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We have installed VOIP in our office and have been told to change the TX Start speed to 9600pbs and the RX Start Speed to 9600 pbs - how do I do this

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Fax machines are ANALOG devices that will not work reliably on DIGITAL phone lines.

Posted on Dec 02, 2008

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FAX machines are ANALOG devices and will work best on analog lines, but with proper converter device (digital to analog and vice versa or IP to analog devices) will work with any line as long it is set right.

You must change the speed acording to your telephony service. Most commonly is 9600 (both RX and TX). and probably you have to turn off ECM.

How can you do that on L100 I don't realy know

Posted on Mar 19, 2013

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I HAVE B-472-QP TOSHIBHA THERMAL PRINTAR. BUT STILL NOT WORK. sOTWEAR and dreives is good and use cables 21 pin lpt cables in local. plz tel me detail wt happan our printer. any cable...


Take care the DB25 at the back of the printer is a serial port
2 =RX
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Speed 9600,
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Un less you have a centronics connector but it is optional

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My fax cannot receive e faxes sent by a computer. Standard faxes from a fax machine receive fine.


Hi; its a problem of speed Tx and Rx config your coputer speed at the same speed of the fax. the fax use the mode ECM for Tx and Rx

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How do I change the Baud rate on a canon f80 fax


To set the receive speed
Change RX Start Speed Setting The message [START AGAIN] will appear if phone line conditions are less than perfect. Decrease the transmission (RX or send) speed if this message appears frequently on the LCD.
  1. On the operator panel, press <Menu>.

  2. Press the left '<' or right '>' arrow repeatedly until [USER DATA] appears.

  3. Press [Set].

  4. Press the right arrow repeatedly until [FAX SETTINGS] appears.

  5. Press [Set].

  6. Press the right arrow repeatedly until [RX SETTINGS] appears.

  7. Press [Set].

  8. Press the right arrow repeatedly until [RX START SPEED] appears.

  9. Press [Set].

    1. The factory default RX (send) Speed is 33600 bps.
    2. You can select from the following RX Speeds:
      14400 bps
      9600 bps
      7200 bps
      4800 bps
      2400 bps

  10. Press the right arrow to display the applicable RX Speed.

  11. Press <Set>.

  12. Press <Stop> to return to standby mode.
To Set the Send Speed

Change TX Start Speed Setting The message [START AGAIN] will appear if phone line conditions are less than perfect. Decrease the transmission (TX or send) speed if this message appears frequently on the LCD.
  1. On the operator panel, press <Menu>.

  2. Press the left '<' or right '>' arrow repeatedly until [USER DATA] appears.

  3. Press [Set].

  4. Press the right arrow repeatedly until [FAX SETTINGS] appears.

  5. Press [Set].

  6. Press the right arrow repeatedly until [TX SETTINGS] appears.

  7. Press [Set].

  8. Press the right arrow repeatedly until [TX START SPEED] appears.

  9. Press [Set].

    1. The factory default TX (send) Speed is 33600 bps.
    2. You can select from the following TX Speeds:
      14400 bps
      9600 bps
      7200 bps
      4800 bps
      2400 bps

  10. Press the right arrow to display the applicable TX Speed.
You can download a copy of the user manual for the F80 at
http://www.usa.canon.com/consumer/controller?act=ModelInfoAct&tabact=DownloadDetailTabAct&fcategoryid=334&modelid=7175

Please make sure to rate this solution. Thanks.
  1. Press <Set>.

  2. Press <Stop> to return to standby mode.

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Fax error message = TX cancelled:RX fax info mismatch???? Cannot send fax - How do I fix this error - Not all faxes return this message


Two Issues:

1. The Transmission Speed of the MX860 may be too fast.
Solution: on FAX Menu go to Settings>Device Settings>FAX Settings>Transmission Settings >"TX start speed" and change to 14400 or lower (14400 worked for me).

2. The recipient FAX machine may be receiving by a different number than the one you dial. This may occur if you dial a free-calling no.
Solution: Go to Transmission Settings as above>"Check RX fax info" and turn it to OFF. This disables the mismatch issue.

Hope this helps. aknz

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1 Answer

Sending fax


Iam afraid HP Supports VOIP Services, they always says that we do not assure fax in VOIP Service because it is not analog it is digital they always refer to your service provider
Also you can tried reducing the speed of the fax machine
That is> Press Menu/Setup> then scroll toAdvance Fax setup> Then Fax Speed> then Press Ok> And reduce the speed to Slow and then try.

Good Luck

Jun 13, 2008 | HP PSC 2210 All-In-One InkJet Printer

1 Answer

Baud rate


1. Why 9600?

Because you are using a VOIP service it can from time to time lose connection briefly. The slower the speed the less data can be loss do to network congestion. It also gives the error correcting function of the receiving fax a better chance of filling in any lost data.
9600 is a good choice becasue the industry minimum is 9600. This means you will be able to communicate pretty much any fax thats is still tickin today. Raising the speed will get you a faster transfer but will also increase the chance that you are sending data at a faster rate than the recieving fax can send.

2. How to change the baud rate....

Press Menu/Set, 2, 0, 1.
Press ▲ or ▼ to select Basic or
Normal (or High*).
Press Menu/Set.
Press Stop/Exit.
* High is available for FAX-2910, FAX-2920
and MFC-7225 only.
Note
Basic reduces the modem speed to 9600
bps. Unless interference is a recurring
problem on your phone line, you may
prefer to use it only when needed.
Normal sets the modem speed at
14400 bps.
High sets the modem speed at
33600 bps.

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1 Answer

Just bought and install fax machine (MFC640cw) I can send faxes but cannot recieve any. Phone rings, it recieves but it does not print.


It was installed on a VOIP connection. The Modem speed was changed to BASIC (9600 bps) which turns the error correction mode (ECM) off. Standard speed -14400 bps which may creat errors.
Steps: Menu/set - Fax - Miscellaneous - Compatibility - BASIC - Menu/set - Stop/Exit

May 21, 2008 | Brother Office Equipment & Supplies

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