication path of the communal telephone set (interface 2 for 2) is connected to the control signal (calling signal sending control signal) input terminal for the single subscriber telephone set (e.g. S). Re and the central processing unit CPU via the scanning signal (signal indicating the state) output terminal O8.
interface to the human-powered time slot TS,
The output time slot TS' is then forwarded to the time-division channel network TDNW. In addition, the communal subscriber telephones A and B each have a control signal input terminal R.
A and RB scanning signal output terminals oA and O, B interface to the central control unit CPU, and input time slots TA and TA', time slot T
B and TB' represent the time-division channel network TDN.
It has a tuna interface. As is clear from the above, both the individual subscriber telephone set and the joint subscriber telephone set are configured to have similar software and network interfaces to the exchange.

FIG. 2 shows an outline of the configuration of an example of a subscriber circuit LCAH for joint subscription including the individual calling circuit CR of the communal subscriber telephone shown in FIG. 1 and the calling telephone identification circuit CD.

In Fig. 2, A and B are communal subscriber telephones connected in parallel with the communal subscriber line LAB +-, and the pel Beta of telephone A is between the a line of the communal line LAB and the earth (the two-capacitor Ca The hook switch contact H8a is connected in such a way that capacitor Ca is short-circuited when off-hook, and the bell Betb of telephone B is also connected between the B wire and the earth (via capacitor Cb). connected.

Select telephone A and call it individually (in case of double calling, control signal input terminal RA of individual calling circuit CR from central processing unit CPU)
A control signal (SD double signal is sent to the individual calling circuit CR
Now, this control signal is switched to the input terminal RA. The call signal from the call signal source RG (a) of the changeover switch SW
) side contact, relay contact r1, and wire a, the signal flows from the bell Beta of telephone A to the ringing signal source RG via capacitor Ca and the earth, and rings the bells f3el and a of telephone A. Since telephones A and B are on hook, telephone B's ring signal does not flow and does not ring, and only telephone A is individually called.

However, when a signal is sent from the central processing unit CPtT to the input terminal RH of the individual call circuit CR, the selective call circuit C
R is a signal received at the input terminal RB (Secondly, unlike the previous case, the selector switch SW is operated and turned to the BL side, and the relay R (not shown) is operated in the same way as in the previous case. The ringing signal from the ringing signal source RG flows from the bell BeAb of the telephone B through the (b) side contact of the changeover switch SW, the ring contact r2, and the b line to the ringing signal source RG via the capacitor Cb and the ground. B's bell BeL b
sound. Since telephones A and B are on-hook, telephone A's bell signal does not flow and does not ring, and only telephone B is individually ringed.

As described above, by selecting one of the input terminals RA or RB of the individual calling circuit CR and sending a control signal from the central processing unit CPU, the corresponding telephone 11A or B can be selectively called.

Suppose that either telephone A or telephone B goes off-hook. In the calling telephone identification circuit CD, the power supply and loop detection circuit connects from the terminal ta of the power supply and loop detection circuit to the stationary relay contact r1 of the individual calling circuit CR, the a line, the telephone A, (telephone If B is off-hook, the telephone B) line b, stationary relay contact r'L1 of the selective calling circuit CR, terminal tb of the feed element SR via stationary relay contact d0 of the calling telephone identification circuit CD;
(=When it is detected that all the DC circuits are configured and the power supply and loop conversion circuit of telephone A or B is detected as a loop, relay D (not shown) is activated for one hour. Contact d0 of D opens, disconnects the tb terminal, stops the supply of earth air to the b line, and connects the a with only the ta line.
Detect the line's earth energy. When telephone A is off-hook, the ground air connected to the bell Beta to the telephone via the hook switch H8a is applied to the A line via the bell Beta, so the ground air is detected. , if phone B is ono hook, the above ground air is restored to the hook switch H8 & is cut off by the capacitor Ca, and the A line (
- does not appear, and the earth air of the bell Betb of the telephone iB is also blocked by the capacitor cb in a direct current manner, and the b line (the two earth air are not connected, so the earth air is not detected. When earth air is detected, the information is sent to the identification earth air sending circuit ED through the closed contact d1 and output to its output terminal EA, and when earth air is not detected, the same output terminal EBi2 outputs a signal. Yes, then FD
When the outputs from the output terminals EA and EB are inputted, a logical operation is performed, and the loop detection output is inputted, when there is a signal at the output terminal EA of the discrimination earth sending circuit ED,
A signal is sent to the output terminal OA+- of the calling telephone identification circuit CD, and a signal is also sent to the output terminal EB. FIG. (In addition, as is well known, the number of communal subscriber telephones is not limited to two, but there are also communal subscriber telephone systems that can accommodate many more, but the present invention is applicable to the individual calling system and calling system of the communal subscriber telephone system. It is not intended to be a call telephone identification method, and any of them may be used.

Note that the relay contact r1. in FIG. rtr corresponds to contact r in FIG.

Although two embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications can be made within the technical scope thereof.

Effects of the Invention As described above, according to the present invention, when a time division switch (when accommodating two joint subscriber telephones), each joint subscriber telephone can be regarded as the same as the interface of a single subscriber telephone,
There is no need to differentiate the software and software processing for the above-mentioned types of telephones, and it is possible to unify them, and there is an effect that the software and its processing do not become complicated even if joint subscriber telephones are mixedly accommodated.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a connection configuration of an embodiment of the present invention, and FIG. 2 is a block diagram of a selective calling circuit and a call identification circuit of a communal telephone set that can be used in the embodiment of FIG. S...Single subscriber phone, A, B...Joint subscriber phone, Ls...Single line, LAB...Joint line, TDS
W...Time division switch, TDNW...Time division channel network, central processing unit, Beta, Betb...
・Bell, RG... Calling signal source, ED... Identification earth sending circuit, L... Power supply and loop detection circuit, LG...
・Logic circuit, H2 repeat-tp@48 times ・Patent applicant Fujitsu Limited agent Patent attorney Gobe Tamamushi (6 others)

Claims (1)

[Claims] In the joint subscriber telephone system for time division exchanges, the individual calling circuit and calling telephone identification circuit of the joint subscriber telephone connected to the joint subscriber telephone line accommodating a plurality of joint subscriber telephones, and the Each subscriber circuit is provided with two pairs of subscriber circuits, and the individual calling circuit has an input terminal for a control signal corresponding to the communal subscriber telephone set, and a control input terminal to the input terminal (two pairs of subscriber circuits corresponding to the input terminals) is provided. The caller is selectively connected to the joint subscriber 1 (2) to make an individual call, and the calling telephone identification circuit is connected to the joint subscriber telephone y.
/, (= has a corresponding signal output terminal and is configured to send out a signal (-) to an output terminal corresponding to the calling communal telephone, and each communal telephone telephone receives a control signal input to the corresponding individual calling circuit terminal and the signal output terminal of the calling telephone identification circuit, and further a subscriber circuit corresponding to the communal telephone set, which interfaces the time division switch (2), and the soft interface and the network interface for the single subscriber telephone set. A joint subscriber telephone system characterized by having the same interface as .