Eleven, Modem
Common faults 1: 56K MODEM can't go up to 56K
This problem can be considered from the following aspects:
1. The actual 56KMODEM maximum speed can only reach around 53k, considering various effects, 56kmode speed is generally between 45-53K.
2. The telephone line is largely influenced by the transmission speed of Modem. If the phone line is not good, the line voltage is unstable, the 56K MODEM is less than 56K; and the extension is used online will also affect the Internet speed.
3. The correct driver is not installed.
4. Unlike the agreement used by ISP, only your MODEM is the same as your ISP protocol, Modem reaches 56K standards.
To eliminate the above reasons, your 56K Modem still is far below 53K, which is your MODEM hardware problem, you can consider replacement or send it.
Common faults 2: MODEM often dropped
There may be the following reasons for generating a drop-off problem:
1. The quality of the phone line is not good;
2. If the data terminal ready (DTR) signal is invalid, the line will cause a drop in the MODEM default setting.
3. If your phone has a "call waiting" program new function, whenever there is a phone call, the modem will be disconnected;
4. In addition, the quality of Modem itself and compatibility between different modems is also a general cause of the modem drop-down.
Common fault three: MODEM no dial tone
When online when you are quiet, in order not to make the dial tone to affect others sleep, you can change by appropriate AT commands: You can use the ATM0 to set the modem without dial tone, and the ATM1 sets the MODEM to have dial tones from dialing to the connection. For the selection of volume you can change, ATL0 (low volume), ATL1 (low volume), ATL3 (high volume).
Common faults four: fax speed is less than 14400
The maximum fax rate of Modem is 14400, while the speed of fax is only 9600. This is because the transmission and acceptance rate of most of the fax machines is 9600, and only the rate of use is 14400 or 33600 fax machine, the fax rate of Modem reaches 14400.
Common fault five: MODEM can't dial or connect
If you don't have your MODEM correctly, the communication function will not work properly. The following procedure lists the configurable driver files that verify the MODEM and Windows communication program, which may cause the COM port and modem to work abnormal, so you should first check if the correct Windows98 file is loaded.
1. Check existing newsletter
(1) Compare the comm.drv and serial.vxd files in the System directory compared to the original files in the Windows95 floppy disk or disc, check whether the size of the file is the same.
(2) Confirm that there is a few lines in the System.ini file: [boot] comm.drv = comm.drv [386ENH] device = * VCD
(3) Run the "Add New Hardware" wizard, detect and install the Windows 98 driver in Control Panel.
Note: Windows98 does not load the Serial.vxD driver in System.ini, but uses the registration command to load it. In addition, there is no file related to * VCD in System.ini. These files are built into VMM32.VXD.
2. Check the configuration of the modem
In the Control Panel, double-click the Modem icon. Verify your modem manufacturer and model, run the Install New Modem wizard to detect the modem and confirm that the current configuration is correct. If your modem does not appear in a list of installed modems, click Add, then select the appropriate modem. If the manufacturer and type are incorrect, and do not have your device manufacturer and type in the list, try the "GM" option in General Modem "option to set the maximum baud rate supported by the modem, and click "determine". Remove all modem entries in the exclusion of the collision list. 3. Check if the modem is in a state
Double-click the System icon in the Control Panel, and then click the Device Management tab, select your modem in the list and click Properties to confirm that "Device already exists, please use".
4. Check the correctness of the port
Double-click the "Modem" icon in Control Panel, select your modem, and then click Properties, on the Universal tab, check whether the listed port is correct. If not correct, select the correct port and click OK.
5. Confirm that the I / O address of the serial port and IRQ settings are correct
Double-click the System icon in Control Panel, click the Device Management tab, click Port, select a port, then click Properties, click the "Resource" tab to display the current resource of the port. Setup, see the manual of the modem to find the correct setting. In the Resource dialog box, check the Conflict Device List to see if the resource used by the modem is conflicting with other devices. If the modem conflicts with other devices, please order Click "Change Settings" and then click the configuration that does not generate a resource conflict.
Note: If there is a mouse or other device on COM1, do not use a modem on COM3. Usually the COM1 and COM3 ports use the same IRQ and cannot be used at the same time on most computers. COM2 and COM4 also have the same problem. If possible, change the IRQ settings of COM3 and COM4 ports to make them no longer conflict. In addition, there are some addresses of the display card and the COM4 port conflict. If conflicts, use other ports, or replace your graphic adapter.
6. Check port settings
Double-click the Modem icon on the Control Panel, click the Modem, and then click Properties, click the "Connection" tab in the menu that appears to check the current port settings, such as baud rate, data bit, stop bit And check.
7. Check the modem of the modem
Double-click "Modem" in Control Panel, select a modem, and then click Properties, click the General tab, and set the baud rate to the correct rate.
Note: If your call is unable to communicate under the original setting of the original setting, sometimes the baud rate may solve the problem.
