JPS5825754A - Premises centralized telephone device - Google Patents

Abstract

PURPOSE:To prevent the degradation of the service quality, by constituting an operator trunk, a cord circuit, and a controlling circuit with digital signal processings to prevent the reflection and the coming-round due to mismatching of the impedance in a converting part from two wire to four wire. CONSTITUTION:Time slots of an outside line, an extension, and an operator line are transmitted to a digital multiple signal highway and are inputted to a service path memory 250. A time slot arrangement read out from the memory 250 uses an expanding circuit 411, gate circuits 412 and 413, and delay circuits 421 and 422 to generate signal trains, and they are added in an adder 430 and are demodulated to the original PCM code train in a compressing circuit 431 and are written sequentially in a service path memory 270. Contents read out from the memory 270 are transmitted in accordance with a server Cn, an outside line A1, and an extension B1. In case of holding, an idle circuit tone X1 is transmitted to the outside line A1, the extension B1, and the server Cn.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an office group telephone system using a digital telephone exchange.

Conventionally, this type of equipment was constructed using the 5KJ2G system, such as office group telephone equipment using DIO type automatic exchanges, so even in subscriber line exchanges like digital telephone exchanges, the communication path was constructed using a 4-wire system. If you apply this as is to a switchboard that has a digital 4-wire switch, analog 2
It has a built-in wire trunk. That is, 4
The connection configuration is wire (digital) → 2 wire (analog) conversion, analog handler trunk, and 2 wire (analog) → 4 wire (digital) conversion, and reflections due to impedance mismatch in the 2 wire → 4 wire conversion section are avoided. This method has the disadvantage that looping occurs, deteriorating the quality of the call.

The present invention has been made in order to eliminate the drawbacks in the prior art as described above, and an object of the present invention is to replace the operator trunk, string circuit, and control circuit necessary for business group telephone service with digital signal silver [K It is an object of the present invention to provide a collective telephone system for business establishments configured without performing analog conversion.

The main point of the configuration of the present invention is that in a digital subscriber line system, voice time slots from outside lines, voice time slots from extension lines, voice FI4A sat from operators, and silent tone. The time slots are held in a first call path memory, and the time slots to be processed are sequentially read out in chronological order according to the contents of the first call bus control memory to form a digital multiplex signal string, and a digital multiplex signal is generated. A signal synthesis circuit synthesizes the signals into a digital multiplexed signal sequence consisting of a voice time slot from an outside line and a silent time slot, and this synthesized signal is further held in a second call path memory, and A digitized operator trunk is provided which can read the composite signal from the second call path memory and control connection to the outside line time slot, extension line time slot, and operator time slot, respectively, depending on the contents of the control memory, The feature is that the functions of three-party calls consisting of personal calls, calls between extensions and handlers, and calls between outside lines, extensions, and handlers are made possible by voice synthesis using digital multiplexed signals.

Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention, that is, an overall configuration diagram of an office group telephone system inferior to the present invention, including a digitalized operator trunk-related device. In the figure, 11G is a concentrator communication path, 113 and 114 are subscriber lines (in particular, subscriber lines that are connected to telephones within a business group are called extension lines), and 111 and 112 are communication lines within the business group. Subscriber telephone equipment, 12G is a distribution stage communication path, 115 is a digital jL4 duplex No. 11 highway connecting the concentration stage communication path 11G and distribution stage communication path 120, and 125 is a toll line in the form of a digital multiplex signal highway. (Here, simply referred to as outside line), 126 is a digital signal processing trunk (for device operation, if necessary, refer to Musashino Telecommunications Research Institute Research and Practical Application Report J, Vol. 128, No. 7, pages 1302-1308), 150 is a digital signal processing trunk of the present invention. The basic digitization operator trunk 140 is a conversion device (here, a code
c), 135, 148, 155 are digital multiple signal highways connecting these devices, 170
171 is a control circuit for indicating an incoming call to the operator, 172 is a response detection circuit for the operator, 180 is a reception desk installed in the building, 181 is a handset, 182 is an incoming call indicator lamp, and 183 is for response. It's an electric key.

