JPH06303659A - Broadband switching system - Google Patents

Abstract

(57) [Abstract] [Purpose] It is possible to effectively and appropriately allocate a call to a call request of a broadband call signal that simultaneously uses a plurality of call channels. [Structure] The exchange 1 comprises a channel securing means 11 and an allocating means 12. The channel securing means 11
2 which exceeds the number of available communication channels from the terminal device 3
The required number of communication channels are sequentially reserved and secured based on the call origination request using the predetermined number of communication channels. The allocating means 12 is the channel securing means 11
The predetermined number of call channels secured in step 2 is assigned to the line of the terminal device 3 that uses the predetermined number of call channels and has a call origination request.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wide band exchange system for exchanging a wide band speech signal using a plurality of speech channels at the same time.

[0002]

2. Description of the Related Art Conventionally, in a communication network system using a private branch exchange (hereinafter referred to as "PBX"), a call of one unit trunk line is made between PBXs connected by trunk lines having a plurality of call channels. Communication is performed using a channel as a call signal that uses the entire band (for example, a call signal having a data communication capacity of 64 Kbps as a call channel), or the call signal is band-compressed and multiplexed to form a plurality of units on one trunk line. Communication that forms and uses sub-channels (sub-channels), or communication that simultaneously uses multiple call channels that use the entire bandwidth of the unit trunk line (
“64 Kbps × n communication”).
In such a system having various communication modes, it is possible to arbitrarily select the communication mode depending on the type of the signal to be communicated, the purpose of use (for example, voice call, data communication, and video conference).

In such a PBX, when a plurality of band-compressed call signals are simultaneously transmitted in one unit trunk line communication path, a call channel of the entire band of the unit trunk line is required, for example, at 64 Kbps. In order to perform data communication, if communication is performed in a sub-channel of even one band-compressed call signal in a unit trunk line communication path, the entire band of the call path is Communication cannot be performed on the required communication channel, and the communication cannot be established until there is a free communication path in all bands. Also,
In such PBX, wideband high-speed communication, for example, image communication for video conference, 64 Kbps × n
The communication can be established only when n communication channels are vacant at the same time.

For example, the data communication capacity of one channel is 6
There are multiple 4 Kbps call channels, at least some of which are used for voice calls using, for example, one call channel, for example 64 Kbps × n for image and voice communication for video conferencing. When attempting to perform high-speed broadband communication that requires a number (n channels), communication such as a video conference cannot be performed unless 64 Kbps × n channels are completely free.

[0005]

Therefore, in such a system, when the traffic of the trunk line is high, it may be difficult to satisfy the above-mentioned conditions, and when high-speed wide-band communication is required, for example, When I want to start a video conference, I'm having trouble connecting to the other party. This becomes a big problem in a network that handles high-speed broadband communication and voice at the same time.

For example, 64 Kbps for a video conference
If 6 channels (64 Kbps x 6) are required for the line, even if there are 5 channels available for 64 Kbps, a call cannot be made unless the 6th channel is available.
Even if I try to hold a video conference, I get busy because the line is insufficient. Also, even if 5 channels are vacant when the first call request is made and it is busy, it is sufficient if it is possible to call as soon as 6 channels are vacant, but when the next call request is made, the number of channels becomes 4 again. I can't hang it up.
Also, there is no way to immediately know that 6 channels are available.
Therefore, in reality, there is no choice but to repeatedly make an outgoing call request.

The present invention has been made in view of the above circumstances, and it is possible to effectively and appropriately allocate a call to a call request for a broadband call signal that simultaneously uses a plurality of call channels. It is intended to provide a broadband switching system that can

[0008]

The present invention is configured as follows in order to solve the above problems and achieve the object. FIG. 1 is a principle diagram of the wideband switching system of the present invention. In the present invention,
The communication network has an exchange 1, a trunk line 2, and a terminal device 3. The exchange 1 is, for example, a PBX, a plurality of exchanges 1 are connected via a trunk line 2, and one or more terminal devices 3 are connected to each exchange 1. The relay line 2 has a plurality of call channels, and communication can be performed between each terminal device 3 using one or more call channels. Relay line 2
The plurality of communication channels may be configured by individual unit relay lines, or may be configured by a plurality of sub-channels formed on the unit relay line by multiplexing.

