KR100197412B1 - Apparatus and method for testing interface between packet handler and time switch in a switching system - Google Patents

Abstract

The present invention relates to a packet handler (Packet Handler) for a packet switched service in an exchange and a time switch for exchanging a time slot on a multiplexed time division PCM (Pulse Code Modulation) highway The present invention relates to an apparatus and method for testing a packet handler and a time switch in an exchange so as to be capable of performing test. The OSI (Open Systems Interconnection) standard defines three layers, that is, X. 25 protocol and 2 layer, that is, a link access procedure (LAP-B) standard protocol, which is a data link layer, to the board on which the existing packet handler belongs.

Description

Test apparatus and method for matching packet handler and time switch in exchanger

FIG. 1 is a block diagram of an apparatus for testing a match between a packet handler and a time switch according to the present invention; FIG.

FIG. 2 is a flow chart illustrating a matching test procedure between a packet handler and a time switch 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: time switch simulator unit

261: clock generating unit 262: channel selecting unit

263: second matching unit 300: packet handler

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packet test equipment for packet handler and time switch in an exchange, In the Open Systems Interconnection (OSI) standard, three layers, that is, the network layer, the X.25 protocol for packet switching, and the second layer, that is, the data link layer The present invention relates to an apparatus and a method for testing a packet handler and a time switch in an exchange so as to test a function of a standard LAP-B (Link Access Procedure, Balanced) protocol.

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.

In this case, the LAP-B protocol uses a High Level Data Link (HDLC) protocol as a link level protocol between a packet user and a network in X.25. The LAP-B protocol detects errors in data Of the flow rate. Therefore, if the data link layer operates correctly, error-free information transmission is possible in the upper layer.

Meanwhile, the X.25 protocol is a standard protocol of the packet network layer, and serves as an interface between a terminal 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.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a packet handler and a packet handler in an exchange that can directly test a function of a packet protocol by directly connecting to an existing packet handler without the expensive protocol analyzing equipment and a board for matching with the equipment, And to provide an apparatus and method for testing the matching of switches.

A packet handler and time switch matching test apparatus in a switchboard according to the present invention is a computer terminal for inputting a test name and outputting a test result and a simulation device for testing a match between a packet handler and a time switch for packet exchange in an exchange A first matching unit for interfacing with the computer terminal; A packet protocol control unit interfaced with the first matching unit to test and control transmission and reception of packet data based on a test command and a packet call processing procedure from the first matching unit and output a packet processing result to the first matching unit; A layer 3 simulator unit 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 control unit; A layer 2 simulator for simulating the function of the layer 2 according to a predetermined protocol based on the control of the packet protocol controller; A packet memory unit for storing packet data from the layer 3,2 simulator unit through the packet protocol control unit and packet data from the packet handler and outputting the packet data; And a time switch simulator unit for generating a transmission / reception clock by matching with the packet handler and transmitting / receiving packet data between the packet memory unit and the packet handler on a predetermined channel based on the generated transmission / reception clock.

Meanwhile, a test method of a packet handler and a time switch in an exchange according to the present invention is a simulation method for testing a match between a packet handler and a time switch for packet exchange in an exchange, Selecting a protocol to be tested; If the selected protocol is a predetermined protocol corresponding to the layer 3, the call handler generates a call request packet, transmits the call request packet to the selected channel, determines whether a normal call connection response packet is applied from the packet handler, Testing; Generating a predetermined packet data and transmitting and receiving the packet handler to and from the selected channel when the initialization is normally performed, thereby testing the function 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 the packet handler and the selected channel if the automatic test is performed; Transmitting and receiving predetermined packet data to and from the packet handler when the data link is normally set, testing the functions of the order control and the error control; Transmitting a predetermined data link command, which is applied based on an operation of the operator, to the channel selected by the packet handler in the case of manual test, and testing link setting / release and link status 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, A clock generator 261 of the time switch simulator 260, a channel selector 262, and a clock generator 260 of the time switch simulator 260. The clock generator 262 of the clock generator 220, the layer 3 simulator 230, the layer 2 simulator 240, the packet memory 250, And a matching portion 263.