Next, let's take a look at the overall operation using an example of connecting an incoming external line via a reception desk. I will clarify. Outside m! An incoming call from the reception desk 125 is received at the reception desk 126 and connected to the digitization operator trunk 150 via any channel of the digital multi-signal highway. . Next, when the incoming call lamp 182 of the reception table 180 is lit via the lamp control circuit 171, the operator presses the response telephone key 183 and sends an operator response signal to the response detection circuit 172. After receiving this signal, the digitized operator trunk 150 establishes a connection with the seat apparatus 170 via the Codec 140 and connects with the operator. Through this connection path, the extension number is sent and received between the outside line and the operator, and the operator uses a digit sending telephone key (not shown) to send the extension number to the exchange side (number reception is performed by the digital signal processing trunk 126). ). The exchange calls an extension (for example, telephone 111) based on the received digits. At this time, a ring tone (R
BT). In response to the extension response, after a regular call between the extension and the external operator, the system moves to the operator recovery state. Disconnection/termination is the same as normal call connection, so the explanation will be omitted.

FIG. 2 is a block diagram showing an example of the configuration of the digitization operator trunk 150 used in the present invention. In the same figure, 221 and 222 represent the digitization operator trunk 150.
The ingress highways 231 and 232 are the line-of-sight ways from the digitization operator trunk 150 to the digital communication path 120, and highways 221 and 231 are the paired up/down highways of the digital multiplex signal highway 135. Yes, as well as highways 222 and 232
This is also the up/down link of the digital multiplex signal highway 145. 223 and 233 are the opposite highways of the digital multiplex signal highway 15s connected to the seat device 170 of the office collective telephone device; 223 is the incoming line highway to the digitization operator trunk 150;
3 is the outbound highway. (221-1), (22
2-1), (223-1) are phase synchronization circuits for each input line highway, 24G is a clock circuit for multiplexing each input line, 241 is a digital multiplex line that multiplexes each input line, 250.270 , lj path memory, 26G is a signal synthesis circuit, 261. ! @2 is a call password of 250 yen.
270 and the signal synthesis circuit 260. 251 is a call bus memory 2500 control memory; 271 is a call bus memory 2700 control memory; 252
, 272 are registers for receiving control data.

FIG. 3 is an explanatory diagram showing an example of a frame structure of a digital multiplexed signal. In the figure, 301, 302, and 303 are signal frames on the digital multiplex signal highway 221, 222, and 223 in FIG. 2, and 304 is a signal frame on the digital multiplex signal highway 241 in FIG.

FIG. 4 is a circuit diagram showing details of the signal synthesis circuit 260 in FIG.
It is an explanatory diagram explaining the above signal arrangement. In the same figure,
401, 402, 403 are 301, 302, 3 in Figure 3
03 indicates the portion stored on the call bus memory 250. Reference numeral 404 is a part storing a no-call pattern, and it is assumed that the no-call pattern is written in advance. 410 is a signal string read out from the speech bus memory 250; 411 is an expansion circuit having a function of expanding the compressed PCM signal and reducing the level to 172;
12.413 is a gate circuit, 420 is a gate signal, 42
1 is 1 time slot on the 410 signal train (period τ0)
422 is a 3-time slot delay circuit, 430 is an adder circuit, and 431 is a compression circuit that compresses at the same ratio as expanded by the expansion circuit 411.

The operation of the digitizing operator trunk 150 of the present invention will now be described with reference to FIGS. 112-4.

In Figure 2, outside @221. Extension 222, operator line 22
Each input signal from 3 is 2 Mb/8 and has a configuration of 32 time blocks per frame, and the audio time slot is a digital signal string of 30 time blocks. This audio signal sequence is 301 AI, A2° As---Aso, and 302 no Bl, B2, B5-B50f in Figure 3.
), however, the combination of audio signal strings for outside lines and extension lines is done in order to simplify the circuit configuration (AI).

Bt), (A2, Bjri...(AIII
, 13m). On the other hand, it is assumed that the operator line is connected to an arbitrary channel Cn. In addition, the time slots for outside lines, internal lines, and operator lines are 30 in Figure 3.
The signals are arranged in order as shown in FIG. 4 and sent to the digital multiplex signal way 241 in FIG. 250 is 128
This is a call bus memory that holds time points, and is a sequential writing/random reading memory.

Data for random reading is generated as a control order by an exchange program in a central controller (not shown) and stored in control memory 251 via register 252.

