KR100197413B1 - Apparatus and method for testing interface between packet handler and modem in a switching system - Google Patents

Abstract

In order to test a matching function between a packet handler (Packet Handler) for a packet switching service in a switchboard and a modem (MODEM) for connection with a PSPDN (Public Switched Packet Data Network) The present invention relates to a test apparatus and method capable of testing a modem matching function of an intra-exchange packet handler. In the Open Systems Interconnection (OSI) standard, three layers, that is, a network layer, an X.75 protocol for packet exchange (Link Access Procedure, Balanced) protocol, which is the data link layer, and the physical modem matching test, can be connected directly to the board to which the existing packet handler belongs. .

Description

Device and method for matching packet handler and modem in exchanger

FIG. 1 is a block diagram of a packet-handler-modem match test apparatus according to the present invention; FIG.

FIG. 2 is a flow chart showing a matching test procedure between a packet handler and a modem according to the present invention; FIG.

DESCRIPTION OF THE REFERENCE NUMERALS

100: computer terminal 200: matching test apparatus

210: first matching unit 220: packet protocol control unit

230: Layer 3 simulator section 240: Layer 2 simulator section

250: packet memory unit 260: modem simulator unit

300: Packet handler

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a Packet Handler and a Modem (MODEM) matching test apparatus in an exchange, and more particularly to a Packet Handler (PEM) (Open Access Interconnection) standard, the X.75 protocol for the packet exchange, which is the network layer, and the LAP-B (Link Access Procedure , Balanced) standard protocol, and physical modem registration of a packet handler and a modem in an exchange.

Generally, a packet handler for a packet switched service in an exchange performs an X.25 link level function, a packet level function, and an internal protocol processing function. The link level function handles the X.25, X.75, and LAP-B protocols, and the packet-level function sets and releases virtual calls, and assembles / disassembles data packets.

At this time, the LAP-B protocol uses a procedure similar to HDLC (High Level Data Link) as a link level protocol of a network and a network in X.75, detects a data error so as to enable reliable transmission between physical links It controls the flow of data. Therefore, if the data link layer operates correctly, error-free information transmission is possible in the upper layer.

Meanwhile, the X.75 protocol is a standard protocol of the packet network layer, and serves as an interface between an exchange for packet exchange and an exchange period. In order to allow information transfer between upper layers to be provided regardless of data transmission or exchange, It provides functions and procedures for controlling connection establishment, maintenance and release, and there are protocols corresponding to physical layer, data link layer and network layer.

Meanwhile, in the conventional test of the packet handler for time switch matching, it was necessary to use a protocol analyzing device (analyzer) capable of simulating the protocol to test the layer 2 and the layer 3 of the protocol for packet exchange. There is a problem that a separate matching board capable of selecting a speed conversion and a test channel must be provided.

In addition, conventional test equipment that can be tested by connecting directly to the packet handler was able to test only the clock generation and the loop function of the data.

Therefore, it is an object of the present invention to provide an apparatus and method for testing a physical connection for a packet protocol function and a modem connection by directly connecting to an existing packet handler without using the above-mentioned expensive protocol analyzing equipment and a board for matching with the equipment And an apparatus and method for matching a packet handler and a modem in an exchange.

The packet handler and modem match test apparatus in the exchange according to the present invention includes a modem connection function for performing packet exchange in an exchange with a computer terminal 100 for inputting a test command and outputting a test result, A first matching unit (210) for interfacing with the computer terminal (100); a second matching unit (210) for interfacing with the computer terminal (100); The second interface 210 is interfaced with the first matching unit 210 and performs test control of transmission and reception of packet data based on a test command and a packet call processing procedure from the first matching unit 210 to output a packet processing result to the first matching unit 210 A packet protocol control unit 220 for outputting the packet to the base station; A layer 3 simulator 230 for simulating the function of the packet layer according to a predetermined protocol corresponding to the layer 3 under the control of the packet protocol controller 220; A layer 2 simulator 240 for simulating the function of the layer 2 according to a predetermined protocol under the control of the packet protocol controller 220; A packet memory unit 250 for storing packet data from the layer 3,2 simulator unit 230 and 240 through the packet protocol control unit 220 and packet data from the packet handler 300 and outputting the packet data; And a modem simulator unit 260 that matches the packet handler 300 and simulates the function of the modem.

