JP2616692B2 - ISDN exchange - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ISDN exchange which performs an exchange operation on an ISDN basic interface.

[0002]

2. Description of the Related Art The basic interface of ISDN is a B channel 2 having a transmission capacity of 64 kbps used for transmitting and receiving information.
And a transmission capacity of 16 kbp used for transmitting and receiving call control signals.
This is an interface for 2B + D digital communication composed of s D channels. Also, terminals connected to the ISDN basic interface will communicate using one of the B channels, and the basic interface 1
It is possible to mount up to two terminals for one.

In the conventional ISDN exchange, a terminal is mounted on one of the two B channels of the basic interface, and when the terminal is communicating, a third party can use the same basic interface (the same telephone number). )
When a call is made to the terminal, the remaining channels on which the terminal is not mounted are captured. At that time, the ISDN exchange recognizes that the terminal is not mounted on the B channel, and connects a talkie trunk for notifying the third caller that the terminal is not mounted on the telephone number.

[0004]

The above-mentioned conventional ISD
In the N exchange, if a third party calls the basic interface while the B channel of the basic interface is communicating and the other B channel is not in a terminal mounted state, the telephone number is correct. since flows talkie terminals unimplemented, whether was subjected mistakes telephone number, the terminating subscriber is not possible to distinguish whether it is communicating.

[0005] Also, a representative service of ISDN in which the same telephone number is assigned to a plurality of basic interfaces is a terminal unrealized service.
When coming into B channel of instrumentation, B channels of other base interface that formed a representative (despite the presence of free terminal) in the free state would connect talkie terminals unimplemented. Note that 2 for one B channel
One terminal can be implemented.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an ISDN exchange capable of discriminating a wrong telephone number from a destination subscriber's communication. In this case, "
"No" means no subscribers, ie both B channels
Compatible with basic interface without terminal installed
It means dialing a telephone number. Also this place
One of the B channels communicates with "Destination subscriber communication"
Inside, the other B channel means the terminal is not mounted
You.

[0007]

According to the ISDN exchange of the present invention, any one of "terminal non- mounted state", "communicating state", and "empty state", which are the states of two B channels of the ISDN basic interface, respectively. And a basic interface state based on the states of the two B-channels stored in the B-channel state storage unit. state ", both of the B channel is" not real
And when the time of the devices are "" unmounted state ", both B channels are the" communication state ", when one of the B channels and the other B-channel in the" communication state "is" unmounted state "," communication A logical operation unit that determines a "medium state", and a control unit that connects a sound source corresponding to each of the determined basic interface state to the line when the determined state of the basic interface is "communicating" or "terminal not mounted state" And

[0008]

When one of the B channels of the basic interface is communicating and the other B channel is not mounted on the terminal, the state of the basic interface becomes communication. When called, it is possible to identify that the called subscriber is communicating. Further, while the state of the B channel terminal not implemented the basic interface, when the other B-channel is idle, since the state of the basic interface becomes a free state, that would connect talkie terminals unimplemented Absent.

[0009]

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

FIG. 1 is a block diagram of an ISDN exchange according to an embodiment of the present invention.

The ISDN exchange of this embodiment comprises a B-channel state storage unit 1, a logical operation unit 2, a call control unit 3, a line control unit 4, a sound source control unit 5, a B channel 6, and a sound source 7.

As shown in Table 1, the B channel state storage unit 1 has a 2-bit configuration for each of the two B channels B ₁ and B ₂ , and the combination of bit 1 and bit 2 is 11. .. Means the physical state of the B channel, that is, empty (terminal is present), 10 is communicating (terminal is present), and 00 is not mounted . The B channel state storage unit 1 of FIG. 1 holds the bit information of Table 1 for the basic interface.

[0013]

[Table 1] The logical operation unit 2 calculates the logical sum of each bit of the _two B channels B ₁ and B ₂ held in the B channel state storage unit 1 and determines the state of the basic interface (“empty”, “communicating”, “communication”). Terminal unmounted state) is determined, and the result is returned to the line control unit 4. FIG. 2 shows an example of the logical operation of the logical operation unit 2.

In FIG. 2, two B channels B ₁ and B ₂
Are B ₁ ... 10 (during communication) and B _2.
00 (terminal not implemented ), the result of the logical sum of each bit indicates that the state as the basic interface is 10
(During communication). That is, one B channel is communicating and the other B channel is not
In the case of the mounted state, since the basic interface is “communicating”, the line control unit 4 determines that the “communicating” sound source should be connected instead of the “terminal not mounted ” sound source. Therefore, the above problem can be solved. That is, by taking the two logical sum of each bit of the B-channel B _1, B _2, as long as the B-channel B _1, B ₂ is not both the terminal unmounted state, not a terminal non-mounting state as the basic interface.

Table 2 shows two B channels B ₁ and B ₂
7 shows the operation results of the states of all the basic interfaces that can be considered by the bit pattern of FIG.

[0016]

[Table 2] When a call is generated and a call acquisition request is issued from the call control unit 3, the line control unit 4 accesses the logical operation unit 2 and sets the state of the two B channels B ₁ and B ₂ in the B channel state storage unit 1. , The state of the basic interface determined by the logical operation unit 2 is acquired. If the state of the basic interface is “empty”, an incoming call is received on the corresponding B channel, the line is captured. Is notified to the call control unit 3, and the call control unit 3 informs the sound source control unit 5 of the sound source 7 of "communicating".
To connect. If the basic interface is
Line control unit 4 when it is not mounted state "" terminal unrealized
And notifies the instrumentation state "to the call control unit 3, and requests to connect the sound source 7 of the" terminal unmounted state "to the sound source control unit 5, the call control unit 3.

[0017]

As described above, according to the present invention, by providing the B channel state storage unit and the logical operation unit, the caller can be called during the destination subscriber communication (one B channel communication).
It is possible to provide a function that enables identification of a difference between a telephone number and a B-channel (without the other B channel) (call to a basic interface in which no terminal is mounted ).

Further, in the representative service of ISDN,
By being aware of the state of the basic interface be incoming to the B channel of the terminal unimplemented, rather than connecting to a talkie terminals unimplemented, it is possible to perform processing to select another idle B-channel to continue It becomes possible.

[Brief description of the drawings]

FIG. 1 is a block diagram of an ISDN exchange according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating an example of an operation result in which a logical operation unit 2 determines a state of a basic interface from states of _two B channels B ₁ and B ₂ .

[Explanation of symbols]

 1 B channel state storage unit 2 Logical operation unit 3 Call control unit 4 Line control unit 5 Sound source control unit 6 B channel 7 Sound source

Claims (2)

(57) [Claims] In an ISDN exchange, information corresponding to any one of a "terminal unmounted state", a "communicating state", and an "empty state", which are states of two B channels of an ISDN basic interface, is held. A B channel state storage unit, and a state of the basic interface from a state of the two B channels held in the B channel state storage unit, and an “empty state” when at least one of the B channels is idle;
When both B channels is "unmounted state""unmounted shape <br/>state", both B-channels and when the "communication state", one of the B channels and the other in the "communication state" A logical operation unit that determines the “communicating state” when the B channel is “ unmounted state”, and a sound source corresponding to each of the determined basic interface states “communicating” or “terminal not mounted state” And a control unit for connecting the line to the line.
DN exchange. Wherein said B channel state storage unit in the configuration of 2 bits Ki One each B channel, "11" is idle, "1
0 "is in the communication state," 00 "means a non-mounted state terminal, the logical operation unit takes the logical sum of the status of both channels for each bit, and the result with the state of the basic interface, according to claim 1 An ISDN exchange as described.