KR100408077B1 - T3 channel service unit with test pattern device - Google Patents

Abstract

An object of the present invention is to provide a T-class channel service unit having a built-in test pattern device capable of transmitting and receiving a test pattern for testing a state of a T3 line, and checking the received test pattern to detect an error. In the T-3 channel service unit, the present invention provides a signal switching unit for receiving data to be transmitted and test pattern data and outputting one of the two signals to the T3 transmission line according to the operation control signal. A test to store one or more test patterns according to the present invention, receive a transmission clock, a pattern selection signal, and an error insertion control signal, insert an error according to the error insertion control signal into the selected test pattern, and output the signal to the signal switching unit according to the transmission clock. A test pattern is detected from the pattern generator and data received from the T3 transmission line, and within the detected test pattern It is a summary to include a test pattern detection unit for detecting and outputting the generated error.

Description

T-class channel service unit with built-in test pattern device {T3 CHANNEL SERVICE UNIT WITH TEST PATTERN DEVICE}

The present invention relates to a channel service unit provided at an end of a T3-class transmission line. More particularly, the present invention relates to a channel service unit for transmitting and receiving a test pattern for testing a state of a T3 line, and checking the received test pattern to detect an error. T-class channel service unit with a built-in test pattern device.

T3 is a North American circuit system. It is a transmission line that can transmit digital signals at a transmission rate of 44.746 Mbps per second. It has up to 672 channels and is used to construct a backbone faster than T1. At this time, the signal transmitted to the T3 line is called DS-3 (DIGITAL SIGNAL).

Such a T3 line is used to connect LANs constructed of a plurality of T2 lines or T1 lines, and at the end of the T3 line, a plurality of digital signals DS1 and DS2 transmitted to the T2 line or T1 line are appropriately T3. A channel service unit (CSU) is provided for converting a frame and extracting a plurality of digital signals DS1 and DS2 from a received T3 frame and transmitting the same to a corresponding line.

That is, as shown in Figure 1, the both ends of the T3 line 12 is provided with a channel service unit 11 is connected to a plurality of routers 13 connected to the end of the T2 class line, respectively.

In this network configuration, in order to test the abnormality of the main line, a commercial measuring device that generates a predetermined test pattern is connected to the line or the device, and the test code is transmitted and received on the line through the commercial measuring device to check the error of the line. It is determined whether the abnormality of.

At this time, the test pattern used uses international standards for interoperability.

However, as described above, in the past, a separate measuring apparatus must be installed from the outside to test the track, so that additional costs are incurred due to the preparation of separate test equipment, and inconvenient work is cumbersome every test. have.

The present invention has been proposed to solve the above-mentioned conventional problems, and an object thereof is a built-in test pattern capable of transmitting and receiving a test pattern for testing a state of a T3 line, and detecting an error by checking a received test pattern. To provide a T-3 channel service unit with a device.

1 is a block diagram showing the configuration of a network implemented by a T3 line.

2 is a block diagram showing the configuration of a T-3 channel service unit having a built-in test pattern device according to the present invention.

3 is a block diagram showing an internal configuration of a test pattern detection unit in the channel service unit of the present invention shown in FIG.

* Description of the symbols for the main parts of the drawings *

11: Channel service unit

12: T3 transmission line

13: router

21: signal switching unit

22: test pattern generator

23: test pattern detection unit

As a construction means for achieving the above object of the present invention, the present invention is a T-3 grade channel service unit,

A signal switching unit which receives data to be transmitted and test pattern data and outputs one of two signals to a T3 transmission line according to an operation control signal;

Stores one or more test patterns according to the standard, receives a transmission clock, a pattern selection signal, and an error insertion control signal, inserts an error according to the error insertion control signal into the selected test pattern, and outputs the signal to the signal switching unit according to the transmission clock. Test pattern generator; And

And a test pattern detection unit for detecting a test pattern from data received from the T3 transmission line, and detecting and outputting an error generated in the detected test pattern.

Hereinafter, with reference to the accompanying drawings will be described in detail with respect to the T-3 class channel service unit having a built-in test pattern device according to the present invention.

FIG. 2 is a block diagram schematically showing a configuration of a channel service unit according to the present invention, and receives one of transmission data and a test pattern to be output through a T3 transmission line and selects one of them according to a selection of a test mode or a normal operation mode. A signal switching unit 21 for selectively outputting the signal to the T3 transmission line, and a test pattern generator 22 generating a 2E-15 or QRSS pattern having a predetermined period according to the transmission clock and applying the same to the signal switching unit 21. And a test pattern detection unit 23 that receives the test pattern transmitted through the T3 transmission line and determines the line quality.

