JPH0530561A - Digital exchange - Google Patents

Abstract

PURPOSE:To perform stable data transmission even when an interface unit having many channels exceeding the transmission capacity of a time division multiplexed transmission line is connected. CONSTITUTION:The in formation relating to the connecting states of interface units for respective card slots is detected by one-chip microcomputers 18, 21, the allocation of plural communication channels in the time division multiplexed transmission line to the plural card slots is determined by a 16-bit microcomputer 10 based upon the detected information and the number of communication channels in the transmission line and the operation states of the interface units to be connected to respective card slots is controlled in accordance with the determination.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switching device such as a digital key telephone device and a digital private branch exchange, and more particularly, an interface unit having a number of channels exceeding the transmission capacity of a time division multiplex transmission line is connected to a card slot. Sometimes it relates to a device.

[0002]

2. Description of the Related Art In recent years, digital private branch exchanges (digital PBXs) and digital button telephone devices have been widely used for the purpose of enhancing non-telephone communication functions such as data communication and constructing a wide area network including office lines. There is. They convert analog signals into digital signals, time-division multiplex them, and then electronically control the communication path. The voice and data are integrated using a terminal device with its own digital interface such as a digital telephone. There are various merits such as enabling communication by the combined data.

By the way, the digital key telephone device is
Generally, it is provided with a control unit that integrally controls exchange control and transfer control, and a plurality of interface units.
The interface unit includes, for example, a digital telephone interface unit (PDKU) required for connection with a digital telephone, a station line unit for interfacing with an analog subscriber line, and a standard telephone unit for interfacing with a standard telephone. Then, these interface units are respectively mounted in the card slots provided on the motherboard. A card slot address for identifying the insertion position of the interface unit is given to each card slot.

Further, between the control unit and each interface unit, control signals are transmitted and received via the control data highway and voice and data signals are transmitted and received via the speech highway. One speech highway transmits a time division multiplexed signal which constitutes one frame with 32 time slots. The transmission rate of one time slot is 64 Kbps, and voice data for one channel is inserted into this one time slot. Then, when each interface unit (card) is inserted into the card slot, the control unit allocates 8 time slots per card to predetermined time positions on the speech highway. Note that 16 time slots are unconditionally assigned to the PDKU. Of these 16 time slots, 8 time slots are used as a B1 channel for voice communication, and the remaining 8 time slots are used as a B2 channel for data communication.

FIG. 6 is a diagram showing the number of time slots that can be assigned to each card in a digital key telephone system having six card slots. In the figure, each card slot has a card slot address (S
A0, SA1, SA2, SA3, SA4, SA5) are given. Speech highway # 0 is assigned to slot addresses SA0 and SA1, and slot address S
Speech highway # 1 is assigned to A2, SA3, SA4, and SA5. Then, when time slots are evenly assigned to each slot address on the speech highway, the slot addresses SA0,
There are 32/2 = 16 time slots per card in SA1, and slot addresses SA2, SA3, SA4.
It is a calculation that 32/4 = 8 time slots are assigned to each card for SA5.

FIG. 7 shows the structure of such a time slot for each slot address on the time axis.
In the figure, the transmission signals on the speech highway # 0 used by the cards with the slot addresses SA0 and SA1 are
16 time slots including B1 and B2 channels are time-division multiplexed. On the other hand, the transmission signal on the speech highway # 1 used by the cards with the slot addresses SA2, SA3, SA4, and SA5 has a configuration in which only the B1 channel having eight time slots is time-division multiplexed. That is, the slot address SA
0 and SA1 enable communication of voice and data through the B1 and B2 channels, and slot addresses SA2, SA3, SA4, and SA5 allow communication of only voice signals through the B1 channel.

