JPS5920320B2 - trunk device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a trunk device that can provide a variety of services such as a conference call service, a call waiting service, and a reception desk service in a time division switch.

In a time-division switching system, trunk devices connected to time-division multiplexed communication paths are also generally time-division multiplexed.

FIG. 1 shows the connection state of a general trunk device. 1st
In the figure, TDNW is a time-division multiplex channel, HW is a highway with system-specific multiplicity n, and TRK is a trunk device with a single function of n/m multiplexing, where l line requires m time slots. If such trunk devices are used to provide various services such as the aforementioned conference calling service and call waiting service, the highway will be occupied at least as much as the number of types of trunk devices necessary to provide the services. . However, generally speaking, the call volume of conference call services, call waiting services, etc. is small, and the higher the highway multiplicity n, the lower the efficiency of using highways and trunk equipment becomes. In order to improve this point, multiplexers/day multiplexers MPX/DMPX are installed between the highway and the trunk equipment as shown in Figure 2, and various trunk equipment TRKl-TR having the functions necessary for providing various services are installed.
A method of connecting Km is being considered. However, although this method increases the efficiency of highway usage,
The degree of multiplicity of the trunk devices TRKl to TRKm becomes small, and there is a drawback that the inherent advantage of the time division multiplexing device, which is the reduction in cost per line due to multiple use, cannot be sufficiently achieved. The present invention has been made in order to eliminate these drawbacks, and is connected to a time-division communication path of an exchange having a time-division multiplexed communication path system, so that the voice input from the time-division communication path and the built-in or two sets of conference call circuits each having a means for selecting and outputting one of a plurality of signal tones supplied from the outside and a function of enabling a conference call between a plurality of subscribers; and the selection means. and means for selecting and outputting only one of the outputs of the two sets of conference call circuits and a signal sound supplied internally or externally. The purpose of this trunk device is to increase highway usage efficiency and provide various services without reducing the multiplicity of the trunk device, and will be described in detail below. FIG. 3 is a block diagram showing the first embodiment of the trunk device according to the present invention, in which SEL-1N is a selection circuit and a time division multiplex communication path (not shown) input to the subscriber terminal 1N. ) Time division multiplexed PCM (audio) from
, PCM-encoded silence NT, and PCM-encoded dial tone DT.

The selection operation of this selection circuit SEL-N will be explained later in the selection circuit SEL-N.
A 2-bit selection control signal S is the output of ELO. and the selection control signal S. For example, ``00'' corresponds to the value of
゛: Input terminal 1N1゛01′゛: Silent NTl゛10゛;
Dial tone DT is selected. However, the selection control signal S. If the value of is 111, none is selected. Moreover, SELO is a selection circuit, and the impulse I
The output of the control memory CTLMO, which will be described later, is controlled by the NTP and is cyclically addressed by a counter CNTO that advances at a predetermined period, or a constant value that generates a constant value "00". It has a function of selecting one of the outputs of the generation circuit K. This selection circuit S
The impulse INTP that controls ELO can be easily obtained by commonly used means, such as the signal shown in Fig. 4, which selects the output of the control memory CTLMO at high level H and generates a constant value at low level L. The selection circuit SELO is controlled to select the output of the circuit K. The control memory CTLMO is a memory whose contents can be rewritten under control from a processing device (not shown). Furthermore,
The output of the selection circuit SEL-1N is the control memory CTLMl.
output and AND gates CATE-1 and GATE-
The conference call circuit CF, which will be described later, is logically ANDed by 2.
Supply/non-supply to O and CFL is controlled. That is, the output of the selection circuit SEL-IN is the control memory CTL.
Corresponding to the output of Ml, "00"; not supplied to any conference call circuit; "0bi; to conference call circuit CFO;"
10゛; To conference call circuit CFl, "l biconference call circuit C
It is controlled like FO&CFl.

The control memory CTLMl here is cyclically addressed and read by a counter CNTl that increments at a predetermined period, and its stored contents can be rewritten under control from a processing device (not shown). . In addition, the conference call circuits CFO and CFL each have a conference call function within a plurality of predetermined evening slots, and their specific configuration is as follows:
A so-called N-1 addition system conference call circuit that sequentially adds and stores M audio data for a predetermined time slot, subtracts the PCM audio data of the corresponding time slot from the addition result, and outputs the result to the corresponding time slot, or Various configurations are available, such as a so-called 0iceSwitch conference call circuit that selects the highest level of PCM audio data corresponding to each time slot and sends it to other time slots, and transmits silence to the time slot with the highest level. However, the present invention is not limited to a specific configuration as long as it is a conference call circuit that can perform conference calls between a plurality of time slots. SEL-0UT is a selection circuit, which is controlled by a 2-bit selection control signal S2 which is the output of the control memory CTLM2.
Corresponding to the value, '00': silent NTl '0F': output of the conference call circuit CFO, and '10': output of the conference call circuit CFl are selected. However, the value of selection control signal S2 is ``1''
In the case of 1, neither is selected. Above control memory C
TLM2 is a counter CNT that increments at a predetermined period.
2, and the stored contents can be rewritten under control from a processing device (not shown).

In addition, the output of the selection circuit SEL-0UT is sent to a shift register SROU having the required number of stages in order to adjust the timing.
The signal is sent from the output terminal 0UT via T to a time division communication path (not shown). In addition, in the above, each counter CNTO
Although counters 2 to 2 are arranged independently, no problem occurs even if l counters are arranged in common and used in common.

The operation of the trunk device shown in FIG. 3 having the above configuration will first be described in the case of a call waiting service.

Here, the call waiting service is a service that is applied when subscriber A receives a call from subscriber X while subscriber A and subscriber B are talking. This service refers to a service in which, in response to subscriber A's hooking operation, a signal including audio 6, 8, 5, or silence (indicated by diagonal lines) is sent to each subscriber, as shown in FIG. 5, for example.

This will be explained below. That is, in FIG. 5, in a two-party conversation state (phase 0) between subscribers A and B, a call is made from subscriber X to subscriber A.
When a call arrives at subscriber A for a certain period of time (phase l),
Then, a continuous ring back tone CRBTl is sent to subscriber B with silence (shown in perspective in FIG. 5).

Next, after a certain period of time, until subscriber A performs the first hooking (phase 2), for example, subscriber A receives a dial tone for a period corresponding to the high level H of the interpulse INTP shown in FIG. Silence is sent to DTl subscriber B at regular intervals. This phase 1 and phase 2
At this point, the ring back tone is continuously sent to subscriber X. When subscriber A performs the first hooking in the above state, the control memory CTLO to
2, the voice 8 of subscriber X is transmitted to subscriber A, the voice 6 of subscriber A is transmitted to subscriber X, and the hold tone HST is transmitted to subscriber B.

After this, when subscriber A performs the second footing,
Until the third footing (Phase 4)
, the processing device controls the control memory CTLMO-2, and sends the voice 8 of subscriber B to subscriber A, the voice 3 of subscriber A to subscriber B, and the hold tone HST to subscriber X. Then, when subscriber A hooks up for the third time or later, the states of phases 3 and 4 are repeated under the control of the control memory CTLMO-2 of the processing device, and the call waiting service can be received. FIG. 6 is an explanatory diagram that expresses the connection state of each subscriber corresponding to Phases O to Phase 4 and the trunk device according to the present invention in a space-divided manner, where TRK is the trunk device according to the present invention, and CRBT is a continuous ring. RBT is a tone trunk for sending back tones, RBT is a tone trunk for sending ring back tones, HST is a tone trunk for sending hold tones, and A, B, and X are subscribers. In addition, the four terminals 0 to 0 of the trunk device TRK
3 expresses the time slot and does not differentiate between participants. Further, FIG. 7 shows the settings of terminals 0-3 and three control memories CTLMO-2 for phases 1-4.

In Phase O, the trunk device TRK shown in FIG. 6 is not used and is not shown, and "Dc" indicates that it is not directly related to the operation and may be in any state. From the above explanation and FIGS. 5, 6, and 7, the operation of the trunk device TRK according to the present invention when performing a call waiting service can be easily understood.

Furthermore, the operation when performing a conference call service using the rank device according to the present invention is based on a space-division representation of the connection state between the subscribers 1A-1D participating in a conference call and the trunk device TRK according to the present invention. The control memory CTLMO shown in FIG. 8 and FIG. 3 when performing a conference call service.
This can be understood from FIG. 9, which shows the settings of steps 2 to 2.

In addition, it can also be used as a register center truck that requires directional connection in a centre, or as a reception desk trunk that requires a call splitting function.

As explained above, in the embodiment, three types of voice including signal tone input from the time-division communication path, dial tone, and silence are input.
Do you control one of the two? Select and output based on information, and
The control information is, for example, an interpulse I as shown in FIG.
Since it is created using NTP, the processing device is the control memory CT.
By simply setting the contents written in LMO, it is possible to switch the audio or signal tone as in phase 2 in Figure 5, and by rewriting the contents of the control memory CTLMO, the signal tone from the input terminal can be switched continuously. It has the advantage that it can be supplied to the conference call circuit.

Furthermore, it has two sets of conference call circuits, and only one of the selective input to these, the output of the conference call circuit, and silence can be selected and output, so that it can be used for call waiting service, conference call service, etc. etc. can be realized with the same configuration. As described in detail above, the present invention includes a means for selectively outputting one of the voice and a plurality of other signal tones input from the time-sharing communication path, and supplying/disabling the output to two sets of conference call circuits. A configuration that has means for controlling the supply, and means for selecting one of the outputs of the two sets of conference call circuits and other signal tones and outputting it to the time division call path, and can control each selection means and control means. Therefore, it has the advantage of being able to realize any combination of voices or signal tones, and since it can perform various functions with the same configuration, it is an excellent product that can be used as a conference call trunk of a telephone exchange, a call waiting service trunk, etc. The effect can be expected.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram for explaining the connection state of a general trunk device in a time division switch, FIG. 2 is an explanatory diagram of the connection state of other trunk devices, and FIG. 3 is an explanatory diagram of the connection state of a trunk device according to the present invention. FIG. 4 is a block diagram showing the implementation method, FIG. 4 is a diagram showing an example of the interpulse INTP in FIG. 3, FIG.
Fig. 6 is an explanatory diagram of the call waiting service, Fig. 7 is a diagram showing the contents of each control memory during the call waiting service, Fig. 8 is a connection diagram of the conference call service, and Fig. 9 is a conference call. FIG. 6 is a diagram showing the setting contents of each control memory at the time of service. TDNW...Time division communication path, TRK...
・Trunk device, HW...Highway, MPX
/DMPX...Multiplexer/Day multiplexer, SELO, SEL-IN, SEL-α]...
・Selection circuit, CTLMO~2...control memory,
CNTO~2... Counter, GATE-1, G
ATE-2...Andogame L-circuit, CFO, CF
l... Conference call circuit, TRK... Trunk,
CRBT, RBT...Tone trunk.

Claims (1)

[Scope of Claims] 1. In a trunk device that is connected to a time-division call path of an exchange having a time-division multiplexed call path system and can provide a conference call service, a call waiting service, and a reception desk service, a time-division call The signal including the audio input through the channel and one of a plurality of other signals internally supplied or supplied from the outside are selected and output under control based on a command from a processing device that manages exchange control. a first means to do so, and a second means having a function of enabling conference calls between a plurality of subscribers;
a second means for controlling supply of the signal selected by the first means to the two sets of conference call circuits by control based on a command from the processing device; third means for selecting and outputting one of the signals from the two sets of conference call circuits and other signals built in or supplied from the outside under control based on a command from the processing device; A trunk device comprising: 2. In the trunk device according to claim 1, the plurality of other signals internally provided in the first means or supplied from the outside are dial tone and silence;
A trunk device characterized in that other signals contained in the means or supplied from the outside are silenced.