JP2000092532A - Exchange device and isdn interface unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to use an exchange device independently of the system of a line to be used. SOLUTION: A key telephone system 10 has a function for superposing a specific bit pattern to a channel B and sending the bit pattern at the idle time of a digital line. A time switch 32 extracts an idle pattern 52 from an idle channel in an ISDN network under the control of a CPU 30 and superposes the idle pattern 52 to an idle channel B in an output data stream 41 to send it.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switching apparatus suitable for a key telephone apparatus having a function of transmitting a specific bit pattern on a B channel when a digital line is idle.

[0002]

FIG. 3 shows a conventional key telephone apparatus 100. The flow of B channel data in a digital interface in the key telephone apparatus 100 is represented by ISDN (In).
(Integrated Services Digital Network) The line interface unit 140 is shown as an example.

The key telephone apparatus 100 includes a PCM
System control unit 1 that manages data exchange functions and call processing
10 and an ISDN line interface unit 140 serving as an interface for various lines such as the ISDN network 105.
Are provided, and the data highway 120 and the PCM
It is connected to the highway 130.

[0004] ISDN line interface unit 1
40 includes a tone ROM unit 150 and a time switch unit 1
60, a line / internal bus interface unit 170, and a CPU unit 180 are provided.

The system control unit 110 and the ISDN line interface unit 140 (the time switch 16
0), the PCM highway 1
30.

Taking downlink data as an example, B-channel data is input from the PCM highway 130 to the time switch section 160 of the ISDN line interface unit section 140, where it is switched to an appropriate time slot in a frame, and / Internal bus interface unit 1
70 is input. The operation of the time switch unit 160 is controlled by a CPU unit 180 that operates based on a command from the system control unit 110.

Line / internal bus interface section 170
Converts the downlink data received from the time switch unit 160 into an appropriate format, and
Output to

When the line is not in use, a specific idle pattern conforming to the standard of the ISDN network 105 is transmitted to an idle B channel in order to perform stable communication through the ISDN network 105. You. For example, in the case of the United States, a pattern represented by “01111110” is recommended. “1” becomes a pulse as a transmission waveform, and when synchronizing (bit synchronizing) between the network and the terminal as in ISDN, the more pulses, the more accurate the synchronization.

For this purpose, the ISDN line interface unit 140 is provided with a tone ROM 150 for generating a bit pattern in hardware and supplying the bit pattern to the time switch 160. Time switch unit 1
When the line is not used, 60 transmits the bit pattern generated by the tone ROM unit 150 as a B channel idle pattern.

FIG. 4 shows a sequence at the time of an incoming call. In the case of an incoming call, first, a SET UP message (A) indicating a request for call setting is sent from the ISDN network 105 to the key telephone apparatus 100.

On the other hand, the key telephone apparatus 100 is
The call setting process is responded with a CALL PROC message (B), and when it becomes possible to receive a call, an ALERT message (C) is transmitted.

When the line is not used, as described above,
The idle pattern is put on the B channel by the time switch unit 160. At this time, for the first time, the system control unit 110 instructs the ISDN line interface unit unit 140 to connect the data (voice) channel to the B channel. Sent. In addition, after the exchange of the CONN message (D) and the CONN ACK message (E), the call (F) on the B channel becomes possible by the incoming call response.

FIG. 5 shows a sequence at the time of transmission. In the case of calling, the key telephone apparatus 100 transmits a SET UP message (G) indicating a request for call setting to the ISDN network 105.

On the other hand, the ISDN network 105 responds to the call setup processing with a CALL PROC message (H), and transmits an ALERT message (I) when the call can be transmitted.

When the line is not used, as described above,
An idle pattern is placed on the B channel. The key telephone apparatus 100 receives the ALER from the ISDN 105.
Upon receiving the T message (I), the system control unit 11
From 0, an instruction is sent to the ISDN line interface unit 140 to connect the data (voice) channel to the B channel. In addition, the transmission response
After the exchange of the NN message (J) and the CONN ACK message (K), a call (L) on the B channel becomes possible.

[0016]

As described above, in the conventional key telephone apparatus 100, when the idle B channel is used,
A specific idle pattern according to the standard of the SDN network 105 is loaded, and for this purpose, a tone ROM unit 150 for generating a bit pattern representing the idle pattern is provided. That is, the idle pattern used in the conventional key telephone apparatus 100 is based on the IS to be used.
It is fixed to only one corresponding to the standard of the DN network 105.

