ITEM: AL0627L

7318 P10 style port and 28.8 modem with baudrate 115200

ENV:
     7318 model s20, P10 style port
     USRobotics 28.8Kbps modem  

DESC:
        Since the 28.8Kbps modem is capable of data compression
        and "effective throughputs" of up to 115200 bps, I would
        like to setup the modem at a higher buad rate than the
        AIX limit of 38400.  How is this possible on the 7318 as
        I understand it supports devices at this high speed?

ACT:

        Smitty -> Devices -> Communications -> CNS ->
                CNS Port Options Configuration -> hibaud config.

  Configures a port to use extended baud rates.  Unix only               x+
  directly supports a maximum rate of 38400 bps; however, with the       x+
  hibaud option set, the unix stty reported rate of 2400 baud is         x+
  mapped to 57600, 4800 bps is mapped to 76800, and 19200 is mapped      x+
  to 115200 baud.  A value of 'no' indicates that hibaud is not set;     x+
  'yes' indicates that hibaud is turned on; and 'not configured'         x+
  indicates that the port has no devices configured on it.  A TTY        x+
  or Printer must be configured before buddy can be enabled on a port.   x

        Once you made the above change to "yes" for hibaud, you 
        can do a cu -s19200 -ml tty\# and 19200 will actually mean
        115200.

        To /etc/uucp/Devices add:
                Direct tty\# - 19200 direct

        pdisable tty\#
        cu -s19200 -ml tty\#    (where 19200 actually means 115200)

        Send the US Robotics modem this setup string:
                AT&F&B1&C1&D2&H1&I0&R2&K3&N0Q2S0=1&W

        Disconnect from cu
                ~.

        Now, penable (or pshare or pdelay) your tty\# again.



Support Line: 7318 P10 style port and 28.8 modem with baudrate 115200 ITEM: AL0627L

Dated: July 1995 Category: N/A

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