JPH03201844A - Line frame trace system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Summary] This invention relates to a line frame tracing method for a packet switch that transmits and receives call control signals to and from a telephone network using common line signals.

When a subscriber terminal number accommodated in a line switch that is subject to frame tracing is registered in a packet switch, the purpose is to perform frame tracing of the line used by the corresponding subscriber terminal from origination to disconnection.

Register the terminal number of the telephone network for which line frame tracing is desired in the packet switch, and when a call is set up from the telephone network to the packet switch, outgoing signal information including the calling terminal number and line number is sent via the common line signaling device. When received, it is compared with the terminal number of the telephone network registered above, and if it matches, a frame trace of the line number is started, and when a disconnection signal sent via the common line signaling device is received when the call is disconnected, It is configured to match the terminal number obtained from the line number with the registered terminal number of the telephone network and stop frame tracing that fails.

[Industrial Application Field] The present invention relates to a line frame tracing method for a packet switch that transmits and receives call control signals to and from a telephone network using common line signals.

In recent years, communications using a five-packet switching network have come into use, but the connection to this packet switching network is
S D N (Integrated 5ervic
This can be done via a line switch compatible with es Digital Network).

On the other hand, frame tracing is performed to record all signals (frames) sent and received to and from a designated bucket terminal as a periodic operation, perhaps due to an abnormality report from a subscriber regarding packet communications.

This frame trace shows frame-level line failures (
When a bit error, etc.) occurs.

The frame contents of that line are sequentially recorded (logging),
It is used as data for analyzing the causes of failures.

When a subscriber (terminal) of a circuit switch connects to a packet switch and performs packet communication, it is also necessary to perform frame tracing for a designated terminal in the packet switch. However, when a packet switch is accessed through a single-line switch, extra processing is required because it is not known which subscriber (terminal) is using which line to communicate.

[Conventional technology] FIG. 6 is an explanatory diagram of a conventional example.

The packet terminal 60 is accommodated in a line switch 61 compatible with 15DN, and when it requests and sends packet communication, it is identified by the line switch 61 and requests connection to the packet switch 1162.The line switch 61 sends the packet to the packet switch 62. 3 by selecting the line by a common line signaling device (not shown).
The terminal is connected to a packet switch 62 through the selected line, and the packet switch 62 further performs connection control for setting up a call via the packet network to establish a connection with the other party's terminal.

When we learned from reports from terminals that line failures at the packet frame level were occurring frequently.

When a new terminal is installed, packet frame level (hereinafter referred to as frame tracing) is performed to search for failures and check terminal functions.

In the conventional method, you register the line number you want to trace, log all sent and received frames in memory, and output trace data after declaring the end of tracing, which is used as data to investigate what is happening at the frame level. Ru.

However, in the case of telephone network access to the packet switch 62 (access from the circuit switch 61), the line between the telephone network and the packet switch is selected by an unspecified number of subscribers (terminals). ) cannot specify the selected line. For this reason, conventionally it is necessary to register frame traces for all lines between the telephone network and the bucket switch.

[Problems to be Solved by the Invention] In the conventional frame tracing method described above, frame tracing is executed for all lines between a single line switch and a packet switch, and later necessary terminal communications are identified and related data is collected. It was necessary to identify and analyze the data, which required complex processing of huge amounts of data. Also, a large memory area was required to log frame trace data.

The present invention is a line frame tracing method in which, when a subscriber terminal number accommodated in a line switch that is the target of frame tracing is registered in a packet switch, frame tracing is performed for the line used by the corresponding subscriber terminal from origination to disconnection. The purpose is to provide

[Means to solve the problem] FIG. 1 is a basic configuration diagram of the present invention.

In FIG. 1, 10 is a subscriber terminal housed in a line exchange, 11 is a line exchange, 12 is a common line control device, and 13 is a subscriber terminal housed in a line exchange.
14 is a common line for common line signals; 15 is a packet switch;
6 represents a common line control device, and 11 represents a recording section.

When a telephone network subscriber accesses a packet switching network, the present invention uses transmission information transmitted by a common line control device between a circuit switch and a packet switch to trace the line used by a subscriber terminal that is to perform frame tracing. It identifies and traces the line frame at the point in time when the call is disconnected.

[Operation] When a maintenance person or the like of the packet switch 15 first inputs the subscriber terminal number accommodated in the circuit switch 11 that is the target of trace monitoring, the trace monitor registration unit 15
Registered in 2.

After this registration, when a subscriber terminal 10 accommodated in the two-line switch 11 makes a call to the packet switching network including the packet switch 15, the first line switch 11 analyzes the outgoing information and sends the call to the packet switch 15. Once this is known, the common line control device 12 selects an idle line from among the plurality of lines 13 provided between the line switch 11 and the packet switch 15. 112 sends a connection request signal including the line number of the selected line and the calling terminal number together with the information of the destination terminal of this outgoing call to the common line control device 16 on the side of the packet switch 15 via the common line line 14. be done.

The packet switch 15 receives this signal.

The line number and calling terminal number are extracted and stored in the reception information holding means 151. The packet switch 15 performs switching processing corresponding to the destination, and also inputs the terminal number registered in the trace monitor registration section 152 and the originating terminal number held in the reception information holding means 151 to determine the line to be traced by the tracing target line determination means 153. Determine at. That is, when all three terminal numbers fail, the line number stored in the reception information holding means 151 is outputted to the trace execution means 154 as the line to be traced. If no match is found, it will not be traced.

When the trace is executed by the trace execution means 154, all the frames transmitted and received through the designated line are extracted and recorded in the recording section 17.

After the trace is executed, a disconnection request is generated from the subscriber terminal IO, and a disconnection request signal including the line number and the originating terminal number is received by the packet switch 15 via the common line control device 12 of the line exchange 1ull, as in the case of 1 outgoing connection. Then, the received information is held in the received information holding means 151. These calling terminal numbers are compared in trace target line determination means 153, and if they match, they are supplied to trace execution means 154, and the frame tracing being executed is stopped.

[Embodiment 1] Fig. 2 is a configuration diagram of an exchange system in which the present invention is implemented, Fig. 3 is a sequence chart of connection/disconnection operations, Fig. 4 is a processing flow diagram of frame tracing, and Fig. 5 is an operation sequence of frame tracing. It is.

In FIG. 2, 20a, 20b, . . . are subscriber terminals, 201 is a line termination device, 21 is an I5DN compatible line switch, and 22 is a control signal between the packet switch and the No. 7 common line signaling protocol. Common channel signal controllers (ccs-cTL: common channel signal controllers) 23 and 24 that transmit and receive signals constitute a digital multiplex line, 23 is a large number of communication lines (including channels), 2
4 is one common signal line (including channel), 25 is a packet switch, 26 is a packet network, 27 is a packet 11
26 represents a subscriber terminal housed in 26.

The line exchange 21 controls the digital subscriber line of one interface (user/network interface according to the CCITT recommendation), and transmits and receives control signals such as call setup and disconnection between the exchanges using the common line control device 22. The packet switch 25 is notified via the common channel signal (CC3) line 124 at the time of call setup as to which of the many communication lines will be used for the connection extending from the circuit switch 21 to the packet switch 25.

The packet switch 25 includes packet link controllers (PLCs) 251, 253.
A packet processor (PPP) that performs packet transfer processing
) 252, a disk unit (DKU) 254 for storing packet accumulation and frame trace data, a console typewriter (CNS-TYP) 255, and the like. Then, the packet link controller 25
1253 notifies the packet processor 252 of packet signals and common line signals received from the digital multiplex line,
The bucket signal from the packet processor 252 and the common iI
Sends the J-line signal to the designated channel of the digital multiplex line.

Figure 3 shows a sequence chart of connection/disconnection operations.
This sequence is an example of an operation sequence for connecting/disconnecting a subscriber terminal of a line exchange and a subscriber terminal of a packet switching network in the switching system of FIG. 2.

In FIG. 2, control signals are transmitted and received between the subscriber terminals 20a, 20b, . . . and the circuit exchange 21 using the I5DN D channel protocol. ! 121 and the packet switch 25, and the packet switch and the other packet switch II (
The communication between the packet network and the subscriber terminal 27 is carried out according to the X475 protocol, and the communication between the packet network and the subscriber terminal 27 is carried out according to the X.25 protocol. Note that each of these protocols itself is a known protocol (communication control procedure) recommended by ccITT.

First, in order to execute a frame trace, the number of the subscriber terminal 2a shown in the figure accommodated in the circuit exchange 621 to which the frame trace is to be executed is registered from the console typewriter 255 of the packet exchange 25. This registration causes the data to be retained as frame trace request execution management data within the packet processor 252.

Next, the sequence chart of FIG. 3 will be explained by dividing it into a call setting operation and a call disconnection operation with reference to FIG. 2.

(2) Procedures when a call is set up (connected) between the subscriber terminal 20a and the subscriber terminal 27.

■The subscriber terminal 20a selects 9 outgoing signals (SE) as the communication type.
T-1lP) is transmitted to the line exchange 21.

