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Date:      Tue, 22 Dec 1998 12:49:42 +1030
From:      Greg Lehey <grog@lemis.com>
To:        "Igor B. Bykhalo" <goshik@binep.ac.ru>, FreeBSD-questions <freebsd-questions@FreeBSD.ORG>
Subject:   Re: your mail
Message-ID:  <19981222124942.U85005@freebie.lemis.com>
In-Reply-To: <MAPI.Id.0016.006f7368696b20203030303630303036@MAPI.to.RFC822>; from Igor B. Bykhalo on Mon, Dec 21, 1998 at 06:44:53PM -0800
References:  <MAPI.Id.0016.006f7368696b20203030303630303036@MAPI.to.RFC822>

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On Monday, 21 December 1998 at 18:44:53 -0800, Igor B. Bykhalo wrote:
> Good time of day everybody,
>
> I have a question on null-modem connection.
> We are using SLIP over the leased line to
> connect to our ISP. Modems we are using
> have neither hardware flow control nor internal
> buffers, and modems manufacturer confirmed
> me that our line can be considered just as
> the null-modem cable looking like:
>
>   We      ISP
>  RxD ---- TxD
>  TxD ---- RxD
>  DTR ---- DCD
>  DCD ---- DTR
>  SG  ---- SG
>
> I found this layout different from the one
> mentioned in Handbook(handbook187.html):
>
>    TxD   2  -----------------------  3    RxD
>    RxD   3  -----------------------  2    TxD
>    DTR  20  -----------------------  6    DSR
>    DSR   6  -----------------------  20   DTR
>    SG    7  -----------------------  7    SG
>    DCD   8  ----------------------+  4    RTS*
>   *RTS   4  +                     +  5    CTS*
>   *CTS   5  +----------------------  8    DCD

There are hundreds of variants in this kind of cabling.

> (How) must this be accounted for to ensure the proper line
> functioning?

You don't want crossover, since the modems do that for you.  Just 1:1
wiring would be the best thing to try first.

I know that SLIP is still in wide use in Russia, but I don't
understand why.  Can't you use PPP in this situation?  The software is
much better maintained.

Greg
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