Application point of view: a comprehensive explanation of troubleshooting methods for programmable Switches

The Programmable switch is still quite commonly used. So I studied the troubleshooting method of the programmable switch and shared it with you here. I hope it will be useful to you. The HJD04 program-controlled switch and the public network of Posts and Telecommunications adopt the DOD1 loop relay network. All users cannot make an external phone call and are busy. At this time, observe the MFP on the Multi-frequency signaling processing board. The lamp used by the multi-frequency generator is always on a certain position.

Program-controlled switch failure phenomenon: When any user in this Bureau calls the 61XXX number, there is often a wrong number, and there is a regular, are all wrong to 65XXX, this layer is used by the mobile phone board ). Observe that the indicator lights of the dual-Tone Multi-frequency processor panel Flash 7 and configure a dual-tone processing board for normal operation ).

Analysis and repair: the fault is caused by a dual-Tone Multi-frequency processing machine (DTMP) Board Fault. One of the DTMP board functions is to send dial-up and dual-audio signals to user phones through the system network. The user listens to the dial-up sound normally and the error number does not appear the next time. Therefore, the user can eliminate common circuit faults such as The number generator in DTMP. Generally, the problem occurs on a set of Dual-sound generators. D-host 32 dual-sound generators per Board ). Remove the fault after replacing the DTMP board.

Program-controlled switch fault phenomenon: To a certain Bureau digital relay circuit call normal, digital into the relay group circuit is not available. No alarm is reported for the maintenance station and the total alarm box. After receiving the user report, go to "querying the current status of the relay circuit by Bureau" and observe that this group of digital relay circuits is closed.

Analysis and maintenance: This is generally caused by signal channels or transmission terminal equipment interference or transient changes in the terminal voltage caused by fluctuations in the interface level value and other reasons that cause the Bureau to automatically block the relay circuit. The solution is to run the release command on the maintenance platform.

Program-controlled switch failure phenomenon: at most bureau or digital relay circuit is not available. After entering "service operations-querying the current status of the relay circuit by Bureau", no reports are displayed and no alarms are reported.

Analysis and repair: Some data is lost during switchover. After the data is loaded again, it returns to normal.

Program-controlled switch failure phenomenon: Module 1, Module 2 host top yellow light, alarm buzzer sound. Go to "Environment query" to observe the running status of the power supply. The screen shows that the power supply blocks 0, 1, 2, 4, and 6 are normal green. The power supply Blocks 1, 3, and 5 generate alarms. The switch runs normally.

Analysis and maintenance: If the switch runs normally, a false alarm can be generated for the DDBC secondary power board. First, use a multimeter to measure the bus bar terminal on the DCB1 backplane of the rack. The output voltage is normal. At this time, the DDBC board reset key RT two needle seat) transient, the occurrence of a short harsh scream after the light off the bell. Transient RT initializes the DDBC board to eliminate error alarms. If an alarm is reported after the above operations are performed, the DDBC board fault should be considered and the DDBC board should be replaced.

Program-controlled switch failure phenomenon: Switch communication relay, the entire machine stops working. Observe the power frame and find that the "undervoltage warning light" is on. The input voltage of a power supply is-42V, and the allowable range of power supply is-43V ~ -56 V ).

Analysis and maintenance: the fault is caused by the undervoltage protection measures of the battery on the power shelf when the basic power supply voltage of the system exceeds the permitted range. Solution: Check and adjust the basic power supply voltage to the normal value, press the power record of the power rack, and manually press the rst key of the adtn board to reset, and then follow the detailed operation steps of HJD04 system startup and loading. After loading, the entire switching system resumes normal communication.

Program-controlled switch failure phenomenon: the audible and visual alarm signals in the total alarm box and the current system clock display are none. The maintenance station enters the "service operation" menu to observe, and the "module power supply operation diagram" is blank. The switch device runs normally.

Analysis and maintenance: the maintenance station can perform online operations, and the switch runs normally. This phenomenon should be caused by the failure to collect data such as the current clock, alarm information, and power running status in the maintenance station and the overall alarm box. It is found that two faults occur at the same time: 1) The overall alarm box TAB) to the RS232 chip in the maintenance of the serial communication. 2) Module 1 controls the DDBC board K2 to maintain the serial communication of the RS232 chip. After the two chips are replaced, the fault is eliminated after the program is loaded.

Program-controlled switch fault phenomenon: When a digital relay to a Mobile Communications Bureau frequently reports "component alarm-General error" alarm, but the communication is normal.

Analysis and maintenance: Check whether the equipment and signal channels at both ends are normal, and the false alarm is caused by the error information of the digital relay signaling processing board. Manually reset the DTP board of the digital relay signaling processor. After the reload, the fault disappears.

Program-controlled switch failure phenomenon: HJD04RM maintenance station shows "poor communication", observe Control Frame ICP Board indicator light stops at S0.1 position, MP board 0-7 indicator light flashes. The ICP Board and PC reset are invalid. Switch communication is normal.

Analysis and maintenance: the ICP Board is connected to the maintenance station through ports 2B + D to implement communication between the system and the maintenance station. The switch communicates smoothly, indicating that the system runs normally. The fault point should be between the ICP and the maintenance platform. After investigation, the fault is caused by the disorder of the ICP program due to the large power shock wave during the maintenance and maintenance of the protection station. Processing Method: plugging the ICP Board out so that it is completely powered off) and then inserting it. Then, reset the board and PC to eliminate the fault.

Program-controlled switch failure phenomenon: HJD04RM no bell flow output. Check the user cabinet. users in the same frame are not sent by Bell.

Analysis and maintenance: the segmented compression method is used. First, the output voltage of the Bell stream is normal on the RMDCB2 backplane: LL, but on the PCMB20C board UC16/UCI terminal, the bell-flow voltage is not measured, that is, the 1A fuse pipe of the board is regarded as bad. After the fuse pipe is changed, the system returns to normal.

Program-controlled switch failure phenomenon: whenever the room temperature is as low as 10 degrees, the "-5 V + 12 V" power plug-in of the HJD04RM power control cabinet sends an alarm message. At this time, the host is yellow, the plug-in "over-current" alarm light is on, the total alarm desk white light is on, and the component alarm is displayed.

Analysis and maintenance: in the power supply plug-in, the parameters of a thermal device used in the voltage output control end over-current protection circuit change, which is sensitive to temperature reflection. Once the room temperature drops, the system will work and cut off the output. If an alarm is generated, this is not a real power plug fault ). Troubleshooting method: After the room temperature is increased, the alarm will be cleared to return to normal.