JP3107401B2 - How to monitor digital lines - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for monitoring a line in a digital switching system.

[0001]

2. Description of the Related Art At present, a typical digital communication network, i.
The SDN (Integrated Service Digital Network) is based on an interface structure that controls a plurality of information channels (B channels) using a D channel which is a common control channel. The D channel has a three-layered complicated message communication protocol for high reliability and high functionality, and the B channel has a computer exchange in addition to the conventional telephone exchange.
It has seven layers of advanced protocol procedures that can also perform inter-communications. The international standardization of these advanced protocol procedures is described in CCITT (International Telegraph and Telephone Consultative Committee) and I
It is being discussed at SO.

In such a background, various devices are
However, the importance of analysis tools with respect to differences in mounting specifications between devices and protocol failures in quasi-normal, abnormal, etc. is increasing. In general, since the protocol is complicated, it is difficult to determine the cause of the protocol failure only from the failure event.

For this reason, as shown in FIG. 8, a line monitor device 8 is branched and connected between two communication devices such as an exchange 26 and a terminal 12 to take in bit patterns on an up line and a down line and perform a semantic interpretation. It is displayed in real time, and protocol analysis is performed from the communication sequence before and after the failure. Japanese Unexamined Patent Publication No. Hei 2-13164 discloses that an ISDN interface between an exchange and a terminal allows a circuit device for extracting D channel information to be inserted.
As shown in FIG. 8 , there is disclosed a method of performing a test and monitoring by a maintenance device using a communication path switch without performing branch wiring connection.

[0004]

In the above prior art, the D channel information can be monitored from the extension interface of the exchange, but the B channel information is monitored or the remote line monitoring device monitors the B channel information. There was a problem that it was not possible. SUMMARY OF THE INVENTION An object of the present invention is to provide a digital line monitoring method capable of monitoring information transmitted on each channel in a digital switching network irrespective of B channel and D channel while ensuring security.

[0005]

In order to solve the above-mentioned problems, a subscriber interface for extracting uplink and downlink information of each channel is provided in the exchange, and information extracted by the subscriber interface is called. A notification is sent to the line monitor via a communication path switch in the exchange controlled by a connection procedure. Further, the monitor start and end notifications are transmitted from the exchange to the terminal using the monitored channel by a message on the control channel of the digital line. Further, an interface device provided at a preceding stage of the line monitor device transmits the uplink and downlink reception information of each channel, which is exchange-connected by the exchange to a separate communication channel, respectively, by using the same digital multiplexed line on the two digital multiplexed lines. It is transmitted to a channel and notified to the line monitor.

Further, the line monitor can be connected to the exchange via a digital exchange network. Further, a message for requesting a monitor display and information for specifying the position of a monitor channel are transmitted from the line monitoring device to the exchange, in a message on the control channel, and in response to this, the exchange switches the monitor line. Make a connection. Further, the switching system calls the telephone number among the telephone numbers registered in advance in response to a line monitor request from the outside.

[0007]

The subscriber interface provided in the exchange extracts a signal on each channel, designates a monitor channel by controlling the exchange, and allows the line monitor to be connected to an arbitrary remote place. Also, the terminal using the monitored channel receives and displays the monitor start and end notifications sent from the exchange. Further, the interface device transmits the uplink and downlink signals to be switched and connected to the same channel on the two digital multiplex lines to notify the line monitor device,
A conventional line monitor can be connected to the digital multiplex line.

Further, the line monitoring device transmits a message for requesting monitor display and position designation information of the monitor channel to a message on the control channel and transmits the message to the exchange to connect the monitor line. Let In addition, the exchange calls the telephone number in the telephone number registered in advance in response to a line monitor request from the outside.

[0009]

FIG. 1 is a block diagram of a system for monitoring a digital line according to the present invention. In FIG. 1, information on a transmission channel 100a from a terminal 12a to a terminal 12b in a subscriber interface 1a is transmitted to a monitoring channel 100b.
Similarly, the information on the transmission channel 101a from the terminal 12b to the terminal 12b is transmitted to the monitoring channel 101b.
Is taken out. The extracted information is exchange-connected to the office line interfaces 13a and 13b by the communication line switch 6, and after being transferred via the digital exchange network 10, is multiplexed on the digital multiplex line 14 by the subscriber interface unit 27. The communication path switch 6 is controlled by the main controller 11. The interface device 9 is a digital multiplex line 14.
The multiplexed information is re-separated by the built-in office line side receiving circuit 18 and is notified to the line monitor 8 via the multiplexed lines 16 and 17.

