SUMMARY: Connecting a 56k leased line to a Sun [using HSI board]

From: Mark Epstein (
Date: Fri Apr 01 1994 - 14:56:57 CST


I waited a while for responses, but only got a few. Aparrently there
are not many managers out there using the Sun HSI boards. The
information I did receive said that the boards work fine, but that you
need a copy of Sun PPP to run them.

Many thinks to the respondents. They were:
    Christian Lawrence <> (John Justin Hough) (Glenn Satchell - Uniq Professional Services)
    hal@yin.UCSD.EDU (Hal Skelly)

Looking at the SunExpress catalog, it looks like when you buy an HSI
board, it comes with a CD-ROM. Contents of that CD-ROM are currently
unknown to me. The CD may contain a driver that is necessary to run
the boards. According to Glenn Satchell, one of the responding
sun-managers, SunLink PPP 1.0 has the necessary synchronous drivers.

I am going to get SunLink PPP 1.0 as recommended and try it out.

Unfortunately, I have not been able to test the suggestions presented
yet. When I have a working configuration, I will send a second

-(Thanks) MarkE

-------- Responses --------
    Date: Mon, 21 Mar 1994 08:44:35 -0500
    From: Christian Lawrence <>

    HSI has rs449 ports so you'll need a signal convertor to plug
    your V.35 connection into the HSI. Black Box and others sell them.

My VME HSI board has two ports marked RS-449 and two ports marked
V.35. I think that Christian must be thinking of a different board
than mine--possibly the SBus variant, as I know nothing about that.

    Date: Mon, 21 Mar 1994 10:10:55 +0600
    From: (John Justin Hough)


      You need INR or PPP from Sun since you have a their HSI product.

      I have some Sun's as routers using HSI and INR; it works.


    Date: Sun, 20 Mar 1994 19:04:56 --1000
    From: (Glenn Satchell - Uniq Professional Services)

    Buy Sunlink PPP-1.0 from Sun, it includes the synchronous drivers
    for the HSI board. The drivers included with the OS only provide
    an asynchrounous driver. Once PPP is installed routing, etc, will
    work fine using the standard in.routed supplied with SunOS.

This is what I am going to try.

    also your hardware is interesting, a 4/350, if it's not a typo
    then it must be a 4/300 cpu in one of the old 6 slot vme cages.

That is exactly the hardware configuration I have.

    Glenn Satchell
    Uniq Professional Services Pty Ltd ACN 056 279 335
    PO Box 70, Paddington, NSW 2021, (Sydney) Australia
    Phone 02 360 7434 Pager 016 287 000 Fax 02 331 2572
           "Sun Accredited System Consultants"

    Date: Mon, 28 Mar 1994 10:12:14 +0800
    From: hal@yin.UCSD.EDU (Hal Skelly)


    I was hoping that a summary would come across the Sun Managers
    list of what replies you received. Since I haven't seen one yet,
    did you get any further info on the 56k line? We have an IPX
    running as a WAN hub and many of the pieces of hardware you
    describe (except we will be using a switched 56 line instead of
    dedicated). I've already asked Morningstar about their PPP
    product which unfortunately, doesn't support our setup. Any help
    you care to provide would be appreciated.

Sorry about the lateness of this summary. The managers were helpful,
and I was (as usual) very busy.


               Hal Skelly, System Administrator for IGPP/IDA
      Scripps Institution of Oceanography, Univ. of Calif. San Diego
            Internet:, voice (619) 534-3759

-------- Original Question --------
Subject: Connecting a 56k leased line to a Sun
Date: Fri, 18 Mar 1994 02:42:13 PST
From: Mark Epstein <>


I have a pile of parts and a problem:

** The parts **

    1. A Sun 4/350 running SunOS 4.1.3.
    2. A Sun VME HSI (high-speed serial interface) board.
       This board has two RS-449 and two DB25 V.35 connectors on it.
    3. A 56k leased line, connected on my end to...
    4. A CSU/DSU with a V.35 telecom-style output.

** The problem **

    I want to use my Sun as a router between the 56k leased line
    (running PPP or SLIP or something) and my local net, using the HSI
    board's V.35 port?

I tend away from using the RS232 interface on the CSU/DSU to my system
board's serial port, because the interrupt rate would drag system
performance down into the muck.

Thanks is advance for your help!


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