JPH02205147A - Communication control equipment - Google Patents

Abstract

PURPOSE:To eliminate influence on transmission data to the channel B of another subscriber terminal connected in bus shape by issuing an instruction to a channel B switching circuit by a call control processing part when the channel B is set at a null state, and comprising a transmission origin processing part to the channel B as a circuit to send binary '1'. CONSTITUTION:When each channel B is released, the call control processing part 10 selects the signal transmission path of a path 101 when releasing a channel B1, and that of a path 102 when releasing a channel B2 by controlling a channel B switching circuit 11. Thereby, data transmitted from a corresponding processing part is absorbed in the channel B switching circuit 11 and is not inputted to an ISDN layer LSI 8 even when any kind of data is intended to transmit from a data link control part 13 and a telephone control part 14, and the transmission data to each channel B goes to the binary, '1', sent from a binary '1' sending circuit 12. Therefore, no influence is given on the transmission data of another subscriber terminal connected in bus shape.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a terminal-side communication control device that supports an ISDN basic interface, and particularly to a circuit system for initial setting of an information transfer channel.

[Prior art] CCI as a recommendation regarding ISDN basic interface.
At 1.430 of TT, a binary “1” is written for an empty B channel.
The meaning of this recommendation is that - multiple subscriber terminals connected like a bus on one subscriber line share the same physical B channel; When a subscriber terminal that has not set up a channel sends a binary "0" to the B channel, a subscriber terminal that has set up a B channel sends a binary "11" to the B channel. However, due to the characteristics of ISDN layer 1, the data that reaches the exchange will be a binary ``0'', so the data sent to the B channel by a subscriber terminal that has not set up a B channel will be converted to a binary ``1''. '', so as not to affect the transmission data of subscriber terminals that have set up the B channel.

Traditionally, L
In SI, as a circuit related to the hat transfer channel (hereinafter simply referred to as B channel), for example, as described in 1988 Institute of Electronics, Information and Communication Engineers Spring National Conference B-374, each time-divided B channel is There are known circuits that convert data into continuous bit string data through a FIFO, and circuits that perform the opposite function. However, apart from the data for each B channel that is manually input from outside the LSI, a circuit that sends out binary "I+" to each B channel was not included.In addition, a module that supports the ISDN basic interface was not included. 1986 IEICE Spring National Conference
B-373, a configuration is known in which the data sending unit for each B channel is configured such that data input from the application side is output to the subscriber line via the ISDN LSI. However, the circuit switching connection control for setting/releasing the B channel is not configured to be able to independently send a binary "1" to each of the three channels. Therefore, I of CCIT'I'.

In order to realize sending and holding binary "1" for empty B channels as described in the 430 Recommendation, when the circuit switching connection control that sets/releases the B channel releases the B channel,
This fact had to be notified to the application side that communicates using the B channel, and the application side had to send the binary 1111# to the vacant B channel.

[Problem to be solved by the invention]

In conventional devices, although the call control processing unit manages the setting/release of the B channel, the sending of a binary "1" to an empty B channel is limited to the transmission of voice, data, images, etc. using the B channel. Since this is left to the communication processing unit that performs communication, if there is a delay in the processing of the communication processing unit above when the B channel is released H,9, the processing to send a binary “1” to the vacant B channel will be delayed, and the bus type There was a problem in that the transmission data to the B channel of other subscriber terminals connected to the network was affected.

An object of the present invention is to allow a communication processing unit that performs voice, data, image, etc. communications during a B channel connection to continue making calls to the vacant B channel even if a processing delay occurs when the B channel is released. The control processing section independently sends out a binary "1".

Another object of the present invention is to send a binary "1" to the B channel even if the program of the call control processing section goes out of control, so that the B channel of other subscriber terminals connected in a bus manner is
The goal is not to affect the data sent to the channel.