FIG. 2 is an internal configuration diagram of the subscriber interface 1a or 1b. The up line 2 and the down line 3 from the terminal device 12a respectively have two B channels and one D channel.
It has an interface structure in which channels are multiplexed. The multiplexed signal from the upstream line 2 is separated by the line receiving circuit 4, and the D channel information is transmitted to the D channel via the channel 104a.
The information is sent to the channel protocol processing unit 7, and the information of the B1 and B2 channels is transferred to the communication path switch 6 via the channels 102a and 100a, respectively. Line transmission circuit 5
Multiplexes the D, B1, and B2 channel information received from the channels 105a, 103a, and 101a, respectively, and transmits the multiplexed information to the downlink 3.

[0011] The channel 100b, 101 b for each said information of each channel is monitored, 102b, 10
The signal is branched at 3b, 104b and 105b and connected to the communication path switch 6. 8a and 8b are circuits for matching the speed of a D-channel signal having a transmission rate of 16 kbps to 64 kbps, which is the basic exchange unit data of the speech path switch 6, and are omitted when the transmission rate of the D-channel is 64 kbps. .

[0012] Generally, the entry side each time slot information highway exchange temporarily stored in the call memory, is transferred onto the predetermined time slots of the outgoing side highway by the time switch. Similarly, in FIG. 2, the information on the monitoring channels 100b to 105b is respectively assigned to time slots different from the communication path by switches assigned to the respective channels. Note that FIG. 2 can be similarly applied to the case where the subscriber interface structure is another structure such as 3B + D by changing the number of corresponding monitor channels.

FIG. 3 is an internal configuration diagram of the interface device 9. The interface device 9 is a digital multiplex line 14.
And 15 to the digital switching network 10 and to the line monitoring device 8 by digital multiplex lines 16 and 17. The main controller 20 performs protocol processing on the 16 kbps D channel input / output by the local line side receiving circuit 18 and the transmitting circuit 19, and at the same time, the key input unit 30
In response to the input, a call connection procedure process for monitoring is performed, and the display unit 31 displays a call state and the like.

B extracted by the line-side receiving circuit 18
The received information of 64 kbps on the 1 and B2 channels is converted to 16 kbps by the speed conversion circuits 21a and 21b. When outputting at 64 kbps, the speed conversion circuits 21a and 21b do not perform the speed conversion process. The transmission circuit 22a and the transmission circuit 22b have the above 16 kbps or 64 kbps.
A kbps signal is transmitted on the same channel on digital multiplex lines 16 and 17.

Further, the upstream monitor information and the downstream monitor information on the digital multiplex line 14 are stored in a frame component 14a.
As shown in (1), when the data is included in the B1 channel and the B2 channel, the local line side receiving circuit 18 sends the monitor information to the speed conversion circuits 21a and 21b. By the operation of the interface device 9 as described above,
Can monitor both upstream and downstream signals simultaneously.
This function is the same as that in the case where the line monitor device 8 is branched and connected to the monitor line.

FIGS. 4 to 6 are flowcharts for explaining the monitoring operation executed inside the exchange. FIG. 4 is a flowchart showing the procedure for starting monitoring. Step S
When a monitor start request is accepted in step S1, it is determined in step S2 whether or not the monitor channel is the B channel. If there is a call using the B channel in step S3, the calling side is determined in step S4. A monitor notification message is transmitted to the receiving terminal, and the display device of the channel is set to be monitored in step S5.

FIG. 5 is a flowchart showing the procedure for ending the monitor. When the monitor termination request is received in step S7, it is determined in step S8 whether or not the monitor channel is the B channel. If there is a call using the B channel in step S9, the calling side is determined in step S10. And a monitor end message is transmitted to the called terminal, and step S5
Resets the display device of the channel.

FIG. 6 is a flowchart showing processing when a new call occurs. When a new call is accepted in step S13, it is determined in step S14 whether the channel used by the call is the channel being monitored.
Sends a monitor notification message to the calling and called terminals. Note that the messages such as the monitor notification and the monitor end notification are messages on the control channel.

FIG. 7 is a sequence diagram in a case where monitoring is automatically performed by a line monitoring device installed in a remote place. First, as a monitor request procedure, the interface device 9
Then, a call setting message including "monitor request display", "designated line / channel position display" and the like is transmitted. The call setup message is transmitted using information elements that can be freely defined and used by the user. The exchange 26 receives the call setting message and, if monitoring is possible, displays "monitor request acceptance display" in the user-defined information element.
The call is released by transmitting a release completion message including the message (1), and at the same time, the connection of the monitor line shown in block 23 is made. Then, as shown in block 24, the registration number of the line monitor previously registered in the internal memory is changed. Read and make a call.