In the above, the test pattern detection unit 23 is configured as shown in FIG.

Referring to FIG. 3, the test pattern detector 23 detects a pattern in a T3 frame received from a T3 transmission line and synchronizes the pattern detected by the pattern detector 31 according to a reference time. A synchronization unit 32 and an error detection unit 33 for detecting and outputting an error in the pattern through the synchronization unit 32.

By the above configuration, when the channel service unit according to the present invention is to test the quality of the T3 transmission line, the channel service unit controls the signal switching unit 21 shown in FIG. 2 and outputs it from the test pattern generator 22. The test pattern is switched to output to the T3 transmission line.

In addition, the test pattern generator 22 operates to generate a test pattern. At this time, the test pattern generator 22 transmits a transmission clock, a selection signal, and an error insertion signal. The test pattern generator 22 selects one pattern among the patterns according to the selection signal, generates a pattern according to the selected pattern according to the transmission clock, and forcibly inserts an error into the test pattern according to the error insertion signal.

As described above, the test pattern generated in the test pattern generator 22 is defined to test the line quality with data having a certain period, and according to the international standard for interoperability, and the format is 2E-15 ⇒ X15. + X14 + 1 = 0, QRSS ⇒ X20 + X17 + 1 = 0. The test pattern generator 22 selects and generates one pattern from the two patterns according to the selection signal.

In addition, an error may be forcibly inserted into the track through the control of the error insertion signal.

As described above, the test pattern transmitted through the signal switching unit 21 is transmitted to another CSU through the T3 transmission line as shown in FIG. 1, and is then input to the test pattern detection unit 23 provided in the CSU. .

The test pattern detection unit 23 detects a test pattern from the received T3 data, and sends the detected test pattern to the pattern synchronization unit 32 and the error detection unit 33 to determine whether there is an error equal to or less than a set number within a reference time. Detect errors so you can

That is, if the error detected in the reference time by the test pattern detection unit 23 is within the set number, for example, 6 or less, it is determined that the quality of the line is at an appropriate level, the synchronization is declared, and within the reference time. If the detected error is more than the set number, it is determined that the track quality is bad.

The data received after synchronization is sent to the error detection unit, and used to detect an error generated when data is transmitted and received on the actual line, which is known to the user.

Therefore, it is possible to simply use a channel service unit having a test pattern generation function as a line quality measuring means without additionally expensive measuring equipment.

After the test is completed, it is determined to be normal, and when the actual data transmission starts, a control signal for operating in the transmission mode is sent to the signal switching unit 21 shown in FIG. 2, whereby the signal switching unit 21 The channel service unit performs an original function, that is, a function of transmitting and receiving data through the T3 transmission line while switching data is transmitted to the T3 transmission line.

The present invention, as described above, by sending a test pattern to the transmission line in the channel service unit which is the equipment provided at the end of the T3 transmission line, by receiving the transmitted test pattern to determine the quality of the transmission line, It is not necessary to provide expensive measuring equipment separately for the quality inspection of the furnace, and in addition, it is possible to test the track by adding a simple function in the existing channel service unit, thereby achieving a cost-effective effect. .

Claims (2)

In the T-3 channel service unit, A signal switching unit which receives data to be transmitted and test pattern data and outputs one of two signals to a T3 transmission line according to an operation control signal; Stores one or more test patterns according to the standard, receives a transmission clock, a pattern selection signal, and an error insertion control signal, inserts an error according to the error insertion control signal into the selected test pattern, and outputs the signal to the signal switching unit according to the transmission clock. Test pattern generator; And T-3 class with a built-in test pattern device, characterized in that it comprises a test pattern detection unit for detecting a test pattern from the data received from the T3 transmission line, and detects and outputs an error generated in the detected test pattern. Channel service unit. The method of claim 1, wherein the test pattern detection unit A pattern detector detecting a test pattern in a T3 frame received from a T3 transmission line; A pattern synchronization unit for synchronizing by determining whether an error less than or equal to a set value is detected within a reference time in the test pattern detected by the pattern detection unit; And T-class channel service unit having a built-in test pattern device, characterized in that the error detection unit for detecting an error from the data received from the T3 transmission line when the synchronization by the pattern synchronization unit.