KR100428725B1 - Two-step self loopback test system and method in the recorded announcement equipment of a digital mobile switching center, especially concerned with conveniently executing the testing and maintenance of a circuit pack by configuring a self loopback test circuit in two steps - Google Patents

Abstract

PURPOSE: A two-step self loopback test system and method in the recorded announcement equipment of a digital mobile switching center is provided to increase productivity and reliability by configuring a self loopback test circuit even for the end point of the A/D pulse modulation subhighway path of a circuit pack and simplifying the testing and maintenance of the circuit pack through the two-step self loopback test. CONSTITUTION: In the case of transmitting, the A/D pulse modulation data of SHW0(subhighway 0) are outputted to the channel 0 of a differential drive(36) through an A/D pulse modulation decoder(31), a tri-state buffer(32), a buffer(33), and a de-flipflop(34). The A/D pulse modulation data of SHW1 are outputted to the channel 1 of a differential drive(45) through a tri-state buffer(37), a buffer(38), and a de-flipflop(39). In receiving, the A/D pulse modulation data of SHW0 are inputted through buffers(44,43) and a shifter register(42) via the channel 1 of a differential drive(45). The A/D pulse modulation data of SHW1 are inputted through the shifter register(42) via the differential drive(45) and a buffer(46).

Description

Apparatus and method for two-stage self-loopback test of digital mobile communication switch recording guide

The present invention relates to a two-stage self-loopback test apparatus and method of a digital mobile communication switch recording guide device, and in particular, a self-loopback test device of a digital mobile communication switch recording guide device is configured in two stages to test and maintain a circuit pack. The present invention relates to a two-stage self-loopback test apparatus for digital mobile communication switch recording guides designed for simplicity.

In general, the self-loopback test circuit of a conventional recording guide does not include all pulse-coded modulated sub-highway paths in the circuit pack, so even if the loopback test is satisfactory, the circuit-packed pulsed modulated (PCM) sub-highway path is tested. It could not be done completely.

Referring to the drawings, as shown in FIG. 1, the A / D pulse code modulation scheme decoder 11 which is a SHWO path among the paths of the pulse modulation subhighway in the circuit pack and the A / D pulse code Buffers 12 and 15 serving as buffers of the signal received from the modulation scheme decoder 11; De-flip flops 13, 16, and 17 for triggering and outputting signals from the buffers 12 and 15 serving as buffers; and shift registers 18 for shifting right or left by signals from the input terminal. And a differential drive, receiving 14 and 20, which divides all the signal lines in two.

When explaining the present invention configured as described above with reference to FIG.

A / D pulse code modulation data of subhighway 0 is transmitted to the subhighway 0 channel of the differential drive 14 through the A / D pulse code modulation method decoder 11, the buffer 12, and the flip-flop 13. The A / D pulse code modulation system data of subhighway 1 is output to the subhighway 1 channel of the differential drive 14 through the buffer 15 and the flip-flop 16. Upon reception, the pulse code modulation method data of subhighway 0 is input through the buffer 19 and the shift register 18 through the 0 channel of the differential receive 20, and the pulse code modulation method data of the subhighway 1 is differential receive ( 20 is input via the buffer 19, the shift register 18.

The first loopback test circuit of the first stage is looped back through the deflip-flop 17 through the shift register 18 in the A / D pulse code modulation scheme decoder 11 and the buffer 12 in the case of the subhighway 0.

Thus, the loopback device of the conventional recording guide device does not include all the pulse-coded modulation subhighway paths in the circuit pack, so even if the loopback test is satisfactory, the test of the pulse-code modulation subhighway path of the circuit pack is completely executed. There was a problem that it was difficult to check whether all the data was returned because there was a limit on the capacity of the buffer.

The present invention has been made to solve this problem, and is a tri-state buffer (32, 37) operated by input / output and enable signals in a drive unit and a receiving unit which are self loopback test circuits of a conventional recording guide apparatus and interface with a time switch. )Wow; When the self test is required in the tri-state buffers 32 and 37, a 2-step self loopback test circuit is formed in the loop buffers 35, 40, 44, and 46 that open the loop enable test. Reliability is characterized by the testing and maintenance of circuit packs through testing.