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.25 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.

Meanwhile, the time switch simulator 260 generates a transmission / reception clock by matching with the packet handler 300, selects a predetermined channel based on the generated transmission / reception clock, and stores packet data between the packet memory 250 and the packet handler 300 Simulates the time switch to transmit and receive.

Specifically, the clock generation unit 261 of the time switch simulator unit 260 generates a predetermined reference clock and a packetized frame clock as transmit / receive clocks.

The channel selection unit 262 synchronizes packet data from the packet memory unit 250 with a transmission / reception clock from the clock generation unit 261 to a predetermined channel selected by the control of the packet protocol control unit 220, To the second matching unit (263).

The second matching unit 263 is a means for interfacing the packet handler 300 with the channel selecting unit 262. The RS-422 standard method, which is typically a communication interface of the exchange, is used.

On the other hand, the packet handler 300 processes packet data such as packet command processing and assembling / disassembling of packet data as means for a packet switching service in an exchange.

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, when the test operator selects a time slot to be tested using the computer terminal 100, data on the selected channel is applied to the packet protocol controller 220 through the first matching unit 210, The controller 220 controls the channel selector 262 to select a channel on the time-divided sub-highway in the channel selector 262 (step 200).

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

At this time, if the X.25 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.25 protocol, the call request packet data is transmitted through the packet memory unit 250 through the packet memory unit 250, Divided into a predetermined channel selected by the selection unit 262, applied to the second matching unit 263, and transmitted to the packet handler 300 again.

Next, the packet handler 300 generates and transmits call connection packet data in response to the applied call request packet data, and the transmitted call connection response packet data is transmitted through the second matching unit 263 to the channel selection unit 262 ), The packet memory unit 250, and the packet protocol control unit 220 to test initialization of the normal layer 3.

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 inputted link command, that is, an unnumbered frame and an information frame is generated by the layer 3 simulator unit 230 and transmitted to and received from the packet handler 300, (216). ≪ / RTI >

As described above, according to the present invention, there is an effect that the matching between the packet handler and the time switch for the packet switching service in the exchange can be directly tested and connected to the board having the packet handler.

Claims (3)

A simulation apparatus for testing a match between a packet handler (300) and a time switch for exchanging packets in an exchange with a computer terminal (100) for inputting a test command and outputting a test result, A first matching portion 210; 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; A time switch simulator 260 for transmitting / receiving packet data between the packet memory 250 and the packet handler 300 on a predetermined channel based on the generated transmission / reception clock, And a time switch in the exchange. The time switch simulator (260) according to claim 1, further comprising: a clock generator (261) for generating the transmission / reception clock; A channel selection unit (262) for synchronizing with the transmission / reception clock and transmitting / receiving the packet data to a selected channel selected under the control of the packet protocol control unit (220); And a second matching unit (263) for interfacing the channel selector (262) and the packet handler (300). A simulation method for testing a match between a packet handler and a time switch for exchanging packets in an exchange, comprising: selecting a time slot as a channel to be tested; Selecting a protocol to be tested; If the selected protocol is a predetermined protocol corresponding to the layer 3, the call handler generates a call request packet, transmits the call request packet to the selected channel, determines whether a normal call connection response packet is applied from the packet handler, Testing; Generating a predetermined packet data and transmitting and receiving the packet handler to and from the selected channel when the initialization is normally performed, thereby testing the function 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 the packet handler and the selected channel if the automatic test is performed; Transmitting and receiving predetermined packet data to and from the packet handler when the data link is normally set, testing the functions of the order control and the error control; Transmitting a predetermined data link command, which is applied based on an operation of an operator, to a channel selected by the packet handler in a manual test, and testing link state / link state and link state with a response command received; Matching test method of time switch.