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Modem Configuration

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Modem Configuration

Is there a way to turn off V.42 bis Data compression for our modems? it causing some problems for dialing into our server.

Thanks in advance,


Honored Contributor

Re: Modem Configuration

And the make and model of your modem is?

Re: Modem Configuration

Our modem is a US Robotics Courier 36.6/28.8

We know the ATDT command to disable compression but we are having trouble connecting to the modem.

Honored Contributor

Re: Modem Configuration

Hi there.
Try this URL :


You will find some documents for modem setup including USR .
If you cannot acces this page let me know.
Alexander M. Ermes
.. and all these memories are going to vanish like tears in the rain! final words from Rutger Hauer in "Blade Runner"
Honored Contributor

Re: Modem Configuration

I can't get it. Could you please post the data?

Honored Contributor

Re: Modem Configuration

Hi there. Here the first one :

Problem Description

How to configure US Robotics V.Everything Modems on HP-UX systems.


1) Setup the modem using SAM or commands per the manual "Additionally
Configuring HP-UX for Peripherials", specifically the section
"Additionally configuring HP-UX for modems". This manual is on HP 10.X

2) Direct connect to the modem via the cu command or kermit and issue
the modem program string provided below.

**NOTE** These register settings have *NOT* been tested by the Hewlett
Packard Response Center and are *NOT* gauranteed to work.
For specific modem support, please contact the modem

It is recommended that the customer first set the modem up as
a 19,200 baud or slower speed to establish functionality.

1. DIP SWITCH SETTINGS: start with dip switches 3, 5, 8, 10 DOWN/ON, the
rest leave UP/OFF and power modem off and on again.
This will set modem to factory defaults.

2. The modem commands can be entered as one string;

3. If modem is to be used for dialin only, move dip switch 4 down (on) and all
other switches to up (off). Next, power the modem off and on. If the
TR LED isn't lit on the front panel, then move dip switches 1 and 4 down (on)
and all other switches down (off). Finally, power the modem off and then on.

If modem is to be used for dialin and dialout, move dip switches to:
3, 4, 7, 8 down (on) and all other dip switches are up (off). Next, power
the modem off and on. If the TR LED isn't lit on the front panel, put dip
switch 1 down (on) and power the modem off and on.

When dialing out, the modem does not echo commands to the screen; but, it
will receive the commands and dial out as instructed. If the modem has
a different baud rate saved in NVRAM than the computer serial port, you
will run into trouble with garbage characters. To correct this, you
will have to correct the baud rate and data bit construction in your
communications software and perform steps 1 thru 3 again.

*NOTE: Settings that enable flow control, and data compression can be
changed after successful operation of the modem is established. At the
outset, it is advisable to disable data compression and flow control.
For further information on Modem configuration, please consult your
owner's manual or the modem manufacturer.

Flow Control initialization string:


NOTE: Software flow control should *NOT* be used if you use or
contemplate using UUCP as it will interfere with UUCP operation.
Hardware flow control is supported only on certain HP-UX interfaces and
requires a special device file setup.

RM / Apr 1998

Alexander M. Ermes
.. and all these memories are going to vanish like tears in the rain! final words from Rutger Hauer in "Blade Runner"
Honored Contributor

Re: Modem Configuration

Hi there.
Next pls :

Configuring non-HP modems.

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Score : 0
Document Type : EN
Date : 1994 Apr 13
Description : Configuring non-HP modems.
Document Id : PU94040614442
Search String :

You may provide feedback on this document

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Problem Description

Configuring non-HP modems.

I am attempting to configure a modem on my HP 9000 machine but I am
having difficulty determining which modem settings I should be using.
What does the HP 9000 expect from a modem?


The following list outlines the requirements for unsupported modems on
HPUX. Refer to your modem documentation or call the modem manufacturer
with this information and they should be able to provide you with the
proper switch positions or commands to configure your modem.

We also suggest that you refer to the modem section in the HP manual
"Remote Access: User's Guide" particularly page 4-16.

* The modem should NOT ignore DTR.

* The modem should autoanswer when the HP computer raises DTR.

* The modem should hang up the line, disable autoanswer and return to
command state when the computer drops DTR. This is AT&D2 on Hayes modem.

* We do not recommend that the modem does a power on reset when DTR is
dropped as some modems temporarily raise CD during reset. In Hayes
modems this would be AT&D3 - not recommended.

* The modem should assert carrier detect only when there is a carrier
and should drop CD when the carrier is lost. This is AT&C1 on a Hayes modem.

* Hardware flow control (RTS/CTS) should be OFF.

* The modem should pass through BREAK.

* The modem speed should float, that is the modem should talk to a DTE
at the same speed as the modem connects to other end. Turn OFF XON/XOFF
flow control in the modem.

If there are no plans to use UUCP, the modem can be set to use
fixed DTE speed and XON/XOFF flow control. If the HP port
supports CTS/RTS, use fixed speed with no flow control to get
communications working. When satisfied that a user can connect to
the port repeatedly and from multiple modems, then turn on RTS on
both the computer and the modem. Then if there are problems, they
can be isolated to RTS/CTS.

* If modems connect but no data appears, turn off all compression,
reliability, MNP, PEP, LAP or other advanced features and set the modem to
be as dumb as possible. Get it working, then turn on advanced features.

* Do NOT use CCITT control signals on the modem or on the HP computer.
This does not affect the ability of modem to use CCITT features such as
V.22 and V.32.

* Remember to save the modem settings in non-volatile memory on the
modem so it retains the setup after power loss. This is AT&W on Hayes
modems. Write down the settings somewhere so you will remember them if
the modem loses its settings or they are changed.

Alexander M. Ermes
.. and all these memories are going to vanish like tears in the rain! final words from Rutger Hauer in "Blade Runner"