The time slot array 410 in FIG.
) are arranged in a series of four time slots. 41
After passing through the expansion of 1 and the attenuator of 12, the gate circuit 41
2゜413 and delay circuits 421 and 422, the signal train (τo delay, Ax, Bm, Cn,
(ro delay, Bm, Cn.

τ0 delay, τ0 delay), (τ0 delay, τ0 delay, to delay, Arm.

τC delay) is added by the adder 430, and the signal sequence (
rg delay, Ax +8m, Bsm +Crx,
Cn + Am, Xt). Compress this subpath 4
31 to demodulate the original PCM code string and send it to the call path memory 27.
Write to 0 sequentially. At this point, change the beginning (Al
1llfoJi ivy is skiraged to become l -) Bm). In the case of a three-party call, the readout from the call path memory 270 is for the handler Cm (external line signal At + P3 bundled signal Bl), for the external line ASK (extension signal B1 + operator signal Cm), and for the external line ASK (external line signal A1 + operator signal Cm). It is sent out in correspondence with each extension BIK. In addition, in the case of Yasutaka Gaimon (extension signal B1+
Instead of the operator signal Cm), a no-call tone Xt is sent corresponding to the outside line AIK. If the handler disconnects while the extension is on hold or call monitoring, the call-free tone X1 is transmitted to extension B1 and handler CmK.
Send accordingly.

By having the above functions, it is possible to realize the operator trunk function equivalent to that of a conventional DIG automatic exchange.

Next, the software order for operating this function will be explained. Figure 5 (inside @) is an operational diagram (Carnot map) of the operator trunk of a conventional DIG automatic switchboard, and (c) is the original -
FIG. 2 is an explanatory diagram showing an example of a soft order for a digitization operator trunk used in the present invention.

First, FIG. 5(6) will be explained. Status @0 means that the trunk is not in use and is empty, that is, a three-way call is being made between the outside line, the extension line, and the operator. State 1 is a state in which the extension is on hold and the handler is talking to the outside line or the handler is receiving digits sent from the outside line. In state 82, the outside line is on hold and the extension line and the operator are talking.

State II3 is a state in which the outside line is put on hold and numbers are being sent from the operator to the exchange, or an interrupt connection has been made.

In a conventional operator trunk, there are two relays, S and T. If relay S is activated (denoted as Sap in the diagram), states 1 and 3 are possible, and relay T is activated (denoted as Top in the diagram). ) then state! lI2 and 3 are possible, so if both relays S and T are inactive, state 0, and if relay S is active and relay T is inactive, state 111,
If relay 8 is inactive and relay T is active, then state 2 exists, and if both relays 8 and T are active, state II! It had the ability to realize 3.

Digitization operator trunk 15G used in the present invention
However, it must also have at least the same functionality as a conventional trunk. This is shown in Figure 5 (c).
Explain with reference to. That is, 501 is an order for specifying the operation of a handler trunk in accordance with the prisoner's Karnaugh map, and 5o2 is an order for operating a so-called string circuit for connecting an outside line and an extension line to an arbitrary handler. 50
For 1, the order 0.1 consists of 3 bits. Among T and 8, T and 8 have meaning. In other words, both T and 8 are J! If it is 0, then by specifying each time slot (1 to 30) on the digitization handler link 1500A and the output side, a prisoner-like lIO can be realized, where T is logic O and S is logic 33.
If it is 1, the prisoner's state ill can be realized in the same way, if T is logic 1 and 8 is logic 0, state I12 can be realized, and if T and 8 are both logic 1, state 1113 can be realized. .

And 0. An order 501 consisting of T, 803 bits is set in the control data reception register 252 of the second WA from a processor (not shown).

The direct function of this order 501 is to specify the 41st time slot of the 4th g by specifying the 30th time slot for voice on the extension and outside lines.
This is to read out a signal string of 0 (Am, Cn, x).

Order 502 consists of 3 bits consisting of O, T, and S.
0 is logical 0. T and 8 are in the logical 10 order and are set in the control data reception register 272 in FIG. 2 by a processor (not shown). As already explained, this order 502 is stored in the general K from the call path memory 270 in FIG.
(This is an order to connect AsAs-1-f3 to Cm. In other words, one operator monitors multiple trunks on the exchange side, and no matter which trunk receives a call,
The operator can know this by the lamp display, and can connect it to the trunk there. The role of order 502 is to do the same thing. In other words, it can be said to play the role of a string circuit.

In addition, (Bm-1-Cn)-+Am, (Cm+n!
l) →Bm is performed from K where the order of 501 is interpreted by the register 252 in FIG. 2 and the time slot position is written into the speech bus control memory 271.

By using the above-mentioned soft order, the present invention can provide the same service as the conventional office group telephone system.

As explained above, compared to the conventional electromagnetic relay shadow operator trunk, the digital operator trunk used in the present invention is
・In addition to being compact due to high multiplex usage, there is no need to embed digital-to-analog conversion because digital signals are processed as they are.Therefore, the office group telephone device according to the present invention has the advantage that there is no deterioration in call quality. There is.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram showing one embodiment of the present invention, ll! ,
FIG. 2 is a block diagram showing an example of the configuration of a digitized user trunk used in the present invention, FIG. 3 is an explanatory diagram showing an example of the frame configuration of a digital multiplexed signal, and FIG. 4 shows details of the signal synthesis circuit in FIG. 2. FIG. 5 is a circuit diagram showing the signal arrangement on the call path memory, FIG. 5 is an operational diagram of the operator trunk of the DIO automatic exchange, and FIG. ,
It is. Description of symbols 110...Concentration stage communication path, 111, 112...Telephone equipment, 113, 114...Subscriber line, 115...Digital multiple signal highway in communication path, 120...Distribution stage communication path , 125... Toll line digital multiple signal highway, 126... Digital signal processing trunk,
135, 145, 155...Digital multiple signal highway, 150...Digitization operator totsu/ri, 14
0...Digital-to-analog converter (eodec) 1
70... Seat device, 171... Lamp control circuit, 17
2... Telephone key information receiving circuit, 181... Operator handset, 182... Incoming call display lamp 1.183... Operator response telephone key, 221.222, 223... Digitization to operator trunk Incoming line, 231,232,233・
...outgoing line from the digital operator trunk, (221-
IL (222-1), (223-1)...Digital multiplex signal receiving circuit, (221-2), (222-2
), (223-2)...Digital multiplex signal transmission 11
road, 240... counter, 241... digital multiple signal highway in digital handler trunk, 250,
270... Call path memory, 251, 271... Call path control memory, 252, 272... Register,
261, 262...Digital operator-trunk digital multiplex signal highway, 260...Signal synthesis circuit, 301, 302° 303...Incoming line to digital operator trunk) 1 way frame configuration, 304.・・・
Digital multiplex signal in digital handler trunk, way frame configuration, 401, 402, 403, 404
. . . Time slot of each incoming line to the digital operator trunk), 410 . . . Read signal sequence from speech path memory, 411 . . . Circuit that expands the PCM signal and attenuates it to 1/2. , 412, 413...gate circuit, 421°422...delay circuit, 430...
Adder, 431...Compression circuit, 420...Gate timing, 501...Operation control order for digital operator trunk, 502...Connection order between digital operator trunk and operator 17-1st page Continued ■Applicant NEC Corporation 5-33-1 Shiba, Minato-ku, Tokyo @ Applicant Hitachi Ltd. 5-1 Marunouchi-chome, Chiyoda-ku, Tokyo 1-7-12 Toranomon, Minato-ku, Tokyo No. ■Applicant Fujitsu Ltd. 1015-298 Kamiodanaka, Nakahara-ku, Kawasaki City

Claims (1)

[Claims] l) In digital subscriber line systems, voice time slots from external lines, voice time from internal lines
The voice time slot from the AIL and the silent time slot are held in a first call path memory, and the time slots to be processed are sequentially read out in chronological order according to the contents of the first call path control memory to generate a digital multiplex signal. The digital multiplexed signal train is combined with any two of the following three voice time slots: a voice time slot from an outside line, a voice time slot from an extension line, and a voice time slot from the operator. The synthesized signal is further held in a second speech path memory, and the synthesized signal is transferred to the #second speech path according to the contents of the second speech path control memory. Equipped with a digitized operator trunk that can read data from memory and control connections to external line time slots, internal line time slots, and operator time slots, allowing calls between external lines and operator, internal lines and operator calls, and external lines and internal lines. The function of the king call made by the operator is voice combined with the digital multiplexed signal □
A business office group telephone device characterized in that it is made possible by the following configuration.