For example, a line in Japan or the United States using μ-low (μ-law coding) and an A-low
There are lines in other countries such as the United Kingdom that use (A-law encoding), and the key telephone apparatus 100 has a tone ROM that generates a specific idle pattern depending on which line is used. The unit 150 was mounted. Therefore, the conventional key telephone apparatus 100 is used only in a specific type of line.

On the other hand, if the key telephone apparatus 100 can be used on any line regardless of the type of the line, a specific idle pattern corresponding to each of the various types of lines to be used is set. Must be able to send.

That is, a plurality of types of idle patterns can be generated from the key telephone apparatus 100.
It had to deal with hardware such as mounting multiple tone ROM units. In this case, there arises a problem that the cost required for the components constituting the key telephone apparatus 100 increases.

Further, even if a plurality of types of idle patterns can be generated, they cannot be used on a line using an idle pattern that cannot be generated by the tone ROM unit 150 mounted on the key telephone apparatus 100, and If the standard is changed, it cannot be used and cannot be used. SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a switching device that can be used regardless of the type of line used.

[0021]

SUMMARY OF THE INVENTION The present invention relates to a key telephone apparatus having a function of transmitting a specific bit pattern on a B channel when a digital line is idle.
Extraction means for extracting an idle pattern from the idle channel of the digital line, and transmission means for transmitting the idle pattern extracted by the extraction means on the B channel of the digital line at idle. And

Thus, the digital line (ISDN)
The idle pattern of the B channel is extracted from the network, and the extracted idle pattern is put on the corresponding channel, so that the idle pattern matching the line type can be provided without providing a function (tone ROM unit) for generating the idle pattern. Can be sent.

[0023]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a system configuration of a digital line interface in a key telephone apparatus according to the present embodiment.

The key telephone apparatus 10 is connected to an exchange 14 of the ISDN 12 and communicates with the outside through the exchange 14 through the ISDN 12. ISDN
The exchange 14 of the network 12 sets the I channel
A specific idle pattern according to the standard of the SDN network 12 is transmitted.

The key telephone apparatus 10 according to the present embodiment includes a configuration in which a system control unit 20 and an ISDN line interface unit unit 26 (ISDN interface unit) are connected by a data highway 22 and a PCM highway 24. .

The system control unit 20 controls the key telephone device 1
0, and controls the PCM data exchange function and call processing.
It controls the CPU unit 30 in the SDN line interface unit unit 26, and controls the ISN through the PCM highway 24.
The transmission and reception of data including the B channel is performed with the DN line interface unit 26.

ISDN line interface unit 2
Reference numeral 6 denotes an interface for various lines such as the ISDN network 12 and includes a CPU 30, a time switch 32, and a line / internal bus interface 34.

The CPU section 30 controls the operation of the time switch section 32 under the system control section 20. The CPU section 30 has a function of extracting an idle pattern from an idle channel of the digital line, and a function of extracting B when the digital line is idle. A function of transmitting an idle pattern on a channel is realized.

The time switch section 32 manages, under the control of the CPU section 30, the input and output of a frame composed of, for example, 32 time slots (one time slot is 8 bits). The time switch unit 32 transmits a specific idle pattern according to the standard of the ISDN network 12 on the B channel when the line is idle.

Line / internal bus interface unit 34
Is the ISDN network 12 and the internal bus (time switch unit 3
2), the line / internal bus interface transmitting unit 34a and the line / internal bus interface receiving unit 34b perform data format exchange and the like.

FIG. 2 shows the time switch unit 3 shown in FIG.
2 is a block diagram showing a detailed configuration of FIG. As shown in FIG. 2, the time switch unit 32 includes an input buffer 32a for storing data input via the line / internal bus interface unit 34, and the ISDN network 12 via the line / internal bus interface unit 34. An output buffer 32b for storing data to be output is provided.

Next, the operation of this embodiment will be described. The incoming call sequence and the operation of the incoming call sequence of the key telephone apparatus shown in FIG. 1 are performed as shown in FIGS. 4 and 5 used in the above description.

First, the input data stream 40 received from the ISDN 12 is sent to the line / internal bus interface receiving section 3 of the line / internal bus interface section 34.
The signal is input to the time switch unit 32 via the switch 4b.