[0007]

However, since 16 time slots are unconditionally assigned to the PDKU as described above, it is assumed that the PDKU is assigned to all the card slots of the slot addresses SA2, SA3, SA4, and SA5 in the speech highway # 1. When it is mounted, the output signals temporally overlap each other on the upstream speech highway, and as a result, problems such as inability to communicate and destruction of elements may occur. In order to avoid such a defect, for example, if the card slots with the slot addresses SA3 and SA5 are vacant and then the PDKU is inserted into the card slots with the slot addresses SA2 and SA4, they are inserted into the card slots with the slot addresses SA2 and SA4. Each PDKU can use 16 time slots, and the above-mentioned problems can be prevented. However, since such a setting must be manually performed by a maintenance staff or the like according to an instruction manual or the like, an erroneous setting often occurs, often causing a problem such as communication failure. Also, the setting work was very troublesome.

Therefore, an object of the present invention is to provide a digital switching apparatus which can always set an optimum time slot and can thereby carry out stable transmission.

[0009]

A time-division multiplex transmission line having a plurality of communication channels is provided, and a plurality of card slots to which interface units are respectively connected are provided. Transmission signals of the interface units are sent to the card slots. In a digital exchange device for transmitting via the time division multiplex transmission line via a connection information detecting means for detecting information relating to the connection state of the interface unit in each card slot, a channel allocating means, and an operation state control. And means. Then, based on the information detected by the connection information detecting means and the number of communication channels of the time division multiplex transmission path, the channel allocation means allocates the plurality of communication channels of the time division multiplex transmission path to the plurality of card slots. And according to the decision of this channel allocation means,
The operation state control means controls the operation state of the interface unit connected to each of the card slots.

[0010]

As a result, according to the present invention, the type of the interface unit inserted in the card slot is determined, and based on this determination result, the total number of time slots assigned to each interface unit exceeds a predetermined number of time slots. Since it is automatically adjusted so that it does not exist, the problem of duplicated transmission signals on the speech path is eliminated.

[0011]

EXAMPLE An example of the present invention will be described below.

FIG. 1 is a circuit block diagram showing the configuration of a digital key telephone device together with its peripheral devices. In the figure, this device comprises a control unit 1, a digital telephone interface unit (PDKU) 2, a central line unit 3, and a standard telephone unit (STU) 4. Control signals are transmitted and received between the units via the control data highway 8 and voice and data signals are transmitted via the speech highway 9. Reference numeral 5 is a digital telephone, 6 is an analog subscriber line, and 7 is a standard telephone, which are connected to a digital telephone interface unit (PDKU) 2, an office line unit 3, and a standard telephone unit (STU) 4, respectively. Each of the above interface units is in the form of a card formed by mounting various circuit elements on a printed wiring board, and is detachably mounted in a plurality of card slots provided on a motherboard in the apparatus. Then, the transmission signal of each interface unit is transmitted on the speech highway 9 through the card slot. In this embodiment, there are six card slots, and slot addresses SA0 to SA5 are assigned to the respective card slots. In addition, slot addresses SA0, SA
The card mounted in 1 is transmitted by the speech highway # 0, and the cards mounted in the slot addresses SA2 to SA5 are transmitted by the speech highway # 1.

The local line unit 3 is a one-chip microcomputer 21.
, A time slot assigner (GA) 22 for designating a time slot position on the time axis, and an interface circuit 2
3 and a codec 24 for A / D and D / A conversion. In addition, the standard telephone unit 4 includes a one-chip microcomputer 21 and a time slot assigner (GA) 22.
, An interface circuit (SLIC) 25, and a codec 24. Each of the above 1-chip microcomputer 21
Is a function for reading the card slot address generated from the card slot address generation unit provided on the motherboard for each card slot and generating a control signal in which the read card slot address data is added with its own card type information. have.