Meanwhile, a packet handler-modem match test method in an exchange according to the present invention is a simulation method for testing a match between a packet handler and a modem that performs packet exchange within an exchange and includes a modem matcher, ; Selecting a protocol to be tested; If the selected protocol is a predetermined protocol corresponding to layer 3, the call handler generates a call request packet to the modem matcher of the packet handler, determines whether a normal call connection response packet is applied from the modem matcher of the packet handler, 3; < / RTI > Generating a predetermined packet data and transmitting and receiving the packet data to and from the modem matching unit of the packet handler to test the functions of the order control and the error control; Selecting whether to automatically or manually test if the selected protocol is a layer 2 protocol; Transmitting / receiving a predetermined command to / from the modem matching unit of the packet handler to test setting / release of the data link; Transmitting the predetermined packet data to and from the modem matching unit of the packet handler to test the functions of the order control and the error control when the data link is normally set; And transmitting a predetermined data link command to the modem matcher of the packet handler based on an operation of the operator in the case of the manual test, and testing link state / link state and link state with the received response command.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram of an apparatus for testing a match between a packet handler and a time switch in an exchange according to the present invention. The computer terminal 100, the first matching unit 210 of the matching test apparatus 200, 220, a layer 3 simulator unit 230, a layer 2 simulator unit 240, a packet memory unit 250, and a modem simulator unit 260.

In the figure, the computer terminal 100 is a means for the test operator to input a test command with a predetermined key operation and to output a test result.

The first matching unit 210 of the matching test apparatus 200 is a means for a serial communication interface with the computer terminal 100 and typically uses an RS-232C standard interface.

In addition, the packet protocol control unit 220 is interfaced with the first matching unit 210 and performs trial control on transmission and reception of packet data based on a test command and a packet call processing procedure from the first matching unit 210, To the first matching unit (210).

On the other hand, the layer 3 simulator 230 simulates the function of the packet layer according to a predetermined protocol corresponding to the layer 3, that is, the X.75 protocol, under the control of the packet protocol controller 220.

The layer 2 simulator 240 simulates the layer 2 function according to a predetermined protocol, that is, the LAP-B protocol, under the control of the packet protocol controller 220.

The packet memory unit 250 stores packet data from the packet protocol controller 220 and packet data from the packet handler 300 from the layer 3,2 simulator unit 230 and 240 and outputs the packet data.

The modem simulator 260 matches the modem matcher in the packet handler 300 to simulate transmission and reception of packet data between the packet memory 250 and the packet handler 300, Consultative Committee on International Telegraphy and Telephony).

On the other hand, the packet handler 300 includes a modem matching unit for processing packet data such as packet command processing and assembly / disassembly of packet data, and for connection with an analog network, as a means for packet switching service in the switchboard.

Next, a detailed description will be given of a matching test process of FIG. 2, which is an operation process of the matching test apparatus according to the present invention including the above-described components, with reference to a flowchart.

First, the test operator uses the computer terminal 100 to initialize the modem simulator unit 260 with a predetermined command for physical matching between the modem access packet handler 300 and the modem and protocol test.

That is, a predetermined command is applied to the packet protocol control unit 220 via the first matching unit 210, and the packet protocol control unit 220 controls the modem simulator unit 260 to initialize the modem simulator unit 260 Step 200).

Next, the test operator selects a layer to be tested, that is, a packet protocol, using the computer terminal 100 (step 202).

At this time, if the X.75 protocol, which is the layer 3 protocol, is selected, the packet protocol control unit 220 controls the layer 3 simulator unit 230 to test initialization of the layer 3 (step 204).

In more detail, when the layer 3 simulator 230 generates a call request packet in the layer 3 using the X.75 protocol, the call request packet data is transmitted to the modem 300 via the packet memory unit 250, Modulated by the simulator unit 260 and transmitted to the modem matching unit in the packet handler 300.

Next, the packet handler 300 generates and transmits call connection response packet data in response to the call request packet data modulated and applied in the modem matcher 300 in the packet handler 300, and the transmitted call connection response packet data is transmitted to the modem The packet is transmitted to the packet memory unit 250 and the packet protocol control unit 220 through the modem simulator unit 260 of the test apparatus 200 to test whether the normal layer 3 is initialized.

