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 ppp.Devices(4)						      ppp.Devices(4)

      ppp.Devices - PPP physical device description file format

      The file /etc/ppp/Devices associates dialer types with physical
      devices and speeds. pppd examines it when placing a call to a
      neighboring machine.  If no suitable speed is found, or if all devices
      associated with that speed are busy, pppd will try again later.

      Entries are one to a line; blank lines are ignored.  Comments begin
      with a `#' and extend to the end of the line.  Upper/lower case
      distinctions are significant.  Fields on a line are separated by
      horizontal white space (blanks or tabs).

      Each entry must contain three or more fields, in this order:

      dialer	  Either the string `Direct', or the name of the modem
		  dialing chat script (found in Dialers) to use with this
		  device, or the name of an external dialer program.

      device	  The name of the device in the /dev directory (ttya, cua,
		  etc.).  Device names for SnapLink connections are followed
		  by a slash and the port number in use (rsd2a/0, rrz4a/2,

      speed	  The baud rate of the synchronous connection, or a string
		  to be matched against the speed field of entries in
		  Systems when the Systems device field is set to ACU.
		  Speeds must either be valid async baud-rate numbers (as
		  found in <&lt&lt&lt;sys/ttydev.h>&gt&gt&gt;) or must begin with them (2400,
		  38400, 19200-PEP, etc.), or must be speeds of which the
		  SnapLink hardware is capable (9600, 56000, 64000, 1536000,

      optional parameters
		  Any special handling for this device.	 Currently supported
		  values include:

		  xonxoff	    Specifies that the line be conditioned
				    for in-band (`software') flow control,
				    using the characters DC3 (^S, XOFF,
				    ASCII 0x13) to stop the flow and DC1
				    (^Q, XON, ASCII 0x11) to resume.  The
				    default is to use no flow control.	For
				    an outbound connection, this may be
				    specified either in Devices or on the
				    pppd command line.

		  internal-clocking The SnapLink will provide the
				    synchronous clock signal.  By default,

 Hewlett-Packard Company	    - 1 -   HP-UX Release 11i: November 2000

 ppp.Devices(4)						      ppp.Devices(4)

				    it expects the modem, CSU/DSU or modem
				    eliminator to provide the clock signal.
				    Internal-clocking cannot be used with
				    RS-232 cables on the SnapLink.

		  32-bit-fcs	    The SnapLink will calculate 32-bit FCS
				    values for transmitted frames, and check
				    received frames with 32-bit FCS
				    calculations.  This is not negotiable at
				    connection establishment time.  32-bit
				    FCS is only available when running
				    synchronous PPP on the SnapLink.

				    The number of additional HDLC flag
				    characters the SnapLink should insert
				    between data frames.  The default and
				    minimum is 2; the maximum is 16.

		  ignore-cd	    Ignore the state of the CD (Carrier
				    Detect, also called DCD, Data Carrier
				    Detect) signal.  This is useful for
				    systems that don't support CD but want
				    to run PPP over a dedicated line.

    External Dailer
      The external dialer program is run with the following arguments:

      device name	  The contents of the Device field from the Devices

      speed		  The contents of the Speed field of the Systems and
			  Devices entries.

      telephone number	  The contents of the Phone Number field of the
			  Systems entry.

      optional parameters Copied from the Optional Parameters section of the
			  Devices entry.

      If the external dialer program exits with status 0, then the dial
      attempt is considered to have succeeded.	Any other exit status
      indicates a failure.

	   #	   Devices - PPP devices file
	   #Dialer   device    speed	 Optional parameters
	   T2500-PEP cua  19200-PEP rtscts
	   T1600     cub  38400	    rtscts

 Hewlett-Packard Company	    - 2 -   HP-UX Release 11i: November 2000

 ppp.Devices(4)						      ppp.Devices(4)

	   Direct    rsd0a/0   1536000	 internal-clocking
	   Oddball   rsd0a/1   64000	 cua 9600 5551212

      In the last line of this example, the 64Kb synchronous modem on the
      SnapLink's port 1 has an asynchronous dialer interface attached to the
      workstation's port `a'.  The Systems line would look like

	   host Oddball rsd0a/1 64000 0

      There must be a program (or an executable shell script) called
      /etc/ppp/Oddball that dials the modem when invoked as

	   Oddball rsd0a/1 64000 0 cua 9600 5551212

      A warning message will be printed for each unrecognized optional
      parameter if the debug level is 2 or more.

      The external dialer is invoked as root, so you should take appropriate
      security precautions with its content and file protection.

      ppp.Devices was developed by the Progressive Systems.

      tun(4), ppp.Auth(4), ppp.Dialers(4), ppp.Filter(4), ppp.Keys(4),
      ppp.Systems(4), pppd(1), RFC 1548, RFC 1332, RFC 1144, RFC 1055.

 Hewlett-Packard Company	    - 3 -   HP-UX Release 11i: November 2000