The PDKU2 includes a one-chip microcomputer 18,
A ping-pong transmission LSI 19 and an interface circuit 20 are provided. The 1-chip microcomputer 18 is provided in the station line unit 3 and the standard telephone unit 4
Like the chip microcomputer 21, it reads the card slot address generated from the card slot address generator provided on the motherboard for each card slot, and outputs a control signal in which its own card type information is added to the read card slot address. To generate. The 1-chip microcomputer 18 has a function of setting the operation mode of the ping-pong transmission LSI 19 based on the determination of the control unit 1. FIG. 3 is a block diagram showing a functional configuration of the 1-chip microcomputer 18 described above. A slot address reading unit 18 for reading an address of a card slot in which a card is inserted.
a, a control data transmission unit 18b for generating and transmitting a control signal including a slot address and a card type, an address comparison unit 18c, and a frame separation unit 18d for eight circuits.
A control data receiving unit 18e for receiving a control signal coming from the 16-bit microcomputer via the downlink control data highway, a frame synthesizing unit 18f for eight circuits, and a mode setting unit for setting the operation mode of the ping-pong transmission LSI. 18g and. In the figure, PPT is the ping-pong transmission LSI 19, and the frame separating unit 18c, the frame synthesizing unit 18f, and the mode setting unit 18g are respectively D
Signals are transmitted to and received from the ping-pong transmission LSI 19 through the OUT terminal, the SEL816 terminal and the DIN terminal.

The ping-pong transmission LSI 19 is provided with a speech highway 9 according to an instruction from the one-chip microcomputer 18.
It has the function of performing the above time slot control,
As shown in FIG. 4, a ping-pong transmission circuit 19a for eight circuits
, Time slot signal generation units 19b and 19c for designating the time on the speech highway 9, and the logic circuit unit 1
9d and a 3-state buffer 19e.
The time slot signal generators 19b and 19c are
A time slot signal that is blocked is generated every eight time slots, and a continuous 16 time slot signal is generated by both. Here, the ping-pong transmission is a digital transmission method used between a key telephone main unit and a digital telephone, and two voice signals (2B) and a control signal (D) are multiplexed. Incidentally, FIG. 5 shows the input / output system of the PDKU 2 together with its peripheral devices.

The control unit 1 includes a microcomputer having a 16-bit microprocessor (hereinafter abbreviated as 16-bit microcomputer) 10 and a microcomputer having a one-chip microprocessor for controlling transmission / reception on a control data highway (hereinafter referred to as 1 11), a time switch circuit 12 for connecting a communication path, a ROM 13 and a RAM 14, a conference circuit 15, a PB receiving circuit 16, and a microcomputer bus 17 for connecting the above circuits. There is. The 16-bit microcomputer 10 includes, in addition to ordinary control means for controlling data transmission and connection between the interfaces,
A function of collecting information about the connection state of each interface unit, a function of determining the number of time slots to be assigned to each interface unit based on this information, and a time slot mode generated based on the determined number of time slots. It has a function of supplying information to each of the interface units. FIG. 2 is a block diagram showing the functional configuration thereof. The data receiving unit 10a receives a control signal coming through the uplink control data highway, the data analysis unit 10b for determining the type of received data, and the card type table. Read / write unit 10
c, a card type table 10d, an initial processing program activation unit 10e, a mode setting table / read / write unit 10f, and a data transmission frame generation unit 10g.
And a data transmission unit 10h. Next, the operation of the digital key telephone device having the above configuration will be described with reference to FIGS.

Suppose now that the slot addresses SA0 and SA are
It is assumed that the PDKU2 is inserted into each of the card slots 1, SA2 and SA4 and the reset is released. Then,
Each card slot address generator provided on the motherboard generates slot address data corresponding to each card slot. The slot address data is read by the address reading unit 18a in each PDKU and supplied to the control data transmitting unit 18b.
The control data transmitter 18b uses the slot address data as an identifier (for example, PDKU) indicating its own card type.
In this case, "01") is added to generate "slot address + card type" information. Then, this “slot address + card type” information is 1 in the control unit 1.
According to the request of the 6-bit microcomputer 10, the data is sequentially transmitted to the 16-bit microcomputer 10.