Each exchange 1 is provided with a channel securing means 11 and an allocating means 12. Channel securing means 1
1 sequentially reserves and secures the required number of communication channels based on a call request from the terminal device 3 using a predetermined number of communication channels of 2 or more, which exceeds the number of available communication channels. That is, when the exchange 1 receives a call request from a certain terminal device 3 and the number of call channels required for the call request exceeds the number of available call channels, the channel securing means 11 reserves to reserve the required channels. Perform processing.

The reservation processing by the channel securing means 11 typically reserves and secures a vacant speech channel, and subsequently sequentially reserves and secures the speech channels for which speech has ended. The reservation of these call channels is ensured by blocking incoming and outgoing calls of the call channels.
The reservation processing by the channel securing unit 11 may be started when the number of communication requests abandoned as busy due to insufficient number of communication channels is counted and the count value reaches a predetermined value. Even if the number of communication requests abandoned as busy due to insufficient number is counted for each terminal device 3, and the reservation process for the line of the terminal device 3 is started when the count value reaches a predetermined value. Good.

The channel securing means 11 has, for example, a trunk blocking means 102a for blocking incoming / outgoing lines to secure a line and retaining information on the secured line in order to secure the predetermined number of communication channels. May be
A counter 102c may be provided to count the number of busy times for each predetermined number or each extension terminal device in order to start the reservation process based on the number of busy times.

The allocating means 12 allocates the predetermined number of call channels secured by the channel securing means 11 to a line of the terminal device 3 which uses the predetermined number of call channels and has a call origination request. In this assigning means 12,
The predetermined number of call channels secured by the channel securing unit 11 may be allocated to the line of the terminal device 3 which first issues a call request using the same number of call channels after securing, and the predetermined number of call channels. The terminal device 3 that has issued a call request that triggers the securing of the call channel.
May be preferentially assigned to the line.

The assigning means 12 may further include a call back means 121 and an automatic calling means 122. In this case, when the predetermined number of call channels are secured by the channel securing unit 11, the allocating unit 12 causes the call back unit 121 to issue a call origination request that triggers the securing of the call channel. When there is a response from the terminal device 3 to the call back, the automatic call means 122 automatically calls and connects to the other party of the call request.

In this case, the channel securing means 11 puts the terminal device which has issued the communication request, which is busy because the number of communication channels is insufficient, into a waiting state and holds the information of the communication request. The call-back means 121 and the automatic call-out means 122 of the allocation means 12 may perform call-back and automatic call-out according to the information held in the waiting means 102b.

Here, the channel securing means 11, the allocating means 12, the recalling means 121, the automatic transmitting means 122,
The counter 102c, the trunk closing unit 102a, and the waiting unit 102b may be configured using a communication control program. At least a part of this control program may be a communication protocol.

When there is a shortage of call channels in response to an outgoing call request using a plurality of call channels, a plurality of call calls can be allocated by making an effective reservation of the call channels and appropriately allocating the call channels without simply keeping busy. Busy abandonment of outgoing requests using the channel can be reduced, improving communication reliability and efficiency.

Each call channel may include a sub-channel when unit trunk lines are multiplexed and used.

[0018]

According to the present invention, the exchange 1 receives a call request for a broadband call using a plurality of call channels from a certain terminal device 3, and the call channel number required in the call request is the number of available call channels. If it exceeds, the channel securing means 11 performs a reservation process to secure a required channel, and the allocated predetermined number of communication channels are allocated to the allocating means 1
2 is assigned to the line of the terminal device 3 that uses the predetermined number of communication channels and has a call origination request.