Since the configuration of FIG. 2 is the same as that of FIG. 1, it is omitted.

Referring to FIG. 2, the loopback test circuit of the recording guide apparatus of the present invention is described as follows.

During transmission, A / D pulse modulation data of subhighway 0 is passed through the A / D pulse modulation decoder 31, the tri-state buffer 32, the buffer 33, and the flip-flop 34. The A / D pulse modulation method data of the subhighway 1 is outputted to the channel 1 of the differential drive 45 through the three-state buffer 37, the buffer 38, and the flip-flop 39. Upon reception, pulse modulation method data of subhighway 0 is input through buffers 44 and 43 and shift register 42 through channel 0 of differential receive 45, and pulse modulation method data of subhighway 1 is differential. It is input via the shift register 42 via the receive 45 and the buffer 46. The self-loopback test circuit of the first stage is a deflip-flop (41) through the A / D pulse modulation decoder 31, the tri-state buffer 32, the buffers 33 and 43, and the shift register 42 for the subhighway 0. In the case of subhighway 1, the loopback is performed through the tri-state buffer 37, the buffers 38 and 43, and the shift register 42 to the flip-flop 41.

In addition, the self-loopback test circuit of the second stage uses the A / D pulse modulation decoder 31, the tri-state buffer 32, the buffer 33, the flip-flop 34, and the buffer 35 in the case of the subhighway 0. Through channel 2 of the differential drive 36, the channel is input to channel 0 of the differential receive 45 and looped back to the buffers 43 and 44, the shift register 42, and the flip-flop 41. In the case of the third state buffer 37, the buffer 38, the flip-flop 39, the buffer 40 through the channel 3 of the differential drive 36 is input to the channel 1 of the differential receive 45 Loop back to buffer 46, shift register 42, and flip-flop 41.

Therefore, the loopback test circuit of the conventional recording guide apparatus does not test all the paths of the A / D pulse modulation subhighway in the circuit pack, but it can be used at the end of the A / D pulse modulation subhighway path of the circuit pack. By constructing the loop back test circuit, the A / D pulse modulation subhighway path of the circuit pack can be easily tested and maintained through the loop back test in two steps, thereby improving productivity and reliability.

1 is a circuit diagram of a self loopback test apparatus of an existing recording guide apparatus,

2 is a circuit diagram of the present invention.

Explanation of symbols on the main parts of the drawing

11,31: A / D Field Coded Modulation Decoder 12,15,19,33,38,43: Buffer

13,16,17,34,39,41: deflip-flop 18,42: shifter register

35,40,44,46: Loop buffer 14,36: Differential drive

20,45: Differential 32,37: 3 state buffer

Claims (2)

A loopback test apparatus of a recording guide device, comprising: an A / D pulse code modulation decoder (11) which is a SHWO path among paths of a pulse modulation subhighway in a circuit pack; Buffers 12 and 15 serving as buffers of the signal received by the A / D pulse code modulation scheme decoder 11; and triggering and outputting signals from the buffers 12 and 15 acting as buffers. Flip-flops 13, 16 and 17; A shift register 18 for shifting right or left by a signal of the input terminal and a differential drive and a receiver 14, 20 for dividing all the signal lines in two; Three-state buffers 32 and 37 operated by input / output and enable signals; In the three-state buffer (32,37) of the digital mobile communication switch recording guide device comprising a loop buffer (35, 40, 44, 46) to open a loop enable test when the self test is required Two stage self loopback tester. In the loop back test method of the recording guide apparatus, in the case of subhighway 0, the A / D pulse modulation decoder 31, the tri-state buffer 32, the buffer 33, the deflip-flop 34, the buffer 35 Through the channel 2 of the differential drive 36 and input to the channel 0 of the differential receive 45 and loop back to the buffers 43 and 44, the shift register 42 and the flip-flop 41. Highway 1 passes through tri-state buffer 37, buffer 38, deflip-flop 39, buffer 40 to channel 1 of the differential receive 45 through channel 3 of the differential drive 36. And a loop back test with a buffer (46), a shift register (42), and a flip-flop (41).