In the ISDN network, a plurality of B channels (for example, two channels B1 and B2) and a D channel (data) are multiplexed. The location of the idle channel in the stream 40 can be recognized from the plurality of B channels through the line / internal bus interface unit 34 or the system control unit 20 based on the contents of the D channel.

The CPU section 30 uses the time switch section 32 to return the idle pattern of the idle channel extracted from the input data stream 40 to the idle B channel in the output data stream to the ISDN network 12 and return it. Send out.

Here, a mechanism for putting an idle pattern on the B2 channel will be described with reference to a diagram mainly showing the time switch unit 32 in FIG. Data received by the line / internal bus interface receiver 34b is on the input data stream 40.

The CPU section 30 has a function of input data stream 4
It recognizes that the received data 50 of the B2 channel on 0 is bit data representing an idle pattern. Also, C
The PU unit 30 recognizes that the idle pattern extracted from the reception data 50 of the B2 channel should be transmitted as the transmission data of the B2 channel in the output data stream 41.

The CPU section 30 controls the time switch section 32 to put the bit pattern of the B2 channel stored in the input buffer 32a on the B2 channel of the output buffer 32b.

The data stored in the output buffer 32b is output from the time switch unit 32 to the output data stream 4
1 and the idle pattern 52 extracted from the input data stream 40 is placed on the B2 channel, and the line / internal bus interface transmitting unit 34
a is sent to the ISDN network 12 via the a.

In this manner, the keypad telephone device 10
In the SDN line interface unit 26, the ISD
An idle pattern of the B channel corresponding to the system (standard) of the line in which the N network 12 (switch 14) is generated can be extracted and sent back on the idle B channel in the output data stream 41 for transmission. .

Accordingly, the key telephone apparatus 10 can be used without any restrictions without corresponding to the line system (standard) using the key telephone apparatus 10 in terms of hardware. Will be improved. The user can use the key telephone apparatus 10 without worrying about the method of the ISDN 12 (the attribute of the idle pattern).

[0042]

As described in detail above, according to the present invention, B
A channel idle pattern is extracted from a line, and the idle pattern in the output data stream is transmitted on the B channel to which the idle pattern is to be transmitted, so that the idle pattern can be transmitted by returning the idle pattern. Therefore, it can be used regardless of the type of line used.

[Brief description of the drawings]

FIG. 1 is an exemplary block diagram showing a system configuration of a digital line interface in a key telephone apparatus according to an embodiment;

FIG. 2 is a block diagram showing a detailed configuration for explaining an operation of a time switch unit 32 shown in FIG. 1;

FIG. 3 is a diagram showing a configuration of a conventional key telephone device 100.

FIG. 4 is a diagram showing a sequence at the time of an incoming call using an ISDN network.

FIG. 5 is a diagram showing a sequence at the time of calling using an ISDN network.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Button telephone apparatus 12 ... ISDN network 14 ... Exchange 20 ... System control part 22 ... Data highway 24 ... PCM highway 26 ... ISDN network interface unit part 30 ... CPU part 32 ... Time switch part 32a ... Input buffer 32b ... Output buffer 32c ... Connection memory 34 ... Line / internal bus interface unit 34a ... Line / internal bus interface transmitting unit 34b ... Line / internal bus interface receiving unit

Continued on the front page F term (reference) 5K030 GA11 HA01 HC05 JA13 JL08 KA14 5K049 AA10 BB02 BB05 BB24 FF00 FF01 5K050 AA08 BB03 BB06 BB14 CC09 EE34 GG10 GG11 5K051 AA04 CC04 DD03 HH11 HH26

Claims (2)

[Claims] 1. An exchange having a function of placing a specific bit pattern on a B channel of a digital line when the channel is idle and transmitting the bit pattern, comprising: an extracting unit for extracting an idle pattern from an idle channel of the digital line; A switching unit for transmitting the idle pattern extracted by the extracting unit on the B channel at the time of idle; 2. An ISDN interface unit having a function of transmitting a specific bit pattern on a B channel of a digital line when the channel is idle, and extracting the idle pattern from the idle channel of the digital line. Transmission means for transmitting the idle pattern extracted by the extraction means on the B channel at the time of idle.
N interface unit.