■The line exchange 21 sends a 1 outgoing reception signal ((IILL-PR
OC), selects one of the free communication lines 23 between the two-line switch 21 and the packet switch 25, and sends an originating address signal (IAI) containing the line number and the originating subscriber terminal number to the packet. It is transmitted to the exchange 25. The communication line between the 3-line switch 2I and the packet switch e1125 is a line that can be selected by any subscriber accommodated in the 1-line switch 21, and the 1-line switch 21 generates an originating address signal (IAI). ), an idle line is acquired.

■Packet exchange 4!25 uses its originating address signal (I
It is checked whether or not the AI) is correct, and if it is normal, an address confirmation signal (ACM) and a connection completion signal (ANN) are sent to the line exchange 21 in order.

At this time, the packet switch 25 executes processing to start frame tracing. The processing flow is shown in FIG. 4 and will be explained later.

Also, the flag on the bus between the 1-line switch 21 (including the subscriber terminal 20a) and the packet switch 25 is the same! IJI 61
The packet switch 25 performs the setting (synchronization by continuously transmitting the flag 01111110'').

(2) When the line exchange 21 receives the connection completion signal (ANN), it transmits the connection completion signal (CONN) to the subscriber terminal 20a.

- When the subscriber terminal 20a receives the connection completion signal (CONN), it recognizes that a physical connection path has been established between the subscriber terminal 20a and the packet switch 25, and sends flag synchronization establishment to the subscriber terminal 20a and the bucket. Cross 111! [Do it for 25 minutes.

■The flags between the subscriber terminal 20a and the packet switch 25 are the same! After IJI bv is raised, the subscriber terminal 20a sets the link level to establish level 2 of the packet link.

Therefore, a SABM (Asynchronous Balanced Mode) frame is transmitted to the packet switch 25.

■The subscriber terminal 20a receives the UA from the packet switch 25.
When a frame (response frame) is received.

Packet exchange 104 for the outgoing packet signal! ! Send to 25. In this outgoing packet (CR), subscriber terminal 2
7 addresses are set.

■The packet switch 25 analyzes the outgoing packet signal (CR) from the subscriber terminal 20a, selects an empty line in the route to the packet network 26 in order to receive the call to the subscriber terminal 27, and The outgoing packet signal (CR) is sent to the packet switch.

(2) The packet switch in the packet network analyzes the received outgoing packet 7) signal (CR) and transmits the incoming packet (CN) to the called subscriber terminal 27.

[Phase] If the subscriber terminal 27 can accept one incoming packet signal (CN), it transmits a connection acceptance packet (CA).

(2) When the packet switch in the packet network receives a connection acceptance packet (CA) from the subscriber terminal 27.

A call connection packet (CC) is sent to the packet switch 25.

@Similarly, the packet switch 25 sends the call connection packet (
CC) to the subscriber terminal 20a.

From now on, the data packet 7 from the subscriber terminal 20a)
(DT) is transmitted to the subscriber terminal 27 via the packet switch 8125 and the packet switch in the packet network.

R3 Next, the procedure when the call between the subscriber terminal 20a and the subscriber terminal 27 is disconnected (call setting is canceled).

(2) The subscriber terminal 20a sends a call disconnection request bucket (CQ) to the packet switch 25.

■The packet switch 25 sends a call disconnection confirmation packet (CF)
is sent back to the subscriber terminal 20a, and the packet network 26
A call disconnection request packet (CQ) is sent to the call disconnection request packet (CQ).

■When the subscriber terminal 20a receives the call disconnection confirmation packet (CF), it transmits a disconnection (Disc) frame on the bus between the subscriber terminal 20a and the packet exchange [125] to disconnect the link level of the packet. do.

(2) When the packet switch 25 receives the disconnection (Disc) frame from the subscriber terminal 20a, it transmits a UA frame (response frame) to the subscriber terminal 20a.

■The subscriber terminal 20a sends a UA frame (response frame)
When received, a disconnection signal (DISC) is sent to the subscriber terminal 20a to release the physical bus between the subscriber terminal 20a and the packet switch 25.

(2) The subscriber terminal 20a sends a release signal (REL) back to the subscriber terminal 20a and also sends a disconnection (CLF) to the packet switch 25.

(2) The subscriber terminal 20a transmits a release completion signal (REL-COM) to the 9-line exchange 21.

(2) The packet switch 25 transmits the &11 signal (R1, G) in response to the disconnection signal (C1, F) from the two-line switch 21. At this point, the packet exchange tA with the line switch 21
The bus (line) between machines 25 becomes vacant.

At this time, the packet switch 25 executes processing to stop frame tracing. The processing flow is shown in FIG. 4 and will be explained later.

■Meanwhile, at this point, when the packet network 26 receives a call disconnection request (CQ) from the AC machine 25, a call disconnection confirmation packet (CF) is sent to the subscriber terminal 27.
to be sent back.

In the frame trace processing flow shown in Figure 4,
A is a process flow diagram for starting a frame trace, and B is a process flow diagram for stopping a frame trace.

First, in the case of A, as mentioned in the sequence chart in Figure 3 above, when an IAI signal (originating address signal) is received from a single-line exchange using the common line signaling protocol (combined with the D channel protocol), this process is performed. is started, and first extracts the IAI signal central communication terminal number (in the example of FIG. 2, the number of the subscriber terminal 20a) (step 40).
). Next, it is determined whether the extracted calling terminal number matches the terminal number registered in advance in the frame trace request execution management button in the bucket processor PPR (step 41).

If the two match, step 42) extracts the line number included in the IAI signal and sends a frame trace start instruction to the packet link controller (PLC) with the line number to be traced. The information is transmitted (step 43), and this process ends. In step 41, the process also ends if a comparison cannot be found.

Next, the frame trace termination process shown in B in FIG. 4 will be explained. This process starts when a CLF signal (disconnection signal) is received from the two-line switch according to the common line signal protocol, and when this signal is received, The line number included in the signal (the line number between the circuit switch and the packet switch) is extracted (step 45), and it is determined whether or not the line number is the same as the line number on which the frame trace is currently being executed (step 46). The line number under execution of this frame trace is recorded as being under execution when the instruction to start the frame trace was issued in step 43 of A above, and can be determined by comparing it with each line number marked as under execution.

After one defeat, the packet link controller (PLC)
, an instruction to stop frame tracing is sent along with the line number to be stopped.

FIG. 5 shows the operation sequence of frame tracing. The PLC in the figure is the packet link control device 251.
PPR is the packet processor 252. of FIG. DKU represents disk unit 254 in FIG.

Packet link controller (PLC) is a bag.

Upon receiving an instruction to start frame tracing (step 43 in FIG. 4) from the toproscenosa CPPR).

Executes a frame trace for the specified line. In this example, the frame of the designated line is illustrated as "Frame 1."

The packet link control device logs (accumulates) all the frames transmitted and received over the line specified to be traced (the line between the circuit switch and the packet switch) in memory, and when a predetermined amount of data is accumulated, Packet Pro Sensor (
When frame trace data is notified to PPR), the packet processor logs it to the disk unit (DKU). This operation is repeatedly executed, and in the packet processor (PPP), when an instruction to stop frame tracing (step 46) is input to the packet link controller (PLC) through the process of B in FIG. Stop frame tracing for line number.

The registration of the subscriber terminal that should execute frame tracing is done by inputting a command from the console typewriter and storing it in the frame trace request execution management button, and the deletion (cancellation) of the registration is done by inputting a command to delete it. process, directly notify the packet link controller (PLC) to stop the frame trace being executed, and delete the subscriber terminal number to be deleted from the frame trace request execution management data of the packet processor (PPP). This is done by

[Effects of the Invention] According to the present invention, it is possible to collect trace data only from specified subscriber terminals, and as there is no need for extra memory capacity unlike in the past, economy can be realized. Since data from other terminals is not imported into the device, the data can be viewed more easily.

[Brief explanation of drawings]

FIG. 1 is a basic configuration diagram of the present invention, FIG. 2 is a configuration diagram of an exchange system in which the present invention is implemented, FIG. 3 is a sequence chart of connection/disconnection operations, and FIG. 4 is a processing flow diagram of frame tracing. FIG. 5 is a frame tracing operation sequence, and FIG. 6 is an explanatory diagram of a conventional example. In Figure 1. 10: Subscriber terminal 11: Line exchange 12. 16: Common line control device 13: Communication line 14: Common line line 15: Packet switch 17: Recording section

Claims (1)

[Claims] In a line frame tracing method for a packet switch that transmits and receives call control signals to and from a telephone network using common line signals, the terminal number of the telephone network for which line frame tracing is desired is registered in the packet switch, and When a call is set up to a packet switch, when the calling signal information including the calling terminal number and line number sent via the common line signaling device is received, it is checked against the registered terminal number, and if it matches, the frame trace of the line number is recorded. When it receives a disconnection signal sent via the common line signaling device when a call is disconnected, it compares the terminal number found from the line number in the disconnection signal with the registered telephone network terminal number and stops the frame trace that matches. A line frame tracing method characterized by: