Chinese
     
FAQ : FAX / MODEM CARD Drive
A. BTC Modem Model  
B. Installation information  
C. System requirement  
D. Initialization string  
E. V.80 / V.90  
F. V.90 upgrade  
G. Connectivity
 
 
G. Connectivity  
G-1. Why can't I connect at speed 56K using a 56k capable modem?  
G-2. Why is my modem got disconnected all the time?  
G-3. Does BitWare support B-plus protocol?  
G-4. Should I re-install BitWare when modem changed?  
G-5. Why my BTC modem can't receive FAX?  
G-6. Why my BTC modem connect to other modem at 33.6K?  
G-7. Why my BTC modem is not listed in the software I am using?  

 
G-1. Why can't I connect at speed 56K using a 56k capable modem?
Due to FCC limitations, speeds of 53kbps are the maximum permissible transmitting power levels during download transmission. Actual data speeds will vary depending on line condition.
  1. Telephone Line quality
    V.90 requires higher line quality than other protocol. The SNR (Signal Noise Ration) should be higher than 40%. To check out SNR, do the following: Use AT command `ATDT XXX` in `Hyper Terminal` to dial out to an ISP (XXX is your ISP phone number). After successful connection, type `AT%Q` in the `Hyper Terminal` and the SNR will be returned on the screen.
  2. PABX: Private Automatic Branch Exchanges
    All 56K standards require that the data path from your local telephone company to your ISP must be entirely in the digital domain and that the only analog section be from your modem, to the local Telephone Company. If there is more than one analog-digital conversion in the path from your home to your ISP, then 56K speeds are impossible. If you dial out through your PABX, the connection speed will be limited below 33.6K bps. Because there is one more analog-digital conversion in your line, there will be no 56K speed between two 56K modems connected directly by a telephone line because there is no digital transfer mode in this line.
  3. ISP: Internet Service Provider
    A few of the providers do have connectivity incompatibility problem. We can only connect to these ISP at 33.6 K speed or lower. These providers have confirmed their incompatibility problem. Check out from your ISP about the vender their equipment and e-mail us if you can not get 56K speed after checking all the other steps.
  4. Incorrect DTE setting
    Make sure to set the DTE (Data Terminal Equipment) baud rate at 115200 bps or higher.
  5. CPU overload
    You can use "System Monitor" in [Programs Files]->[Accessories]->[System Tools] to check out the CPU utilization. Use the `Hyper Terminal` to dial out to an ISP. The CPU utilization for this should not exceed 50% otherwise it is possible that the modem will become starved for data while waiting for some CPU time. That is why your PC must meet a minimum set of system requirement. If not, it is possible that the modem will run at low speed or get disconnect all the time when CPU intensive applications are loading or running. To better this situation off, you should upgrade the computer to meet the minimum system requirements as described above. Below is the CPU utilization for BTC V.90 modems:
  56IP
 
Pentium II 350
10% ~ 15%
Pentium II 233 20% ~ 25%
AMD K6-2 300 25% ~ 30%
Pentium MMX200 35% ~ 40%
Pentium MMX 166 40% ~ 45%
  56IPI
 
Pentium II 350
8% ~ 12%
Pentium II 233 15% ~ 20%
AMD K6-2 300 20% ~ 25%
Pentium MMX200 30% ~ 35%
Pentium MMX 166 35% ~ 40%
  Do not run too many programs simultaneously, or the CPU resource will not be sufficient for you modem to operate properly.
 
G-2 Why is my modem got disconnected all the time?
1. CPU Overloading
    Refer to Why can't I connect at speed 56K using a 56k capable modem?
  2. Line Quality
    refer to Why can't I connect at speed 56K using a 56k capable modem?
  3. Driver
    56IP Driver ver 7.45 are incompatible with some operating systems. It will drop the line in a few minutes after connection.
  4. Call Waiting Service
    Call waiting is a service when the user is on the phone and another call is coming in, which the phone line will be sent a momentary beep to notify the presence of a new incoming call. This momentary beep will interrupt the normal data transfer of the modems and may cause disconnection. To prevent this, users should disable the call waiting tone function if they wish to use the modem. Many applications allow users to specify the special code that should be dialed to disable the feature for that phone session. (In some USA telephone networks, the code is *70. Contact your telephone company to check out the code that your network uses).
 
G-3 Does BitWare support B-plus protocol?
B-plus is a File Transfer protocol.
 
G-4 Should I re-install BitWare when modem changed?
1. Yes, you must re-install BitWare when modem changed.
  2. If you install another modem ( different modem model ) on your PC, you have to un-install BitWare and then re-install Bitware to work properly, otherwise, the receive-FAX function may not work.
 
G-5 Why my BTC modem can't receive FAX?
1. In general case, that's because you changed your modem.
  2. If you install another modem ( different modem model ) on your PC, you have to un-install BitWare and then re-install Bitware to work properly, otherwise, the receive-FAX function may not work.
 
G-6 Why my BTC modem connect to other modem at 33.6K?
56K is an asymmetrical connection.
This means that it works at 56K when downloading data and at 33.6K when uploading data. Any connection between 2 56K modems can only communicate at maximum speed 33.6K.
 
G-7 Why my BTC modem is not listed in the software I am using?
Some models of BTC modems are too new to be listed in some software. If you can't find out the modem model in the list, then
  1. if you are using 56IP/56IPI/56IPK/1898 modem, choose PCtel compatible modem first.
  2. otherwise choose Hayes compatible modem.

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