Therefore, the probability that a call requiring a plurality of call channels will be established without increasing the call origination request of a call requiring a plurality of call channels, and the call requiring a plurality of call channels will increase. The communication efficiency of a call that requires a channel is improved.

The wide band switching system of the present invention is suitable for a communication network system in which communication using a single communication channel and wide band high speed communication such as a video conference using a plurality of communication channels coexist.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS <First Embodiment> An embodiment of the broadband switching system according to the present invention will be described below. FIG. 2 shows the configuration of a first embodiment of an exchange system adopting the wideband exchange system according to the present invention.

In FIG. 2, the PBX 10 is composed of a network 101 and a communication control unit 102-1. One or more terminals 30 are connected to the network 101 via digital line circuits 40, respectively. The terminal 30 can make a call using n lines (64K × n) for the 64 Kbps line. Network 101
Are connected to the relay line 20 via the trunk circuit 50. The communication control device 102-1 is a trunk blocking unit 1
02a. The trunk closing means 102a substantially corresponds to a part of the channel securing means 11 shown in FIG.

The communication control unit 102-1 requests the communication from the terminal 30 to the network 101 via the digital line circuit 40 and the trunk line 50 to the network 101 via the trunk circuit 50 for the exchange process in the PBX 10. The network 101, the digital line circuit 40, the trunk circuit 50, and the like are controlled in accordance with a given communication request. Although not shown in FIG. 2, the trunk line 20 is connected to another PBX network having a similar configuration via a trunk circuit to form a communication network.

The communication control unit 102-1 has a call-out request from the terminal 30 using n lines of 64 Kbps,
If the number of available lines is less than the required number of lines n, the line is disconnected because it is busy. In this case, the communication control device 102-
In the first example, the trunk blocking unit 102a closes the trunk of the line that is vacant at that time to secure the line, and then sequentially blocks the trunk of the line that is vacant when the call ends to secure the required number of lines n. The line securing process ends. In this case, the trunk blocking means 102a holds the route number and line number of the line secured by blocking the trunk, as shown in FIG.

After the required number n of lines have been secured, the communication control device 102-1 receives a call request from the terminal 30 using the same number n of lines, ie, 64 Kbps. , Allocate the line secured by the trunk blocking means 102a. Therefore, after the required number n of lines have been secured, the call is securely established without making a call request that requires n lines. In this case, since the communication control device 102-1 monitors only the required number of lines processed busy due to the shortage of the number of lines, the same PBX1
For 0, when the terminal 30 which has been busy-processed first makes a call request requiring the same number of lines from another terminal before making a call request again, the terminal 30 allocates the call to that terminal. The call request of 30 becomes busy again, and the line securing process similar to the above is performed again.

A more specific operation of the first embodiment of the exchange system shown in FIG. 2 will be described with reference to the timing chart shown in FIG. First PBX (10)
When some communication lines are used in the trunk line between the second PBX (10) and the second PBX (10) and there are no free lines more than n lines (that is, when the number of free lines is less than n), P
6 from an originating terminal (30) coupled to the BX (10)
When there is a 4K × n call request, the number of available lines is less than n (for example, nm lines), so the first PBX is used.
It is processed as busy by (10) and the originating terminal (30)
Is disconnected. In this case, the line reservation is immediately started at the same time as the busy process, and if there is a free line at that time, the trunk blocking means (10) of the first PBX (10) is used.
By 2a), line origination / departure blocking processing is performed to reserve the line.

The first PBX (10) and the second PBX (1
When one of the communication lines used with 0) is disconnected by ending the call, that is, by terminating the call, the line is reserved and reserved by the blocking process by the trunk blocking means (102a). Next, the first PBX (10) and the second
When one of the communication lines used with the PBX (10) is disconnected and the line is disconnected, the line is reserved and reserved by the blocking process by the trunk blocking means (102a). 1 PBX (10) and 2nd
Trunk blocking means (102a) every time the telephone line used with the PBX (10) of the other is terminated and disconnected.
By the blockage processing of (1), lines are sequentially reserved and secured until n lines are secured.