Next, when the layer 3 is initialized through the above-described process, arbitrary packet data is generated in the layer 3 simulator unit 230 and is applied to the packet handler 300 through the process of transmitting the call request packet data The packet data transmitted from the packet handler 300 is applied to the packet protocol control unit 220 to test packet sequence control and error control functions, A call termination request packet is transmitted in step 230 to test whether the call is normally disconnected (step 206).

If the LAP-B protocol, which is the layer 2 protocol, is selected in step 202, the test operator selects whether to test automatically or manually through the computer terminal 100 (step 208).

At this time, if it is automatically selected, the layer 2 simulator 240 is controlled to test initialization of layer 2 (step 210).

In more detail, the packet protocol control unit 220 controls the layer 2 simulator unit 240 to transmit a set asynchronous balanced mode command, which is an unnumbered frame command, to the packet protocol control unit 220, The packet handler 300 through the packet memory unit 250, the channel selector 262 and the second matching unit 263 and receives an Unnumbered Acknowledgment (UA) command from the packet handler 300 The packet protocol control unit 220 determines whether the data link is normally established and initialized.

Next, when layer 2 initialization is performed through the above-described process, the layer 2 simulator 240 generates arbitrary packet data and tests whether the packet handler 300 is normally transmitted or received (step 212).

If the simulation of layer 2 is manually selected in step 208, the test operator inputs a desired data link command using the computer terminal 100, and receives the data link command (step 214).

Next, a command in a predetermined format corresponding to the input link command, that is, an unnumbered frame and an information frame, is generated by the layer 3 simulator unit 230 and is transmitted to the modem matching unit in the packet handler 300 The modem simulator 260 of the testing apparatus 200 tests whether the layer 2 is normally operated through the transmission / reception process (step 216).

As described above, according to the present invention, the matching between the modem matching unit and the modem for connection to the analog network in the packet handler for the packet switching service in the switchboard is performed by connecting the test apparatus 200 directly to the board having the packet handler It is easy to test.

Claims (2)

1. A simulation apparatus for testing a match between a handler (300) having a modem match function for connection with an analog network and a computer terminal (100) for inputting a test command and outputting a test result, A first matching unit 210 for interfacing with the computer terminal 100; The second interface 210 is interfaced with the first matching unit 210 and performs test control of transmission and reception of packet data based on a test command and a packet call processing procedure from the first matching unit 210 to output a packet processing result to the first matching unit 210 A packet protocol control unit 220 for outputting the packet to the base station; A layer 3 simulator 230 for simulating the function of the packet layer according to a predetermined protocol corresponding to the layer 3 under the control of the packet protocol controller 220; A layer 2 simulator 240 for simulating the function of the layer 2 according to a predetermined protocol under the control of the packet protocol controller 220; A packet memory unit 250 for storing packet data from the layer 3,2 simulator unit 230 and 240 through the packet protocol control unit 220 and packet data from the packet handler 300 and outputting the packet data; And a modem simulator unit (260) for matching the packet handler (300) and simulating the function of the modem. A simulation method for testing a match between a packet handler and a modem that performs packet exchange within an exchange and includes a modem matcher, the method comprising: initializing a modem simulation; Selecting a protocol to be tested; If the selected protocol is a predetermined protocol corresponding to layer 3, the call handler generates a call request packet to the modem matcher of the packet handler, determines whether a normal call connection response packet is applied from the modem matcher of the packet handler, 3; < / RTI > Generating a predetermined packet data and transmitting and receiving the packet data to and from the modem matching unit of the packet handler to test the functions of the order control and the error control; Selecting whether to automatically or manually test if the selected protocol is a layer 2 protocol; Transmitting / receiving a predetermined command to / from the modem matching unit of the packet handler to test setting / release of the data link; Transmitting the predetermined packet data to and from the modem matching unit of the packet handler to test the functions of the order control and the error control when the data link is normally set; Transmitting a predetermined data link command to the modem matcher of the packet handler based on an operation of the operator in case of manual test, and testing link state / link state and link state with a response command received; Matching test method of modem.