SunSolve Internal

Infodoc ID		Synopsis		Date
10180		Updated modem installation guide		16 Nov 1995

Description

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*** MODEM CONFIGURATION 4.x ***


If user follows these procedures, the Sun software and serial ports will be set
up correctly for modem use.  If user is having problems after all the steps are

complete, refer to the specific modemmanual to make sure modem 
configuration is correct, or call the modem vendor for assistance.

 1. Refer to the SunOS System and Network Administration manual starting page
    326.

 2. Make sure there is a modem cable; pins 2 through 8 and pin 20 arewired
    straight through.  Do not use a null-modem cable!
    Make sure connections are secure.

 3. Make sure the modem switch settings are correct and internal registers are
    set correctly by referring to Modem Manual. Hayes compatible modems using
    the AT command set, may work with Sun workstations and most are supported.

 4. Be sure that the modem is configured for the following:
    (READ the modem manual!)

    - Hardware DTR: that is, when the Sun drops DTR the modem should hang up.
- Hardware Carrier Detect: that is, the modem only raises the CD line when
      there is an active carrier signal on the phone connection. When carrier
      drops, either when the other end of the connection terminated or in 
      the event the phone connection is broken, the Sun will be notified and
      act appropriately.  The CD signal is also used for coordinating dial-in
      and dial-out use on a single serial port and modem.
    - Respond with numeric result codes.
    - Sends result codes.
    - Does not echo commands.

 5. Changing serial port communication parameters on the Sun workstation, 
    CD and DTR.  This applies to SparcSTATION 1 and also the following
machines:
    4/20, 4/25, 4/40, 4/50, 4/65, 4/70, and 4/75.

    The SPARCstation 1 and later models have an EEPROM that is significantly
    different from the others:

    Typing in the command 'eeprom' from a command prompt returns a listing of
    the various configuration parameters contained in NVRAM. The parameters
being
    dealt with here are listed below with their default settings.

         ttyb-rts-dtr-off=false
         ttyb-ignore-cd=true
         ttya-rts-dtr-off=false
         ttya-ignore-cd=true
 
    The eeprom command follows the format "eeprom <parameter>=<setting>".
    For example, to change the carrier-detect parameter for ttya to false,
    type the following:
 
         eeprom ttya-ignore-cd=false
 
    Below is a description of the settings that can be applied to the ports:
 
                **** These are the settings needed for modems ****

    ttya-ignore-cd=false    carrier-detect signal is not ignored by SunOS on
ttya
    ttya-rts-dtr-off=false  SunOS does assert DTR and RTS on ttya

 6. Make the dial-in and dial-out devices:
    NOTE:The dial out device minor number is 128 greater than the dialin tty

      for ttya                   for ttyb
      
      cd /dev                    cd /dev
      mknod cua0 c 12 128        mknod cua1 c 12 129
      chmod 600 cua0             chmod 600 cua1
      chown uucp cua0            chown uucp cua1 
 
 7. Be sure that the baud rate specified in the ttytab file corresponds to the
    /etc/gettytab file. 
    You can use a baud rate of 9600 or 19200 for a 14,400 bps modem.  
 
    Don't use the au to baud entries for old style modems.

    This assumes that the modem is set up on the ttya port.  Be sure to
    do the following:  (don't add the cua0 device to ttytab)
 
             The word "remote" must be in this line for a modem

    /etc/ttytab:
    console "/usr/etc/getty std.9600"       sun             on local secure
    ttya   "/usr/etc/getty std.9600"        dialup          on remote secure
 
    Be sure to execute this command after editing the ttytab file to restart 
    init:

     #        kill -1 1    (reread the ttytab file)
 
 8. Make sure that the serial port has software carrier detect disabled.  The
    modem will be checking for CD.  Edit the /etc/rc file and make sure that
    this line is not commented out.  If itis, please remove the # from the
    beginning of the line:

    /usr/etc/ttysoftcar -a  > /dev/null 2>&1
 
    save the file and run this command:
 
    #ttysoftcar -n ttya 
 
    NOTE: The above command will hang if the port is on. To turn the
   port off edit ttytab change on to off and do a kill -1 1
          
          Then type:          # ttysoftcar -n ttya
          
          Verify the setting: # ttysoftcar ttya
                              ttya is n

          Next turn the port back on and do a kill -1 1 again.
    
 9. Be sure that your /etc/remote file is correct.  Check to make sure that
    your dialers entry reads dv=/dev/cua0 or cua1 since this is the device we
    configured above.  Make sure also that the section where you tip hardwire
has the
    correct port assigned, in this example it would be dv=/dev/cua0  Also make
sure
    the tip0 line has the right BAUDRATE, whatever the modem is using.  Here's
    an example of the /etc/remote file:
 
    cua0:dv=/dev/cua0:br#9600:
    hardwire:dv=/dev/cua0:br#9600:el=^C^S^Q^U^D:ie=%$:oe=^D:
    tip1200: tc=UNIX-1200:
    tip0|tip2400:tc=UNIX-2400:
    UNIX-2400:el=^D^U^C^S^Q^O@:du:at=hayes:ie=#$%:oe=^D:br#2400:tc=dialers:
    UNIX-1200:el=^D^U^C^S^Q^O@:du:at=hayes:ie=#$%:oe=^D:br#1200:tc=dialers:
   
VMS-300|TOPS20-300:el=^Z^U^C^S^Q^O:du:at=ventel:ie=$@:oe=^Z:br#300:tc=dialers:
   
VMS-1200|TOPS20-1200:el=^Z^U^C^S^Q^O:du:at=ventel:ie=$@:oe=^Z:br#1200:tc=dialers:
    dialers:dv=/dev/cua0:
   
10. At this point if your modem is configured correctly you should be able to
    tip to the port and setup your modem register settings like this:
 
    tip hardwire  (baudrate and port from remote file)
    connected 
    AT&FE1V1X0&C1&D2S0=1&W  (for a Hayes compatable modem)
  ~.             (exit tip) 
    
    Refer to modem documentation or vendor for specific modem register
settings.
 
 

11. Now try to dial-out and dial-in to your newly configured system.
     
     tip hardwire        or  tip -9600 /dev/cua0
     connected           (modem responds) 
     atdt 9,5551212      (enter your phone number) 
     ~. (to disconnect)
     
     If you run into any problems please go through the following
troubleshooting
     section and if that doesn't help go through theinstructions again.
 
 
ERROR:
        can't syncronize with hayes

SOLUTION:
        check internal and external modem switch settings and cable
        connections.
        
        Power cycle the modem if necessary.


ERROR:
        can't synchronize with ventel

SOLUTION:
        If you  are using a Hayes compatible modem then change the /etc/remote
              file to at=hayes.

ERROR:
        tip:/dev/cua0: no such file or directory

SOLUTION:
         Make sure the /dev/cua0 exists and has permissions 600 owner uucp.

ERROR:
        tip:/dev/cua0: No such device or address

SOLUTION:
        You did not create the dialout device. (step 6) 
        or the device driver is missing from your kernel.

ERROR:
        all ports busy

SOLUTION:
        May mean someone is currently using the port either dial-in or
        dial-out.

        Check to make sure carrier detect was set properly (step 8) and 
        all modem settings.
          
        Sometimes power cycling the modem helps. Or unplug the serial cable 
        and plug it in again.

ERROR:
        tip: /dev/cua0: permission denied or link down

SOLUTION:
        Make sure you have dv=/dev/cua0 in the /etc/remote file.  Check also
        in /var/spool/locks for a lock file LCK.* and remove that.  Check
        permissions on /dev/cua0 and ownership.  /var/spool/locks directory
        must also have permissions of 777.