In this way, when the transmission terminal (30) again makes a transmission request of 64K × n after the reservation of the n lines, the n lines have been reserved.
The line is assigned to the call request, the second PBX (10) is called according to the call request, and the second PBX (10) is called.
Call the called terminal (30) coupled to the BX (10). When there is a response from the receiving terminal (30) to the second PBX (10), the second PBX (10) transfers the first PBX (10).
From the first PBX (10) to (10), the originating terminal (3
0) is sequentially responded to, and a call is made between the calling terminal (30) and the called terminal (30).

That is, as shown in FIG. 5 (a), the first P
Relay line 2 between BX (10) and second PBX (10)
If there is 3 lines available for 0 line and all other lines are used, and there is a request for 64K × 6 transmission from the originating terminal (30), busy line processing is performed because there are not enough available lines. At the same time, the reservation process is started, and the trunk blocking means (102a) performs the departure / arrival blocking process for the three lines that are vacant at that time to secure the reservation, and FIG.
As described above, every time the line is terminated, the trunk blocking unit (102a) makes an incoming / outgoing blocking process to sequentially reserve an empty line. In this way, when the calling terminal (30) makes a call request for 64K × 6 with the line reserved for 64K × 6 in total, the reserved line is allocated as shown in FIG. 5 (c). And the call is established.

In the case of the first embodiment, the communication control unit 102-1 monitors only the number of lines processed busy due to the shortage of the number of lines, so that a plurality of terminals 30 are connected to the same PBX 10. When connected, the terminal 30 that has been busy processed first will allocate it to another terminal if there is a call request that requires the same number of lines from another terminal before making a call request again. However, in many cases this is sufficient. <Second Embodiment> FIG. 6 shows the configuration of a second embodiment of an exchange system adopting the wideband exchange system according to the present invention.

In FIG. 6, parts substantially similar to those in FIG. 2 are designated by the same reference numerals, and detailed description thereof will be omitted.
The PBX 10 includes the network 101 and the communication control device 10.
2-2 and. The communication control device 102-2 includes a waiting means 102 in addition to the trunk closing means 102a.
b. These trunk closing means 102a and waiting means 102b substantially correspond to a part of the channel securing means 11 shown in FIG. Communication control device 102-
2 is from the terminal 30 to the network 1 via the digital line circuit 40 for exchange processing in the PBX 10.
01 to control the network 101, the digital line circuit 40, the trunk circuit 50, etc. in accordance with the communication request given to the network 101 from the relay line 20 via the trunk circuit 50. Similar to the case of the first embodiment, the communication network is formed by being connected to another PBX network having the above configuration via a trunk circuit.

The communication control unit 102-2 has a call origination request from the terminal 30 using n lines of 64 Kbps,
When the number of available lines is less than the required number of lines n, the line is disconnected as busy, and when the reservation service is requested, the waiting means 102b disconnects the line as busy and is in a waiting state. The extension number and the destination number of the terminal 30 are registered as shown in FIG. Then, the trunk blocking means 102a closes the trunk of the line that is vacant at that time to secure the line, and subsequently closes the trunk of the line that is vacant at the end of the call to secure the required number n of lines. The securing process of is ended.

Then, when the required number n of lines are secured, the communication control device 102-2 issues the earliest call origination request to use n lines of 64 Kbps based on the registered contents of the waiting means 102b. When the terminal 30 is called and a response is received from the terminal 30, the line secured by the trunk blocking unit 102a is assigned to the terminal 30. Therefore, when the required number n of lines are secured, the terminal 30 that has previously issued the call request for the n lines is called back, and the call is surely established. In this case, the communication control device 1
02-2 is a terminal 30 that has been busy processed due to a shortage of lines.
Since both the number of lines and the number of lines are monitored, the secured line of the terminal 30 which was processed earliest is allocated.

A more specific operation of the second embodiment of the exchange system shown in FIG. 6 will be described with reference to the timing chart shown in FIG. First PBX (10)
When some communication lines are used in the trunk line between the second PBX (10) and the second PBX (10) and there are no free lines more than n lines (that is, when the number of free lines is less than n), P
6 from an originating terminal (30) coupled to the BX (10)
When there is a 4K × n call request, the number of available lines is less than n (for example, nm lines), so the first PBX is used.
It is processed as busy by (10) and the originating terminal (30)
Is disconnected. At this time, the first PBX (10)
Is in a state where the waiting means 102b can accept the reservation service from the calling terminal (30), and the calling terminal (3
The extension number of the calling terminal (30) and the number of the other party can be registered from 0) by the waiting registration operation of the reservation service.

In this case, the line reservation starts immediately after the completion of the waiting registration reception and the disconnection of the line of the calling terminal 30, and if there is a line available at that time, the first PBX
The trunk blocking means (102a) of (10) performs line departure / arrival blocking processing to reserve the line.

The first PBX (10) and the second PBX (1
When one of the communication lines used with 0) is disconnected by ending the call, that is, by terminating the call, the line is reserved and reserved by the blocking process by the trunk blocking means (102a). Next, the first PBX (10) and the second
When one of the communication lines used with the PBX (10) is disconnected and the line is disconnected, the line is reserved and reserved by the blocking process by the trunk blocking means (102a). 1 PBX (10) and 2nd
Trunk blocking means (102a) every time the telephone line used with the PBX (10) of the other is terminated and disconnected.
By the blockage processing of (1), lines are sequentially reserved and secured until n lines are secured.

In this way, when the reservation of the n lines is secured, the communication control device 102-2 causes the waiting means 102.
According to the registration content of b, the terminal (30) that made the earliest call request of 64K × n is called back, and when there is a response from the terminal (30), the secured n lines are assigned to the call request, Call the second PBX (10) and then the second
Call the terminating terminal (30) that is coupled to the PBX (10). From the receiving terminal (30) to the second PBX (10)
From the second PBX (10) to the first PB
A response is made to X (10), and a call is made between the calling terminal (30) and the called terminal (30).

In the case of the second embodiment, the communication control device 102-2 calls back the terminal 30 that was first processed in busy according to the registered contents of the waiting means 102b,
Since the secured lines are assigned, the secured lines are assigned in an appropriate priority order. <Third Embodiment> FIG. 9 shows the configuration of a third embodiment of an exchange system adopting the wideband exchange system according to the present invention.

In FIG. 9, portions substantially similar to those in FIG. 2 or 6 are designated by the same reference numerals, and detailed description thereof will be omitted. The PBX 10 is composed of a network 101 and a communication control device 102-3. Communication control device 102
-3 is 64K × n in addition to the trunk closing means 102a
It has a call counter 102c. The trunk blocking means 102a and the 64K × n call counter 102c substantially correspond to a part of the channel securing means 11 shown in FIG. The communication control device 102-3 requests the communication from the terminal 30 to the network 101 via the digital line circuit 40 and the communication from the trunk line 20 to the network 101 via the trunk circuit 50 for the exchange process in the PBX 10. Controlling the network 101, the digital line circuit 40, the trunk circuit 50, etc. in response to a request is the same as in the first and second embodiments.

The communication control unit 102-3 has a call origination request using n lines of 64 Kbps from the terminal 30,
When the number of available lines is less than the required number of lines n, the line is disconnected as busy and the number of times the line is disconnected as busy is indicated by the 64K × n call counter 102c in FIG.
As shown in, the number is counted for each required number of lines. This 64
When the count value of the K × n call counter 102c reaches the predetermined value q, the communication control device 102-3 starts the line reservation securing process, and the trunk blocking unit 102a opens the trunk of the line that is currently free. When the line is blocked and the line is secured, and then the trunk of the line that has been vacated by the end of the call is sequentially blocked to secure the required number of lines n, the line securing process ends.

