JP3296364B2 - Communications system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

 [Object of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication system in which time-division multiplexers communicate with each other via an ISDN public line.

[0002]

2. Description of the Related Art In a time-division multiplexing apparatus, it is necessary to perform communication by matching a channel to be used with an opposing time-division multiplexing apparatus. Unless a proper call is set, multiplexing / demultiplexing cannot be performed properly.

[0003] On the other hand, with the recent widespread provision of services over the ISDN network, it has been considered to connect opposing time-division multiplexing devices via this ISDN network for communication.

[0004]

However, the ISD
In the N public network, a method for transmitting the used channel information has not been established in the call setting, and the time division multiplexing apparatus facing the N public network can appropriately communicate via the ISDN public network. could not.

[0005] The present invention has been made in view of such circumstances, and an object of the present invention is to use a plurality of channels of an ISDN line in time and minute.
An object of the present invention is to provide a communication system in which a time division multiplexing device used as a divided time slot can appropriately perform communication. [Configuration of the invention]

[0006]

SUMMARY OF THE INVENTION The present invention provides an ISDN line.
Using multiple channels as time-division time slots
In a communication system in which a division multiplexing device is connected by an ISDN network, the time division multiplexing device on the transmitting side includes:
Do not call for each time-division time slot
Call setup time slot information indicating squid in subaddress
Comprising a call control means for transmitting and receiving converted and, on the receiving side the
The call control means of the time division multiplexing device receives the received subaddress.
The information of the ISDN line is compared with the subaddress information held in the own device.
Call control for several channels is performed.
You.

[0007]

According to the communication system having the above configuration, the time division
Whether to call each time slot or not
The call setup time slot information shown
The sub-address information received and transmitted and received
Is compared with the sub-address information held in
Based on the result of the comparison, the ISDN line
Call control is performed.

[0008]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of a time division multiplexing apparatus 100 employed in one embodiment of the present invention. In FIG. 1, a time-division multiplexing apparatus 100 includes a CPU for controlling the apparatus.
The CPU 1 is provided with a ROM 2 serving as a program memory, a RAM 3 serving as a working memory, and an MMI via a data bus, an address bus, and a control bus.
(Man-machine) interface 4 A Dch (D channel) interface 5 and a multiplexing control unit 6 are connected.
The MMI interface 4 CRT with keyboard input device 7 is connected to the multiplexing control section 6 slow terminal 8 _1-8
n and ISDN lines are connected. The Dch interface 5 sends and receives a call setup message using the Dch (channel) via the multiplexing control unit 6. The CPU 1 controls the symmetrical call setting by using the programs in the flowcharts of FIGS. FIG. 2 is a flowchart of an operation when data is input from the keyboard input device with a CRT 7,
FIG. 3 is a flowchart of the operation when a call setup message is received from the opposing time division multiplexing apparatus.
FIG. 5 is a flowchart of an operation when a call is transmitted to the opposing time-division multiplexing apparatus. FIG. 5 is a flowchart of an operation when the call setting time slot information for each channel is converted into destination sub-address information. 7 is a flowchart of a call processing operation after receiving a call setting message from the time division multiplexing device.

The time division multiplexer 100 shown in FIG.
They are connected so as to communicate with each other via a DN public network. In both of the time-division multiplexing devices thus arranged opposite to each other, the ISDN
Time slot information for setting a call to the public network is input.
This time slot information is taken in by the CPU 1 via the MMI interface 4. That is, the CPU 1
In the MI input process (201), time slot information is fetched from the MMI interface 4 to identify whether it is a transmission request or call setting time slot information (202). Here, since it is the call setting time slot information, the process proceeds to the conversion process of FIG.

[0010] The multiplexing control unit 6 of this embodiment uses six B channels of the ISDN line and as shown in FIGS.
Performs transmission of 24 bps time slots. Therefore, in the conversion processing of FIG. 5, first, in correspondence with the input call setting time slot information, 24 bits of data are created by setting a channel for which a call is set to 0 and a channel for which no call is set to 1 out of 24 channels (FIG. 7 301). Next, it is divided into four bits from the left, and the upper four bits in each segment are 0011 (bin).
To convert it into an IA5 character (302 in FIG. 7). Conversion to the IA5 character created in this way is conversion to destination sub-address information (see FIG. 5, 20).
6). Next, the CPU 1 stores the converted destination sub address information in the RAM 3 (207).

Next, in the time-division multiplexing apparatus 100 on the calling side, a call request is input from the keyboard input device 7 with CRT. Therefore, the CPU 1 fetches a call request in the MMI input process of FIG. 2 (201), and identifies whether a call (call) request has been input or call setting time slot information has been input (202). In this case, since the call is a call request, the process proceeds to the call control procedure (call) in FIG.

That is, the calling CPU 1 reads out the sub address information stored in the RAM from the RAM 3 and sets it in the destination sub address information element (303 in FIG. 8).
The necessary data is set to form a destination subaddress information element, which is set in the call setup message (30 in FIG. 8).
Four). Thus, the call setting message generation processing of FIG. 2 is performed (204 of FIG. 4). Next, the CPU 1 proceeds to transmission procedure processing (205). In the outgoing call procedure, via the Ho channel
Along with the call setting of the 24 channels requiring call setting, the CPU 1 sends a call setting message such as a destination address and a destination sub address from the multiplexing control unit 6 via the D channel interface 5 to the ISDN public network.
The ISDN public network sends the call setup message to the called time-division multiplexer 100 via the D channel. Accordingly, the D-channel interface 25 is provided to the called CPU 1.
The call setting message is received via the CPU 1, and the CPU 1 executes the program of FIG. 3 to receive the call setting message (203). When the receiving process is completed, the process proceeds to the call control procedure of FIG. In the call control procedure, the CPU 1 extracts the destination sub-address information from the incoming call setup message and compares it with the destination sub-address information already stored in the RAM 3 (208). Then, match and mismatch are detected (20
9) When they match, the D channel interface 5 sends the response information (210), whereby the ISDN public network executes the call setup request given via the Ho channel, and the opposing time division multiplexing device Between 100 desired channels are formed. On the other hand, if they do not match, the line disconnection information is transmitted from the D channel interface 5 (211).

In this way, in the called-side time-division multiplexing apparatus 100, the call setting time slot information transmitted as the destination subaddress information is compared with the call setting time slot information input in the own station. Depending on
A time-division multiplex communication channel setting is performed.

[0014]

As described above, according to the communication system of the present invention, call setup is performed for each of the time-division time slots.
Call setup time slot information indicating whether
Sub-address is converted to
Address information and sub-address information held in the own device.
Are compared, and based on the comparison result, the ISDN line
Call control for multiple channels of
Transition to communication state when the same sub address is used, and time division
Proper communication between the multiplexing devices is ensured.

[Brief description of the drawings]

FIG. 1 is a block diagram of a time division multiplexer used in one embodiment of the present invention.

FIG. 2 is a flowchart showing the operation of one embodiment of the present invention.

FIG. 3 is a flowchart showing the operation of one embodiment of the present invention.

FIG. 4 is a flowchart showing the operation of one embodiment of the present invention.

FIG. 5 is a flowchart showing the operation of one embodiment of the present invention.

FIG. 6 is a flowchart showing the operation of one embodiment of the present invention.

FIG. 7 is a diagram showing a process for converting call setting time slot information into a call setting message.

FIG. 8 is a diagram showing a process of using call setting time slot information as a call setting message.

[Explanation of symbols]

1 CPU 2 ROM 3 RAM 4 MMI interface 5 Dch interface 6 multiplexer controller 7 CRT with keyboard input device 8 ₁ to 8 _n low-speed terminal 100 time division multiplexer

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-64-11492 (JP, A) JP-A-2-161854 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04L 12/02 H04J 3/00

Claims (2)

(57) [Claims] 1. A time-sharing function for a plurality of channels of an ISDN line.
The time division multiplexing device used as the IM slot is ISDN
In a communication system connected by a network, the time-division multiplexing device on the transmitting side may transmit the time-division time
Call setup to indicate whether or not to call each lot
A call control means for converting the fixed time slot information into a subaddress and transmitting / receiving the same; the call control means of the time-division multiplexing apparatus on the receiving side,
Subaddress information and the subaddress stored in the
Address information, and based on the comparison result, the IS
Communication system comprising a call <br/> that performs call control for a plurality channel of DN line. 2. The time division multiplexing device according to claim 1, wherein
Address information and sub-address information held in the own device
If the information matches, the time division multiplex
If the call setup time slot information with the
Determination to proceed to response processing, when the discrepancy is the own device
Call setup time slot with time-division multiplexing equipment related to communication partner
2. The communication system according to claim 1, wherein it is determined that the packet information does not match, and the process proceeds to a disconnection process.