In the 16-bit microcomputer 10, the "slot address + card type" information is received by the data receiving section 10a, sorted by the data analyzing section 10b, and then supplied to the card type table / read / write section 10c. To be done. The card type table / read / write unit 10c uses the card type table 1 according to the supplied "slot address + card type" information.
The card type for each card slot (for example, "01" in the case of PDKU) is sequentially written in the card type area of 0d. For example, in this case, the slot addresses SA0, SA
"01" is written in each of the card type areas corresponding to 1, SA2 and SA4. In addition, "slot address +
It is determined that the card is not inserted in the card slot to which the “card type” information has not been transmitted. Then, in this case, "00" is written in the card type area. As a result of the distribution in the data analysis unit 10b, if the control signal is another control signal, it is not supplied to the card type table / read / write unit 10c and is separately processed.

Now, when all the card types are registered in the table 10d in this way, the initial processing program activation unit 10e is activated, which causes the slot address SA2, SA3, SA4, and SA5 to once enter 8 in the mode area. The time slot mode (= 1) is registered. On the other hand, the slot addresses SA0 and SA1 are unconditionally 16
The time slot is registered.

Next, the mode setting table read / write unit 10f reads the card types of the slot addresses SA3 and SA5 registered in the card type table 10d, and based on the result, the mode setting table read / write is performed. Part 10f is slot address SA2
And the mode registered in SA4 is reset. That is, if the card types of the slot addresses SA3 and SA5 are other than "00", the modes of the slot addresses SA2 and SA4 are left in the 8-time slot mode. In addition, each card type is "0"
If it is "0", the mode setting table read / write unit 10f rewrites the modes of the slot addresses SA2 and SA4 to the 16 time slot mode (= 0).

Here, since no card is inserted into each of the slot addresses SA3 and SA5, the card type area corresponding to the slot addresses SA3 and SA5 is "00". In this case, the mode setting table read / write unit 10f rewrites the modes of the slot addresses SA2 and SA4 to the 16 time slot mode (= 0).

On the other hand, slot addresses SA3 and SA
Assuming that a card is inserted into each of the slot Nos. 5 and 5, the card type areas corresponding to the slot addresses SA3 and SA5 are other than "00". In this case, the time slot modes of the slot addresses SA2 and SA4 are not changed, and the slot addresses SA2, SA3, SA4, S
Each A5 is determined to be an 8-time slot mode (= 1).

As described above, the slot address SA2
When each time slot mode of SA5 and SA5 is determined, the "slot address + time slot mode"
Information is transmitted from the data transmission frame generation unit 10g to the PD via the data transmission unit 10h and the downlink control data highway.
Sent to KU. Then, it is received by the control data receiving unit 18e in the PDKU and supplied to the mode setting unit 18g. The mode setting unit 18g supplies a mode switching signal to the SEL816 terminal based on the supplied time slot mode information. That is, the time slot mode information is 8
In the time slot mode, SEL816 = 1, 16
In the time slot mode, SEL816 = 0 is supplied. The ping-pong transmission LSI controls the 3-state output buffer 18d for the speech highway by gating the latter half 8 time slots of the 16 time slots based on the mode switching signal input from the SEL 816 terminal. As a result, a transmission signal of 8 time slots or 16 time slots is generated corresponding to the mode information for each slot address.

As described above, according to this embodiment, the information about the interface unit connection state relating to all the slot addresses is 16 based on the control signal generated by the 1-bit microcomputer in each interface unit inserted in the card slot. It is registered in the bit microcomputer 10. Then, when the PDKU is inserted into the card slot, it is determined whether or not the card is inserted into the card slot in which the PDKU is not inserted, based on the information regarding the connection state, and the PD
Since the number of time slots to be assigned to KU is determined,
The total number of time slots assigned to each interface unit exceeds the capacity of the transmission line, which prevents the output signals from overlapping on the upstream speech highway on the time axis. Further, even if the interface unit is erroneously set due to a mistake made by a maintenance person, there is no possibility of causing a trouble such as communication failure. Further, it is possible to simplify the setting work, which was conventionally troublesome.

