Solution to a program-controlled switch Fault Using RF restart Command Group

Fault types that can be solved by the RF restart Command Group in a Programmable switch

The restart command can solve the following fault types:

First, the software operation failure is caused by some interference of the switch;

Second, when the switch system enters the maintenance application stage, the maintenance operator's maintenance level is faulty or the fault is caused by some misoperation of the user;

Third, the impact of environmental factors on vswitches.

The following lists some fault phenomena that can be solved by the restart command:

1. A fault occurs when the software program runs due to some interference on the switch.

2. device faults caused by incorrect commands or data manually entered.

3. There is an unreasonable excessive central processing machine load.

4. high ambient temperature or relative humidity.

5. incorrect operations on user service functions.

6. Addressing Error faults. For example, the address number to be searched is greater than the actual address number range.

7. Software signal digital error.

8. data errors are caused by external interference signals or the "read" or "write" function of the I/O device.

9. Errors occur when data is transmitted over the bus and are not verified by the system.

10. Buffer registers are congested.

11. PABX capacity is insufficient.

12. Excessive traffic load or temporary high traffic.

13. functional blocks, software signals, address areas, and so on, which are input through human-machine interaction, do not actually have this content.

14. No current is detected in idle state.

15. Receive unoccupied confirmed signals or receive uncleared confirmed signals.

How to correctly use RF to restart the Command Group

In order to ensure the communication security of the switch system, prevent the impact of misoperations on the switch system, and minimize the impact of RF restart command groups on communication blocking, the usage level of the RF restart Command Group should be limited. Major faults should be handled by the competent engineers or technical backbone of the unit. At the same time, it is required to do the following work:

① Strengthen the publicity of necessary knowledge about the correct use of telephones, especially those with new service functions, for the users of programmable telephone switches, so as to reduce the occurrence of human faults.

② Strengthen technical training for switch maintenance personnel.

③ Maintenance personnel should be able to keep abreast of changes or data changes of user equipment and inter-office relay equipment throughout the network, and make timely and appropriate changes to relevant data.

④ Effectively perform system software maintenance, such as insisting on dumping the backup information.

⑤ Be cautious when using the restart command. It is best to do so at a low traffic volume, such as at noon or late at night. Table 1 lists the features and categories of the RF restart Command Group. Table 1 RF restart Command Group of MD110 Programmable switch

 

Manually restart the Programmable switch

To handle the fault of the MD110 Programmable switch, you can manually restart the Programmable switch by pressing the hardware button when using commands to restart the command group switch. The method is as follows: when the traffic volume is low at night, press the black button on the LPU board in the LIM with the IOU board twice to start the IOU board ), after the LIM central processor is reinitialized, the Programmable switch restarts globally and loads all data, which affects global communication.

By using the pressing hardware button, the program-controlled switch is physically restarted, and all the control programs and all the backup data are reloaded, the original information in the data storage is cleared at the same time. This adverse effect on communication caused by the re-installation of the backup information is more serious than the above method of restarting the command group switch using RF, the communication time is determined by the type of the storage media, such as a tape drive or hard disk, and the amount of the backup information. Generally, each LDH takes about 5 minutes. The time that affects the communication of the entire switch system is multiplied by the total number of luws configured, that is, N * 5. N indicates the total number of LIM instances configured for the switch system.

Because the process of global restart of the switch system and re-loading all the support information has a great impact on the communication quality, the number of executions can also be used as a standard to measure the design quality of the program-controlled telephone switch system and the product process or maintenance level.

According to our work practice, in the program-controlled switch capacity less than 1000 doors, such as domestic HJD-80 type Programmable switch, HJD-256 type Programmable switch, TGI-439 type Programmable switch, etc, because its command set contains a small amount of content, global re-initialization and data loading take a short time, which generally has little impact on user communication, therefore, you can often use the hardware button on the CPU Of the motherboard to physically restart the Programmable switch to eliminate the fault.

However, when the capacity of a Programmable switch is greater than 1000, such as an MD110 Programmable switch and an AXE-10 Programmable switch, because it takes a long time to restart and reload all the control programs and all the backup data, it takes a long time to affect communication, therefore, do not use the method of Manually restarting the program-controlled switch by group. Try to restart the program-controlled switch by using commands.

Summary of program-controlled switch faults:

There are many program-controlled switch faults, and the solutions are also one-to-one. software faults are typical of program-controlled switches. Therefore, readers must carefully and step by step to troubleshoot the faults, make sure that the command group for RF restart is correctly used.