Program-controlled switch Fault Analysis and Solution

Fault Analysis and Solution of Programmable switch, maintenance experience of JSQ-4000 type Programmable switch, JSQ-4000 is a type of digital time-controlled switch, using the distributed control mode, the number of users and relay of the port can be selected as needed and can be used as a user switch, a private network switch, or a C5 terminal switch.

EXT user programmable switch fault

The user interface board is the only interface directly connected to the extension user in the vswitch. each user has an independent user circuit, and the user circuit uses SLIC thick film Circuit) + COMDEC compiled code circuit ). If there is no dial-up sound on the terminal, first find the extension port on the distribution rack and disconnect the external line.) test and judge.

For the external side: if the user's external side is short or open, or the user's phone is broken, the disconnection may not have a dial-up sound. For the device side: when the extension port parameter is set incorrectly, the extension setting is only allowed to answer the call) there will also be no dial-up sound. If the call is normal without ringing on the phone, first find the extension port on the distribution rack and disconnect the external line.

For the external side: when the user's external line is open, mixed line, or ground gas is large, it can cause the phone to not ring or to only vibrate once. If the user's telephone ring circuit is bad, the phone should be replaced. Device side: the ring relay or the ring-related circuit of the port on the user board is broken. The user board should be replaced.

If the whole module user does not ring, the 0.75A fuse of the psuboard may be broken. the fuse of the same specifications or the module power supply that generates the bell flow must be replaced, or the psuboard should be replaced. The same module has several extension ports, but the pulse extension can be used to disconnect the dial tone, which may be the U2929EE010 chip on the MCPU board.

In addition, observe the indicators on the circuit board or listen to the sound to determine the fault, such as when calling the user, the relay has a "squeaking" vibration, most of them are caused by the fact that the capacitance between the outdoor cables is too large, the line insulation is poor, there are too many phones, and the phones are not good.

Relay Programmable switch fault

The relay interface is the port connecting the User Switch to the upper-level Bureau. The contact between the user and the external phone must be through the relay interface. I often hear the user report that "0" cannot be called out without silence) or call the switchboard for no response and no voice prompts that the switchboard is on duty ), first, on the distribution frame, determine whether the outgoing and incoming relay access switches are normal. If some outgoing relay ports do not have a dialing tone, please report it to the Telecommunications Bureau's 112 faulty units.

Short-circuited all incoming relay on the distribution rack, and then dialed the relay lead number or a single incoming relay number. If you can still hear the return tone, please contact the Telecommunications Board. Under normal circumstances of the local telephone Bureau, the above faults may occur:
◆ Poor individual ports on the trunk board. Replace the 3845 chip or the entire trunk board.
◆ The switch-side data is incorrect. If the relay data is lost or the entry and exit relay settings are incorrect.
◆ Wrong relay data is loaded.

It is worth mentioning that the user switch that uses loop relay will be disconnected and relay will be released in about 1 minute after a call is called out. Generally, the output relay has no anti-pole signal, however, the output relay parameter is set to "identification. Because the local software identifies the reverse polarity signal as a relay, if the switch occupies the active position of the relay program-controlled switch and fails to receive the reverse polarity signal within 1 minute, the relay is considered to be faulty, the relay cannot be released when the phone is connected. Therefore, do not set the relay signal to "identification" if the relay line does not have a reverse polarity signal ".

Programmable switch failure: the billing system does not receive a ticket

The billing system does not accept a ticket, which may be due to one of the following reasons.

◆ In the billing system, the parameter communication rate, communication serial port, and traffic record selection related to ticket receipt are related. Generally, choose Serial Port 1 as the serial port for communication. The serial port number for Long-city agriculture is selected as the traffic record. For the communication speed with NCPU board, select 9600 baud as the communication speed without NCPU board.

◆ The delay time limit of the billing system is set to be too long, for example, 999 s ).

◆ The switch cannot connect to the computer, but does not send a ticket. Generally, there is a problem with 96FS174 or 96FS175 on the ncpu board.

◆ The 422 card inserted on the computer has a problem and the switch cannot be connected to the computer. This problem is generally caused by a lightning strike on the switch or because the computer terminal is not in common with the switch, there is also a high voltage or high current electrical cable connecting the switch to the computer terminal, resulting in 422 card 96FS174, 96FS175 bad.

◆ Conflicts with the function switching of the Chinese character system used. For example, if the UCDOS Chinese Character pinyin or wubi input is switched back to the English state after ALT + F6, the billing system clock does not go. At this time, press the Space key or ESC key, the billing system clock will go, you can also normally receive the switch to send a ticket, this is a false crash.

◆ All Chinese character systems or operating systems have problems, such as software infected with viruses or pirated software.

◆ All billing system software and switch software are not supported.

◆ The cable connecting the computer terminal to the vswitch is broken. The flat cable from the 422 card to the serial port is broken. It is usually bitten or broken by a mouse.

◆ Set the billing function of the corresponding outgoing number in the maintenance console to disabled. Change it to enabled.