The present invention is not limited to the above embodiment. For example, in the present embodiment, the case where the PDKU is inserted into the card slots having the slot addresses SA3 and SA5 has been described as an example, but this is used as the PDK in the card slots having the slot addresses SA2 and SA4, for example.
The same control can be performed when U is inserted.
Further, in the above embodiment, the PDKU is inserted into an arbitrary card slot and the time slot allocation control is performed based on the connection state of the interface units in the remaining card slots. Card slot PDKU
If dedicated, slot addresses SA3 and S3
Time slot control may be performed based on only information as to whether or not the interface unit is connected to the A5 card slot. Further, although the above embodiments have been described by taking the digital key telephone device as an example, the present invention can be applied to, for example, a digital private branch exchange. In addition, various modifications can be made to the number of card slots possessed by the device, the combination of various interface units to be connected, the device not depending on the ping-pong transmission method, the communication device to be connected, and the like without departing from the scope of the present invention. Of course,

[0026]

Since the number of time slots allocated to PDKU is variable based on the card type information inserted in the slot, the problem that the transmission signals are duplicated on the speech path is solved, and stable speech path exchange can be always performed. It is possible to provide a digital switching device.

[Brief description of drawings]

FIG. 1 is a block configuration diagram showing an example of a digital button telephone device according to an embodiment of the present invention.

FIG. 2 is a block configuration diagram for explaining the operation of a 16-bit microcomputer in the control unit.

FIG. 3 is a block configuration diagram for explaining an operation of a one-chip microcomputer in the PDKU.

FIG. 4 is a block configuration diagram for explaining an operation of a ping-pong transmission LSI in the PDKU.

FIG. 5: Digital telephone interface unit (P
The figure which shows the structure of DKU).

FIG. 6 is a diagram showing a relationship between slot addresses and the number of time slots to be assigned.

FIG. 7 is a diagram showing a time slot allocation state on the speech highway.

[Explanation of symbols]

1 ... Control unit, 2 ... Digital telephone interface unit (PDKU), 3 ... Station line unit, 4 ... Standard telephone unit (STU), 5 ... Digital button telephone, 6 ... Analog subscriber line, 7 ... Standard telephone, 8 ... Control data highway, 9 ... Speech highway, 10 ... 1
6-bit microcomputer, 10a ... Data receiving section, 10b ... Data analysis section, 10c ... Card type table / read / write section, 10d ... Card type table, 10e ... Initial processing program starting section, 10f ... Mode setting table / read / write Section, 10g ... Data transmission frame generation section, 10h ... Data transmission section, 11 ... One-chip microcomputer, 12 ... Time switch circuit, 13 ... ROM, 14 ...
RAM, 15 ... Conference circuit, 16 ... PB receiving circuit, 17 ...
Microcomputer bus, 18 ... 1-chip microcomputer, 18a ... Address reading section, 18b ... Control data transmitting section, 18c ... Address comparing section, 18d ... Frame separating section, 18e ... Control data receiving section, 18f ... Frame combining section, 18g ... Mode Setting unit, 19 ... Ping-pong transmission LSI, 19a ... Ping-pong transmission circuit, 19b, 19c ... Time slot signal generation unit, 20 ... Interface circuit, 21 ... 1-chip microcomputer, 22 ... Time slot assigner (GA), 23 ... Interface circuit , 24 ... Codec, 25 ... Interface circuit (SLIC).

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location H04Q 11/04 301 Z 8843-5K

Claims (1)

Claim: What is claimed is: 1. A time-division multiplex transmission line having a plurality of communication channels, and a plurality of card slots to which interface units are respectively connected. In a digital switching device for transmitting through a time slot multiplex transmission line through a card slot, connection information detecting means for detecting information relating to a connection state of the interface unit in each card slot, and the connection information detecting means. Channel allocation means for determining allocation of a plurality of communication channels of the time division multiplex transmission line to the plurality of card slots based on the detected information and the number of communication channels of the time division multiplex transmission line; According to the determination of the allocation means, each of the card slots Digital switching apparatus being characterized in that comprising an operation state control means for controlling the operation state of the interface unit connected to the bets.