Need help on connecting V34 modem with HP9000/370 under HP-Ux 9.03

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2 total messages Started by Lieven Tomme Wed, 23 Aug 1995 06:16

Author: Lieven Tomme
Date: Wed, 23 Aug 1995 06:16

21 lines
1135 bytes

Hello,

I currently have a V34 modem connected over a 19200 bps
serial line with a HP 9000/370 machine that is running
HP-Ux 9.03. The machine has BTW several 98642 multiplexer
cards as well.

This means that, knowing that the V34 modem can exchange
data at a rate up to 115200 bps, the serial line towards
the HP itself is the bottleneck in having a high throughput.

Do you happen to know if I can make the HP 9000/370 port or
a 98642 serial port work at rates higher than 19200 bps,
under HP-Ux 9.03, and if so, how ???

When replying to the newsgroup, I would appreciate a copy
to myself as well.

Thank you most kindly :-)

Lieven

Re: Need help on connecting V34 modem with HP9000/370 under HP-Ux 9.03

Author: Michael Katzmann
Date: Thu, 24 Aug 1995 00:22

46 lines
2643 bytes

In article <41eh4q$a87@ping1.ping.be>,
	Lieven Tomme <Lieven.Tomme@ping.be> writes:

>I currently have a V34 modem connected over a 19200 bps
>serial line with a HP 9000/370 machine that is running
>HP-Ux 9.03. The machine has BTW several 98642 multiplexer
>cards as well.
>
>This means that, knowing that the V34 modem can exchange
>data at a rate up to 115200 bps, the serial line towards
>the HP itself is the bottleneck in having a high throughput.
>
>Do you happen to know if I can make the HP 9000/370 port or
>a 98642 serial port work at rates higher than 19200 bps,
>under HP-Ux 9.03, and if so, how ???
>

I don't think this can be done from the 370.  I use a 380 and I can get 38K4Bd
using the FIFO.
To quote from the "termio" man page:

      Data loss can occur with HP 98626/98644 serial interfaces and the
      built-in serial interface of the Model 318, 319, 320, 330, 332, R/332,
      340, 350, 360, V/360, and 370 if the effective combined data rate for
      all installed serial interfaces exceeds 2400 baud (for example, two
      interfaces running at 1200 baud and a third at 300 baud is equivalent
      to 2700 baud combined).

      HP 98626/98644 serial interfaces and the built-in Series 300 serial
      interfaces of the Models listed above do not support 38400 baud.

      HP 98642/98638 serial interfaces do not support 200 and 38400 baud.
      The second and third (select code 5,6) serial interfaces of Series 400
      machines support no bit rates above 19200.  On the Model 425e, this
      also applies to the first (sc 9) port.

      Built-in serial ports on the Series 400 machines (except Model 425e)
      support the following additional baud rate settings: 57600, 115200,
      230400, and 460800 baud.  An RS-232-to-RS-422 converter may be
      required to achieve practical cable lengths at these baud rates
      (because RS-232 only specifies up to 19200 baud).


-- 
   |\      _,,,---,,_          Michael Katzmann  ( NV3Z / VK2BEA / G4NYV )
   /,`.-'`'    -.  ;-;;,_               -  Annapolis.  MD

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