[Means to solve the problem]

In order to achieve the above object, the communication control device of the present invention includes:
Separately from the communication processing unit that communicates voice, data, images, etc. while the B channel is connected, the binary "]" for each B channel is
', and a circuit that switches the source processing section of each B channel to a circuit that sends out a binary "1" from the communication processing section.
A feature of this system is that the call control processing section can independently send a binary "1" to the channel.

Another feature of the present invention is that, in case the call control processing section itself is unable to control switching of the B channel due to program runaway, a circuit is provided to detect program runaway in the call control processing section. When detecting a program runaway in the processing section, the circuit switches the B channel switching circuit to a circuit that sends out a binary "1" from the processing section that communicates while the B channel is connected.

[Operation] According to the present invention, when the B channel is in an empty state, the call control processing section issues an instruction to the B channel switching circuit to send out a binary "1" to the source processing section for the B channel. Let it be a circuit. When setting the B channel, voice, data,
After notifying the communication processing unit that communicates images, etc. of the B channel setting, it issues an instruction to the switching circuit, and switches the transmission source processing unit to the corresponding B channel from the circuit that sends binary 1j l $1 to the above communication. Switch to the processing section. As a result, even if the communication processing section erroneously sends data before setting the B channel, the switching circuit sends a binary "1" to the corresponding B channel, so the connection is made in a bus type. transmission data of other subscriber terminals is not affected. Furthermore, when releasing the B channel, the call control processing unit issues an instruction to the switching circuit to switch the source processing unit for the corresponding B channel from the communication processing unit to the circuit that sends out the binary It 171, and then The communication processing unit is notified of the release of the B channel. As a result, even if there is a delay in the B channel release process of the communication processing section, the B channel will have a binary 11
Since 11# has already been sent out, it does not affect the transmission data of other subscriber terminals connected in the bus type, as in the case of setting the B channel.

Furthermore, even if the call control processing section becomes unable to control the switching circuit due to a runaway program, the switching circuit can be switched as soon as the circuit that detects the program runaway of the call control processing section detects the program runaway of the call control processing section. give instructions to the circuit,
The source processing unit for the B channel is changed from the Hill 6 communication processing unit to 2.
Since the circuit is switched to a circuit that transmits decimal 111 II, it does not affect the transmission data of other subscriber terminals connected in a bus type.

(Example〕 An embodiment of the present invention will now be described with reference to the drawings.

FIG. 1 is a block diagram of an ISDN subscriber terminal supporting an ISDN basic interface. This IS
The DN subscriber terminal is composed of a subscriber terminal main body 1 and a TSI3N communication control device 2, and can perform data communication using a B1 channel and voice communication using a handset 6 using a B2 channel.

The subscriber terminal body [includes a display device t'? 3, keyboard 4, external storage device α5 are connected, and IS
A handset 6 and an rSDN subscription device 7 are connected to the 1jti control device 2, and the subscriber terminal main body 1 and the 1SDN communication system Sakaki device 2 are connected by a bus connection, and the upper td Both parties can directly exchange data.The ISDN communication control device 2 controls layer 1 on the subscriber side of the ISDNJ/j interface.

ISDN layer LLSI 8 that performs separation/multifunction of each channel of Bl and B2, LAPD processing unit 9 that performs data link control on D channel, call control processing unit 10 that performs setting/release control of each B channel, call control processing A B channel switching circuit 11 that switches the transmission source processing section of each B channel according to instructions from the section 10. Binary ``''b output circuit 12, which sends a binary ``1'' to each B channel. A data link control unit 13 for performing data communication on the B1 channel, a telephone control unit 14 for performing voice communication using the handset 6 on the B2 channel, and functions of the ISDN communication control device 2 are implemented in the subscriber terminal body 1. It consists of an E-level interface unit 15 provided to the user.

In this configuration, the call control processing unit 10 performs setting/release control of each B channel according to the call control protocol, and when setting/releasing each B channel, the B channel switching circuit 1
1, and the binary “1” of the B channel that is now in an empty state is controlled.
” is maintained.