When the call connection for monitoring the upstream and downstream information is completed according to the above-described procedure, the exchange 26 notifies the start of the monitoring shown in FIG. 4 shown in a block 27, and the interface device 9 responds accordingly. To start. The monitor request can be made in the same manner by specifying the line / channel position from the maintenance terminal of the exchange.

[0021]

According to the present invention, since the subscriber interface in the exchange extracts the signal on each channel and controls the monitor channel, the monitor of the arbitrary channel can be designated, and the arbitrary remote monitor can be specified. A line monitoring device can be connected to the ground. In addition, since the exchange notifies the terminal of the start and end of the monitor to the terminal, eavesdropping can be prevented. In addition, since the interface device transmits the upstream and downstream signals on the same channel of the two digital multiplex lines, the line monitor can be operated in the same manner as the case where the line monitor device is branched and connected to the digital multiplex line. A conventional line monitor can be used as it is.

Also, the line monitor sends a monitor display request and monitor channel position designation information to the exchange, so that the exchange can automatically perform the switching connection of the monitor line. Remote control becomes possible. In addition, the exchange can call the telephone number in the telephone number registered in advance in response to a line monitor request from the outside, so that erroneous connection can be prevented.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a system for monitoring a digital line according to the present invention.

FIG. 2 is an internal configuration diagram of a subscriber interface according to the present invention;

FIG. 3 is an internal configuration diagram of an interface device according to the present invention.

FIG. 4 is a flowchart showing a procedure for starting a monitor in the present invention.
It is a chart.

FIG. 5 is a flowchart showing a procedure for ending a monitor in the present invention.
It is a chart.

FIG. 6 is a flowchart showing the processing of the present invention when a new call occurs.

FIG. 7 is a sequence diagram in a case where monitoring is automatically performed by a line monitoring device installed at a remote place in the present invention.

FIG. 8 is a connection diagram of a conventional line monitor device.

[Explanation of symbols]

 1a Subscriber interface 2 Up line 3 Down line 4 Line receiving circuit 5 Line transmitting circuit 6 Communication path switch 7 D channel protocol processing section 8 Line monitoring device 9 Interface device 10 Digital switching network 11 Main control device 12 Terminal 13 Office line Interface 14 Digital multiplex line 18 Local line side receiving circuit 19 Local line side transmitting circuit 20 Main controller 21 Speed conversion circuit 22 Transmission circuit 26 Switch 27 Subscriber interface unit 30 Key input unit 31 Display unit

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-63-107259 (JP, A) JP-A-64-25646 (JP, A) JP-A-56-149160 (JP, A) JP-A-4- 113755 (JP, A) JP-A-4-256266 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04M 3/22 H04Q 3/42 H04Q 11/00-11/08 H04B 3/46-3/48 H04B 17/00-17/02

Claims (4)

(57) [Claims] 1. A method of monitoring digital line monitoring by the communication information line monitoring apparatus of each channel on the digital multiplex line connecting between terminals such as a communication device and between the switch and other switch or switches, the monitored channel From
The extracted uplink information and downlink information are transferred to the communication path in the above exchange.
Switch switches to separate communication channels
Followed by the uplink information transmitted on the separate communication channel
The downlink information is sent to the subscriber interface on the line monitor device side.
To the subscriber interface and the line monitor.
By the interface device placed between the device and
The uplink information and downlink information of the monitored channel are respectively
A method for monitoring a digital line, wherein the same line is used on a separate digital multiplex line to notify the line monitor. 2. The terminal according to claim 1, wherein said exchange uses a control channel of said digital multiplex line to use said monitored channel.
The method according to claim 1, further comprising transmitting a notification message indicating the start and end of the monitoring. 3. A subscriber interface on the line monitor device side.
Is connected to the above exchange via a digital exchange network.
The line monitoring device specifies the monitored channel.
The control message for the specified monitor request is
To the exchange via the network, and the exchange
After receiving the control message, the line monitoring device
Starts the connection operation with the monitored channel.
The upstream and downstream information of the data channel
Via the subscriber interface on the line monitor device side
3. The method according to claim 1, wherein
How to monitor the digital line described . 4. The exchange receiving the control message,
Disconnect the connection with the above line monitor once, and
Based on the telephone number of the line monitor
Call setup between the line monitoring device and the monitored channel
4. The method for monitoring a digital line according to claim 3, wherein: