JPS58127449A - Packet terminal testing system - Google Patents

Abstract

PURPOSE:To attain the same protocol test as the case of the use of an exclusive line to a terminal using under the prerequisite of storage to a pcaket exchange network, by providing an adaptor between the terminal and a line exchange network. CONSTITUTION:A packet terminal 1 is connected to a line exchange network 5 with less transmission delay time and to a test device 2 via the network 5. Adaptors 31, 32 are placed between line terminators 41, 42 and the terminal 1 or the test device. In hooking up a handset for dialing, a remote party is called and a channel is set according to the connection controlling procedure specified with the interface of a line exchange service between the adaptors 31 and 32.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a packet terminal testing method, and more particularly to a method for performing a protocol test on a node terminal by installing an additional device between the terminal and a circuit switching network.

In a circuit-switched network, data is transferred by setting a communication path between ingress and egress lines using a selection signal, so data can be sent and received instantly with only a delay in propagation time.

In contrast, in a packet-switched network, a message is divided into packets (blocks), the destination and other control information necessary for forwarding the message are added to each block, and the message is forwarded block by block via store-and-forward. Therefore, the open time of each exchange cannot be seen, and the transmission delay time varies greatly depending on the number of exchanges relayed.

As a method to test the protocol (communication protocol) of a packet terminal connected to such a packet switching network and using high-level transmission control (HDLC) procedures, there is a conventional method (1).
) There are two methods: installing a testing device in the same location as the packet terminal and directly connecting the two, and (2) installing the testing device in a location different from the packet terminal and setting up a transmission line between the two. There is a method and method for testing through the transmission line.

Protocols are also hierarchical due to differences in their control functions, with electrical and physical level protocols determining values such as voltage and current at the lowest level, and then frame level, packet level, host level, etc. Sarani user
There are various protocols such as levels. Here, it is assumed that it is sufficient to be able to test protocols at the frame level or higher, rather than fine control of voltage and current values.

Among the conventional test methods mentioned above, α) the method of installing at the same location requires the packet terminal and the test equipment to be installed in close proximity, so it may be necessary to move one or both of them, making it impossible to move them. In some cases, it becomes a constraint condition.

In addition, (2) method of installing in different locations (1) For example, in a test when a packet terminal joins a packet network, or in a test to analyze the cause of a failure that occurs during operation after joining the network.

Since it is impossible to distinguish between failures within the network and failures on the terminal side, it is necessary to set up a dedicated transmission line just for terminal testing.

Furthermore, as another test method, there is a method (3) in which the packet terminal is accommodated in the packet network and the test is performed by connecting the terminal and the test equipment via the packet network. As with method (2) above, it is difficult to isolate the fault due to the intervention of
Either it takes a lot of time to analyze the cause, or it requires a dedicated line that directly connects the terminal and the test equipment.

The purpose of the present invention is to eliminate these conventional drawbacks by providing terminals that are intended to be connected to a packet-switched network without using a leased line, and to perform the same tests as when using a leased line. It is an object of the present invention to provide a packet terminal testing method that is capable of identifying protocol abnormalities when connected via a packet network.

In order to achieve the above object, the packet terminal testing method of the present invention is a method for testing the protocol of a terminal connected to a packet switching network, in which the terminal under test is connected to a testing machine via a circuit switching network, and An additional device is inserted between the above terminal and the circuit switching network, and between the above test device and the circuit switching network, and the circuit switching network is controlled by the additional device (according to the connection control procedure specified in the circuit resistant service interface). (b) setting up a communication path between the additional devices via the
Next, set up a communication path between the terminal, the test machine, and each additional device to complete the communication path between the terminal and the test machine (C
) A feature is that a protocol test at a frame level or higher is performed by directly transmitting transmitted and received frames through the communication path.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a connection diagram of a packet terminal testing system showing an embodiment of the present invention.

In Figure 1, 1 is a packet terminal (terminal under test), 2 is a packet terminal (terminal under test),
31, 32 are additional devices, 41 and 42 are line termination devices, 5 is a circuit switching network, and 6 is a communication path within the circuit switching network.

As mentioned above, if a test is performed by connecting the terminal 1 and the test device 2 via the packet network while the terminal under test 1 is accommodated in the packet network, the delay time of the transmission frame will be extremely large, and the timing conditions etc. Therefore, in the present invention, the protocol test is performed by connecting the Kerat terminal 1 to a circuit switching network 5 with a small transmission delay time and connecting it to the test device 2 via the circuit switching network 5.

Normally, when connecting a terminal to the circuit-switched network 5, a modem (
However, in the present invention, as shown in FIG. be installed in between.

When communicating between terminals connected via the circuit-switched network 6, first pick up the handset, dial, call the other party, and follow the connection control procedure specified in the circuit-switched service Inc. 7 Ace. Therefore, a communication path is set up, and in the test method of the present invention, these operations are performed between the additional devices 31 and 32.

The additional devices 31 and 32 have the following functions. That is, (a) according to the connection controller (IK) defined in the circuit switching service interface.

(b) A function to set up and then release the communication path between the additional devices 31 and 32 via the circuit switching network 5; (b) a function to set up and then release the connection between the packet terminal 1 and the test device 2; , and (c) After the communication path between the packet terminal 1 and the test device 2 is set up, it is a function that allows transmitted and received frames to pass through.

FIG. 2 is a block diagram of the additional device shown in FIG. 1.

In FIG. 2, reference numeral 11 indicates a line connection control unit in the interface of the circuit switching service, such as a line connection control unit based on a synchronous X series interface, 12 a transmission circuit, and 13
14 is a receiving circuit, 14 is a terminal connection control unit between the packet terminal 1 or the test device 2 based on the connection line of the synchronous X series interface and its operation in the interface of the packet switching service, and T1+TI is the CC
The transmission line specified in ITT Recommendation X24, “le i,”
Similarly, C1eCl indicates the control line, and 11°=I indicates the induction line.

3 and 4 are diagrams showing the respective operation sequences of the line connection control section of the terminal-side additional device in FIG. 2 and the line connection control section of the test machine-side additional device, and FIG. FIG. 4 is an operational state transition diagram of the terminal connection control unit of each additional device in the figure.

Taking as an example a case in which a test is requested from the packet terminal 1@, explanation will be given with reference to FIGS. 2 to 5.

α) First, a communication path 6 is set up in the line switching network 5 between the line connection control unit 11 of the additional device 31 and the line connection control unit 11 of the additional device 320. The operations of the line connection control unit 11 of the additional device 31 at this time are as shown in FIG. As shown in FIG. 3, in response to a call request, T changes from 1'' to ``O'' Ic, and C2 changes from off to on, and after synchronization character [5YNJO, sends a partner machine selection signal and waits for connection. Rts in Figure 3
I*(Receive Ma from circuit switched network 6 to additional device 31
t, signal flowing on the initiation edge I), in the ready state, R8 is 11''+L1 is off, but by making one call request, the synchronization signal indicating that the selected Oi signal can be sent to R. The character ``8YNJ'' is received continuously, and the connection is completed, so the character ``!'' changes from off to on.

On the other hand, the line connection control section 11 of the additional device 32 on the testing machine 2 side
The operation of R8 is in the ready state as shown in R*pIt (a signal flowing from the circuit switching network 5 to the additional device 32 on the receiving line R1v and induction line l) in FIG.
*111, I, is off, but due to an incoming call from the terminal side, the synchronization character [5YNJ
The bell signal ``BELJ'' is received by R1. As a result, the signal shown in FIG. Acceptance of the call is confirmed by turning C1 from OFF to ON.Then, when I changes from OFF to O/, the connection is completed.

Further, for more detailed operation, refer to "Circuit Switched Service Interface" or ccI'r'r Recommendation x.

21.

Finally, when the setting of communication path 6 is completed between fi 131 and fi 32 after addition and one communication becomes possible, addition & placement 31, 32
By monitoring X*ta, it can be determined that communication is now possible. Further, the operator can be notified by displaying a lamp (■) indicating the ON state of the line (K).

(2) Additional devices are connected to each other, and additional device IIIL3
When the I line of 1°32 is turned on, the additional device 31.32
x+ It is turned on 111 under the control of the terminal connection control unit 14 in the terminal. This is the DCE ready state shown in FIG. 5(a).

The method of displaying the state transition diagram in Fig. 5(a) is as shown in Fig. 5(b).
As shown in the figure, the state name is in the upper half of the circle, and the T is in the upper left of the lower half.
, the signal on top, the signal on R1 on the bottom left, the signal on C1 on the top right, the signal on C1 on the bottom right! , the upper signals are in on/off state (O
N, 0FF) and an irrelevant state (-).

DTE on the arrow line indicates the packet terminal 1 or test device 2, and DCK indicates the additional device 31, 32, respectively.
This indicates that they are factors in favor of transition.

As mentioned above, by DCE (additional equipment) K! .

is turned on and the state changes from DCE Not Ready to Ready, and when packet terminal 1 and test device 2 turn on the C, line, the 5ctlliscs line, ■, line,
■ Since all the lines are in the on state, the additional device 31,
32 transmitting circuits 12. The receiving circuit 13 is turned on.

As a result, the transmitting circuit 12 shifts to a state in which information sent to the circuit switching network 5 side is passed through, and the receiving circuit 13 passes information from the circuit switching network 6 through. In FIG. 5(1), a transition has been made from the DCE ready state to the communicable state.

(3) Next, as a through line is set up between the packet terminal 1 and the test device 20 via the circuit switching network 6 according to (1) and (2) above, any information can be exchanged between the packet terminal 1 and the test device 2. can be sent and received, and the protocol of the packet terminal can be tested. In Figure 5 (,), the state has transitioned from the communication enabled state to the data transfer state -'r, l
Data (D) is transferred onto R1.

(4) When the test is finished and it is necessary to disconnect the line, the packet terminal 1 or test device 2 turns off the CI line and moves from the data transfer state to the DCIC ready state as shown in Figure 6(a). . Terminal connection control unit 1 of additional equipment #31.32
4 monitors C8 and notifies the operator if it turns off. Who is the operator?

The line connection control unit 11 is activated to disconnect the communication path, end the test, and return from the DCE ready state to the DCE not ready state.

In addition, in the data transfer state of FIG. 5(,), when the additional devices 31 and 32 turn off 11, the DCK not ready state occurs.

In this embodiment, it is assumed that the line connection control units 11 of the additional devices 31 and 32 operate based on the synchronous X series interface in the interface of the line switching service, and the terminal connection control unit 11 operates based on the synchronous X series interface in the interface of the line switching service. Although the operation is based on the connection line and operation of the synchronous X series interface in the interface of By connecting the line termination equipment [41] included in the terminal 1 connected to the additional device, protocol tests of various terminals can be performed.

In addition, for example, in the examination when joining a terminal, etc.

If a terminal is accommodated in a packet network from the beginning, if there is a protocol abnormality in that terminal, it may have an adverse effect on the packet network, but in the present invention, the protocol test of the terminal is first performed via a circuit-switched network. conduct.

Since the packet is accommodated in the packet network after confirming that there are no abnormalities, the above concerns are completely eliminated. Furthermore, when testing the protocol of a terminal via the same-line switched network, testing can be performed in exactly the same way as using a leased line, so testing equipment at a remote location can be used.

In addition, it is economical because there is no need to set up a dedicated line for testing between the terminal accommodated in the packet network and the test device.

As explained above, according to the present invention, by installing an additional device between the terminal and the circuit-switched network, when a dedicated line is used for a terminal that is intended to be accommodated in a packet-switched network, It is possible to carry out exactly the same protocol test as , and then connect via a packet network to easily isolate protocol abnormalities.

[Brief explanation of the drawing]

FIG. 1 is a connection diagram of a packet terminal test system showing an embodiment of the present invention, FIG. 2 is a configuration diagram of the additional equipment shown in FIG. 1, and FIG.
Figure 4 is an operation sequence chart of the line connection control unit in the terminal-side additional device and testing machine side additional device in Figure 2, respectively, and Figure 6 is the operational state transition of the terminal connection control unit in each additional device in Figure 2. It is a diagram. 1: Packet terminal, 2: Test device, 31.32: Addition device, 41.42: Line termination device, 5: Circuit switched network, 6: Communication path of circuit switched network, 11: Line connection control unit, 12: Transmission Enclosure, 13: Receiving circuit, 14: Terminal connection control section, T,
F”!’ Transmission line, RI * R*: Reception line, CI
e CI "Control line, I,, I.: Indication line. Figure 3, Figure 4, Figure 5 (a)

Claims (1)

[Claims] In a method for testing the protocol of a terminal connected to a packet-switched network, the terminal is connected to a test device via a circuit-switched network, and additional devices are installed between the terminal and test device and the circuit-switched network. (b) Next, the terminal and the test Set up a communication path between the terminal and each additional device to complete the communication path between the terminal and the test device, and (C) directly transmit sending and receiving frames through the communication path to perform a protocol test at the frame level or higher. A packet terminal test method that is characterized by performing the following.