Next, inside the ISDN communication control neck. The route of transmission/reception data (number q) of each channel will be explained.

FIG. 2 is a diagram showing connections of transmission/reception data signal lines of each B channel within the ISDN communication control device.

The ISDN layer lLSI8 allows each channel of D, Bl, and B2 to have #! i/Signal lines for multiplexed transmission/reception data are connected to each processing unit as follows. The transmission/reception signal line of the D channel is connected to the LAPI) processing unit 9,
l, the B2 channel transmission signal line is connected to the channel-compatible switch circuit of the B channel switching circuit 11, the B1 channel reception signal line is connected to the data link control unit 13, and the B2 channel reception signal line is connected to the telephone control unit 14. Connecting. Further, the transmission signal line 16 from the data link control unit 1:8 and the telephone control unit 14, and the transmission signal line 16 from the binary "1" transmission circuit I2 are connected to a switch circuit corresponding to the channel of the B channel switching circuit 12. Connect to.

When setting the B1 channel, the IF 71 control processing unit 10 controls the +3 channel switching circuit 12 to set the transmission signal path to the B1 channel as the path 100. When route 100 is selected, the B1 channel transmission/reception signal lines are both connected to the data link control unit 13, so data communication using the B1 channel becomes possible. Further, when setting the B2 channel, the call control processing section 10 controls the B channel switching circuit 12 to set the transmission signal path to the B channel as the path 103.

When path 103 is selected, the transmission/reception signal lines of the B2 channel are both connected to the telephone control section 14, so the B2
Voice communication using channels becomes possible. Then, when each B channel is released, the call control processing unit 10 controls the B channel switching circuit 12, and when the B1 channel is released, the call control processing unit 10 controls the B channel switching circuit 12, and when the B1 channel is released,
When the 01.82 channel is released, the transmission signal route 102 is selected. As a result, no matter what data the data link control unit 13 and the telephone control unit 14 transmit, the data transmitted from the corresponding processing unit is absorbed by the B channel switching circuit 11, is not input to the ISDN layer I LSI 8, and is transferred to each B channel. Since the transmission data to the channel is the binary "1" sent out from the binary "1" sending circuit 12, it does not affect the transmission data of other subscriber terminals connected in the bus type.

Note that in this configuration, the reception signal lines of each of the 8 channels are directly connected to the processing unit that performs communication when setting the B channel.
This is because received data does not affect other subscriber terminals connected in a bus type, unlike transmitted data, so the number of circuits can be reduced.

Next, a processing flow of B channel switching circuit control when setting/releasing a B channel by the call control processing section 10 will be described.

FIG. 3 is a processing flow of B channel switching circuit control when the call control processing section 10 sets the B channel.

When setting the B channel, the call control processing unit 10 first performs determination 2.
At 00, it is determined whether the B channel setting process according to the protocol is completed. If the B channel setting process according to the protocol has not been completed, the process ends without performing any subsequent B channel switching process. When the B channel setting process according to the protocol is completed, it is determined in determination 201 whether the type of the set B channel is a B1 channel or a B2 channel. If the channel type is 81 channel, the data link control unit 13 is notified of the B channel setting in step 202. Thereafter, in step 203, an instruction is issued to the B channel switching circuit 11 to change the transmission signal path of the B1 channel from path 101 to path 100 shown in FIG.

In this way, the B channel settings are set by the data link controller 1.
Since the B channel is switched after notifying the B channel, even if the data ring control unit 13 mistakenly transmits data before setting the B channel, the data ring control unit 13 will not be able to switch the B channel until the call control processing unit 10 performs the B channel switching process. Since a binary "1" is sent on the subscriber line, it does not affect the data transmitted by other subscriber terminals connected in a bus type.
If the determination result in step 1 is 82 channels, process 204
In step 205, the setting of the B channel is notified to the telephone control unit 14, and then in step 205, an instruction is issued to the B channel switching circuit 11 to change the transmission signal path of the B2 channel from path 102 to path 103 shown in FIG. . Therefore, similarly to the B1 channel, since the B channel is switched after notifying the B channel setting to the telephone controller 14, the telephone controller 14
4 accidentally sends data before setting the B channel, the binary 11111 is sent out on the subscriber line until the call control processing unit 10 performs the B channel switching process, so the connection is not connected in a bus type. transmission data of other subscriber terminals is not affected.

FIG. 4 is a processing flow of B channel switching circuit control when the call control processing section 10 releases the B channel.

When releasing the B channel, the call control processing unit 10 first performs determination 3.
At 00, it is determined whether the B channel release process according to the protocol has been completed. If the B channel release process according to the protocol has not been completed, the process ends without performing any subsequent B channel switching process. °B on the protocol
When the channel release process is completed, it is determined in determination 301 whether the type of the released B channel is a B1 channel or a B2 channel. If the channel type is the B1 channel, in step 302 an instruction is issued to the B channel switching circuit 11 to change the transmission signal path of the B1 channel from path 100 to path 101 shown in FIG. After that, processing 30
At step 3, the release of the B channel is notified to the data ring control unit 13.

In this way, since the release of the B channel is notified to the data link control unit 13 after switching the B channel, even if a delay occurs in the 8 channel release process of the data ring control unit 13, the call control processing unit 10 As a result of the B channel switching process, a binary "1" is already sent on the subscriber line, so it does not affect the transmission data of other subscriber terminals connected in a bus type. If the determination result in is the B2 channel, in step 304 an instruction is issued to the B channel switching circuit 11 to change the transmission signal path of the B2 channel from path 103 to path 102 shown in FIG.
Thereafter, in process 305, the IIt conversation control unit 14 is notified of the release of the B channel. Therefore, similarly to the B1 channel, since the B channel switching method is performed and the percentage of B channel release is notified to the talk control unit 14, a delay occurs in the B channel release process of the telephone control unit 14. However, due to the B channel switching process of the call control processing unit 10, a binary “1” is already on the subscriber line.
” is sent out, so it does not affect the transmission data of other subscriber terminals connected in a bus type.

FIG. 5 shows that when the program of the call control processing section 10 goes out of control,
FIG. 2 is a configuration diagram of an ISDN communication control device Vi2 that sends a binary "1" to a channel. The difference from Figure 2 is
A runaway detection unit 17 that detects a program runaway in the call control processing unit 10, and a control switching unit 1 that switches the control right of the B channel switching circuit 11 from the call control processing unit 10 to the runaway detection unit 17.
The reason is that 8 was established.

When the program of the call control processing unit 10 is operating normally, the state of the switch circuit held by the control switching unit 18 is that it is connected to the call control processing unit 10 on the path 104, and the control authority of the B channel switching circuit 11 is It is located in the call control processing section 10. In this state, the same processing as explained in FIGS. 1 to 4 can be performed. However, when the M run detection section 17 detects a program runaway in the call control processing section 10, the runaway detection section 17 issues an instruction to the control switching section 18.

The state of the switch circuit held by the control switching unit 18 is transferred to the path 10.
5, the control right of the B channel switching circuit 11 is transferred from the call control processing section 10 to its own processing section, and an instruction is issued to the B channel switching circuit 11.

The transmission signal paths for the B1 channel and B2 channel are route 101 and route 102, respectively, and the transmission data of each B channel is set to binary "1" without affecting the transmission data of other subscriber terminals connected in a bus type. Do it like this.

Next, the processing flow of the runaway detection section 17 will be explained.

FIG. 6 is a processing flow of the runaway detection section 17.

The runaway detection unit 17 always detects the call control processing unit l in the 1 judgment 400.
Monitor the program operation status of O. At this time, the state of the switch circuit held by the control switching unit 18 is the path 104 shown in FIG. If program runaway in section 10 is detected, process 401
Then, an instruction is given to the control switching unit 18, and the control switching unit 18
The control authority of the B channel switching circuit 11 is transferred from the call control processing unit 10 to its own processing unit by using the state of the switch circuit held by the call control processing unit 10 as the route 105 shown in FIG. In order to prevent the transmission signal path of each B channel from being set to path 100 or path 103 by mistake, it is recommended to separate the call control processing unit 10 and the H channel switching circuit 11.
It has been the target.

In process 402, an instruction is issued to the B channel switching circuit 11 to switch the transmission source processing unit for the B1 channel from the data link control unit 13 to the 2″IP, “l” sending circuit 12, and
The data sent to channel 1 is set to binary “1”, and
In process 403, an instruction is issued to the B channel switching circuit 11 to switch the transmission source processing unit for the B2 channel from the telephone control unit 14 to the binary ``12'' sending circuit 12, and to change the transmission data to the B2 channel to the binary ``12'' sending circuit 12. ''. Then, process 404
Due to the program runaway of the call control processing unit 10, the ISD
The subscriber terminal body 1 is notified that the N communication service can no longer be provided.

In this way, even if the call control processing unit 10 that performs B channel setup/release control causes a program runaway, the binary Hl #l can be sent to each B channel. It does not affect the transmitted ID data of subscriber terminals.

〔Effect of the invention〕

According to the present invention, since the call control processing unit can independently send a binary “1” to the B channel that is in an empty state,
It also does not affect the transmitted data of other subscriber terminals connected in the bus type.

The communication processing unit for voice, data, image, etc. that performs communication during the B channel setup does not know the processing speed related to the B channel release process.6Furthermore, the call control processing unit may Even if the channel switching circuit cannot be controlled, a binary "1" can be sent to the B channel.

[Brief explanation of the drawing]

Figure 1 shows the I
A configuration diagram of each SDN subscriber terminal, Figure 2 is the ISDN shown in Figure 1.
Connection analysis of each B channel transmission/reception data signal line in the communication control device, Figure 3 shows the processing flow when setting the B channel of the call control processing section in Figure 2, and Figure 4 shows the call control processing in Figure 2. Figure 5 shows the processing flow when the B channel is released in the call control processing section when the program runs out of control.
FIG. 6 is a block diagram of the ISDN communication control device that sends out "1" and shows the processing flow of the runaway detection section in FIG. 5. 1...Subscriber terminal main body, 2...ISDN communication ¥11
control device. 3... Display device, 4... Keyboard, 5... External storage device, 6... Handset, 7... Participating veteran,
8... ISDN layer ILSI, 9... LAPD processing section, 10... Call control processing section, 11... B channel switching circuit, 12... Binary "1" sending circuit, 13...
・Data link control unit, 14...Telephone control unit, 15・
...Upper interface section, 16...Transmission signal line, 1
7... Runaway detection section, 18... Control switching section, 100
, 101...Transmission signal path to B1 channel, 102
．． 103...Transmission signal path to B2 channel, 104
, 105...B channel switching circuit control path. Figure 1 Figure 11

Claims (1)

[Claims] 1. In a communication control device on the subscriber side that supports the ISDN basic interface, each information transfer channel is , and a circuit for switching the transmission source processing section of each information transfer channel to a circuit that sends out a binary "1" from the communication processing section. A communication control device characterized in that a call control processing unit can independently send a binary “1” to an information transfer channel that becomes vacant when the channel is released. 2. The communication control device according to claim 1, further comprising a circuit for detecting a runaway of the communication program, and when detecting a runaway of the communication program, the circuit switches the information transfer channel switching circuit to the communication control device while the information transfer channel is connected. 1. A communication control device characterized in that a processing section that performs a process is switched to a circuit that sends out a binary "1".