After the required number n of lines have been secured, the communication control unit 102-3 receives a call from the terminal 30 when a call request is made using the same number n of lines of 64 Kbps. The line secured by the blocking unit 102a is assigned. Therefore, after the required number n of lines have been secured, the call is securely established without making a call request that requires n lines.

Incidentally, 64K × of the communication control device 102-3
As shown in FIG. 11, the n call counter 102c counts the number of busy times for each extension number of the terminal 30, and based on the count value for each extension number of the terminal 30 (for example, the count value is q The reservation reservation process may be started when the time reaches (1). In this case, the communication control device 10
2-3, as shown by a broken line in FIG.
It is more effective to provide b and register the extension number and the destination number of the terminal 30 in the waiting state, and to allocate it to the corresponding terminal 30 at the time when the n lines are secured. In this case, the secured line is assigned when the next call request from the terminal 30 is issued.

More specific operations in the third embodiment of the exchange system shown in FIG. 9 will be described with reference to FIGS. 12 and 13.
This will be described with reference to the timing chart shown in FIG. When some communication lines are used on the trunk line between the first PBX (10) and the second PBX (10) and there are no free lines more than n lines (that is, the number of free lines is less than n). In this case), if there is a call request of 64K × n from a certain calling terminal (30) coupled to the first PBX (10), the number of available lines is less than n (for example, nm lines). ,
It is processed as busy by the first PBX (10), and the line of the calling terminal (30) is disconnected. At this time, 64K x
The n-call counter 102c sequentially counts the number of outgoing call requests that are disconnected as busy. At this time, the first PBX (1
All terminals (30) connected to (0) may be integrated and counted for each required number of lines.
It may be possible to count each 0) individually. In this way, when the count value of the 64K × n call counter 102c reaches a predetermined value, for example, q, the reservation reservation process for the line corresponding to the terminal (30) is started by using the corresponding line number n or the waiting means 102b. It

When the line reservation is started, if there is a free line at that time, the trunk blocking means (102a) of the first PBX (10) performs the line blocking process to reserve the line. Secured. First PBX (10)
When one of the communication lines used between the second PBX (10) and the second PBX (10) is disconnected due to the end of the communication, that is, the call is terminated, the line is secured by the blocking process by the trunk blocking means (102a). To be done. Next, the first P
When one of the communication lines used between the BX (10) and the second PBX (10) is terminated and disconnected,
By the closing processing by the trunk closing means (102a),
Further, the line is reserved and reserved, and similarly, the first PB
Every time the call line used between X (10) and the second PBX (10) is disconnected and disconnected, the trunk blocking means (102a) closes the process until n lines are secured. , Lines are reserved and reserved sequentially.

In this way, when the reservation of the n lines is ensured, the communication control device 102-2 allocates the reserved line to the terminal (30) which has issued the next 64K × n transmission request. If the terminal (30) that triggered the reservation process is registered in the waiting means 102b, the terminal (30) that has made the earliest 64K × n transmission request waits for the transmission request. The corresponding line (3
0) is assigned preferentially. <Fourth Embodiment> FIG. 14 shows the configuration of a fourth embodiment of an exchange system adopting the wideband exchange system according to the present invention.

In FIG. 14, parts substantially the same as those in FIG. 2, FIG. 6 or FIG. 9 are designated by the same reference numerals, and detailed description thereof will be omitted. PBX 10 is network 101
And a communication control device 102-4. The communication control device 102-4 has a trunk blocking unit 102a, a waiting unit 102b, and a 64K × n call counter 102c. These trunk blocking means 102a, waiting means 102b and 64K × n call counter 102c substantially correspond to a part of the channel securing means 11 shown in FIG.

The communication control unit 102-4 receives a call request from the terminal 30 using n lines of 64 Kbps,
If the number of available lines is less than the required number of lines n, the line is disconnected as busy, and the number of times the line is disconnected as busy is indicated by the 64K × n call counter 102c at the terminal 3
Count for each extension number of 0. When the count value of the 64K × n call counter 102c reaches the predetermined value q, the communication control device 102-3 starts the reservation reservation process of the line for the extension number, and the trunk blocking unit 102a opens the line reservation process at that time. When the trunk of the existing line is blocked to secure the line, and thereafter the trunk of the line that has become vacant due to the termination of the call is sequentially blocked to secure the required number of lines n, the line securing process ends. Also, the communication control device 10
2-3 starts registering reservation processing for the extension number, and at the same time, registers the extension number and the destination number of the terminal 30 in the waiting state in the waiting means 102b.

When the required number n of lines are secured, the communication control device 102-4 issues the earliest transmission request to use the n lines of 64 Kbps based on the registered contents of the waiting means 102b. Call the terminal 30
When there is a response from the trunk blocking means 1 to the terminal 30
The line secured by 02a is allocated.

More specific operations in the fourth embodiment of the exchange system shown in FIG. 14 will be described with reference to FIGS.
This will be described with reference to the timing chart shown in FIG. First
When some communication lines are used on the trunk line between the PBX (10) and the second PBX (10) and there are no free lines more than n (that is, when the number of free lines is less than n). ), When there is a call request of 64K × n from a certain calling terminal (30) coupled to the first PBX (10), the number of empty lines is less than n (for example, mn lines). The PBX (10) of No. 1 processes the call as busy and disconnects the line of the calling terminal (30). At this time,
The 64K × n call counter 102c sequentially counts the number of outgoing call requests that are disconnected as busy. At this time, the first PB
All terminals (30) connected to X (10) may be collectively counted for each required number of lines, or may be individually counted for each terminal (30). In this way, when the count value of the 64K × n call counter 102c reaches a predetermined value, for example, q, the waiting means 102b.
In addition, the reservation reservation process for the line corresponding to the corresponding terminal (30) is started.

When the line reservation is started, if there is a vacant line at that time, the trunk blocking means (102a) of the first PBX (10) performs line departure / arrival blocking processing to reserve the line. Secured. First PBX (10)
When one of the communication lines used between the second PBX (10) and the second PBX (10) is disconnected due to the end of the communication, that is, the call is terminated, the line is secured by the blocking process by the trunk blocking means (102a). To be done. Next, the first P
When one of the communication lines used between the BX (10) and the second PBX (10) is terminated and disconnected,
By the closing processing by the trunk closing means (102a),
Further, the line is reserved and reserved, and similarly, the first PB
Every time the call line used between X (10) and the second PBX (10) is disconnected and disconnected, the trunk blocking means (102a) closes the process until n lines are secured. , Lines are reserved and reserved sequentially.

In this way, when the reservation of the n lines is secured, the communication control device 102-2 causes the waiting means 102.
The terminal (30) that has made the earliest transmission request of 64K × n registered in b is called back, and the secured line is allocated to the corresponding terminal (30).

In this way, for a call that requires a large number of lines such as a video conference, the call channels are reserved and reserved in the order of vacancy, thereby giving an opportunity to carry out the communication substantially reliably. It will be possible.

[0053]

According to the present invention, when a call request for a broadband call using a plurality of call channels is received from a certain terminal and the number of call channels required by the call request exceeds the number of available call channels, it is necessary. A reservation process is performed to secure a channel, and the secured predetermined number of call channels is allocated to a line of the terminal device 3 that uses the predetermined number of call channels and has a call origination request. For this reason, the call request that requires a plurality of call channels is not abandoned unnecessarily, and the probability that a call that requires a plurality of call channels is established becomes high.

Therefore, according to the present invention, it is possible to provide a wideband switching system capable of effectively and appropriately allocating a call to a request for transmitting a broadband call signal which simultaneously uses a plurality of call channels. Is possible.

[Brief description of drawings]

FIG. 1 is a principle diagram of the present invention.

FIG. 2 is a configuration block diagram of a first embodiment of the present invention.

FIG. 3 is a diagram showing a line securing content of a trunk blocking unit.

FIG. 4 is a timing chart of the first embodiment.

FIG. 5 is a diagram schematically showing a specific exchange process of the first embodiment.

FIG. 6 is a configuration block diagram of a second embodiment of the present invention.

FIG. 7 is a diagram showing registered contents of a waiting means.

FIG. 8 is a timing chart of the second embodiment.

FIG. 9 is a configuration block diagram of a third embodiment of the present invention.

FIG. 10 is a diagram showing an example of contents of a 64K × n call counter.

FIG. 11 is a diagram showing another example of the contents of a 64K × n call counter.

FIG. 12 is a timing chart (No. 1) of the third embodiment.

FIG. 13 is a timing chart (No. 2) of the third embodiment.

FIG. 14 is a configuration block diagram of a fourth embodiment of the present invention.

FIG. 15 is a timing chart (No. 1) of the fourth embodiment.

FIG. 16 is a timing chart (No. 2) of the fourth embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Exchanger 2, 20 ... Trunk line 3 ... Terminal device 10 ... Private branch exchange (PBX) 11 ... Channel securing means 12 ... Allocation means 30 ... 64K × n terminal 40 ... Digital line circuit 50 ... Trunk circuit 101 ... Network 102-1 , 102-2, 102-3, 102-4 ... Communication control device 102a ... Trunk blocking means 102b ... Waiting means 102c ... 64K × n call counter 121 ... Call back means 122 ... Automatic calling means

Claims (7)

[Claims] 1. A plurality of exchanges (1) are connected to each other by a trunk line (2), one or more terminal devices (3) are connected to each exchange (1), and each trunk line (2) is connected. In the communication network in which the terminal device (3) performs communication including a broadband call using a plurality of call channels, each exchange (1) is free from the terminal device (3). A channel securing unit (11) that sequentially reserves and secures a required number of call channels based on a call request that uses a predetermined number of call channels that is greater than or equal to two that are being used; 11) The allocation means (12) for allocating the predetermined number of call channels secured to the line of the terminal device (3) having a call origination request using the predetermined number of call channels. Broadband switching method. 2. The channel reserving means (11) has means for reserving and reserving a call channel that is vacant at that time and successively reserving and reserving call channels for which the call has ended. The broadband switching system according to Item 1. 3. The channel securing means (11) has means for counting the number of times a call request is abandoned due to lack of available speech channels, and controlling the reservation securing processing of the speech channel according to the count value. The broadband switching system according to claim 2. 4. The channel securing means (11) counts the number of times a call request is abandoned for each terminal device (3) due to a shortage of available speech channels, and controls reservation processing of speech channels according to the count value. The broadband switching system according to claim 3, further comprising: 5. The terminal device, wherein the allocating means (12) first issues a call origination request to use the same number of communication channels after securing the predetermined number of communication channels secured by the channel securing means (11). The broadband switching system according to any one of claims 1 to 4, further comprising means for allocating to the line of (3). 6. The terminal device (3), wherein the allocating means (12) has issued a call origination request for allocating the predetermined number of call channels secured by the channel securing means (11). 6. The broadband switching system according to claim 5, further comprising means for preferentially allocating to the line. 7. The terminal device (3) which has issued a call origination request for securing the call channel when the predetermined number of call channels are secured by the channel securing unit (11). ) And a terminal (3) for returning the call back means (121).
7. The broadband switching system according to claim 6, further comprising an automatic transmission means (122) for automatically transmitting and connecting to the other party of the transmission request when there is a response from.