[1100] in linux-net channel archive
Re: LAP Link serial cable for PPP?
daemon@ATHENA.MIT.EDU (Louis Frayser)
Thu Sep 14 18:56:15 1995
Date: Wed, 13 Sep 1995 21:12:10 -0700 (PDT)
From: Louis Frayser <frayser@earthlink.net>
To: dkim@infi.net
Cc: linux-ppp@vger.rutgers.edu, linux-net@vger.rutgers.edu
In-Reply-To: <9509131741.AA1298@TS8DDKK.bestprod.com>
On Wed, 13 Sep 1995 dkim@ts8ddkk.bestprod.com wrote:
> Has anyone used LAP link serial cable for Linux PPP
> connection to another Linux?
>
> Any info on which "over the counter" cable works best for
> the PPP connection would be appreciated.
>
>
I have never used pppd without a modem, but I don't see why a null modem
cable wouldn't work.
You didn't say if you were having problems, or if you were just looking
for information in advance. There is a Serial-HOTTO file, probably in
/usr/doc that should explain how to make the cable.
You may also wan't to consider a parallel connection. There's PLIP
which is probably faster. I've never used PLIP so I can't say how easy it
is to set up.
--
Here is part of the Serial doc:
8.1 Hardware requirements
Make sure you have the right kind of cable. A null modem cable bought at a computer store will do it. But it must
be a null modem cable! Make sure you are using your serial port, the male DB25 or the DB9, and not your parallel
port.
At a minimum, you should have (for a DB25 connector):
TxD Transmit Data 2 - 3 RxD Receive Data
RxD Receive Data 3 - 2 TxD Transmit Data
SG Signal Ground 7 - 7 SGD Signal Ground
If you want to have hardware handshaking signals, you must have a full null modem cable:
FG Frame Ground 1 - 1 FG Frame Ground
TxD Transmit Data 2 - 3 RxD Receive Data
RxD Receive Data 3 - 2 TxD Transmit Data
RTS Request To Send 4 - 5 CTS Clear To Send
CTS Clear To Send 5 - 4 RTS Request To Send
DSR Data Set Ready 6 - 20 DTR Data Terminal Ready
SG Signal Ground 7 - 7 SG Signal Ground
DCD Carrier Detect 8 - 20 DTR Data Terminal Ready
DTR Data Terminal Ready 20 - 6 DSR Data Set Ready
DTR Data Terminal Ready 20 - 8 DCD Carrier Detect
If you have a DB9 connector on your serial port, try the following:
DB9 DB25
RxD Receive Data 2 - 2 TxD Transmit Data
TxD Transmit Data 3 - 3 RxD Receive Data
SG Signal Ground 5 - 7 SG Signal Ground
Alternatively, a full DB9-DB25 null modem cable:
DB9 DB25
DCD Carrier Detect 1 - 20 DTR Data Terminal Ready
RxD Receive Data 2 - 2 TxD Transmit Data
TxD Transmit Data 3 - 3 RxD Receive Data
DTR Data Terminal Ready 4 - 6 DSR Data Set Ready
DTR Data Terminal Ready 4 - 8 DCD Carrier Detect
SG Signal Ground 5 - 7 SG Signal Ground
DSR Data Set Ready 6 - 20 DTR Data Terminal Ready
RTS Request To Send 7 - 5 CTS Clear To Send
CTS Clear To Send 8 - 4 RTS Request To Send
(RI Ring Indicator 9 - 22 RI Ring Indicator)
If you are not using a full null modem cable, you might have to do the following trick: on each side of the
connector, connect RTS and CTS together, and also connect DSR, DCD and DTR together. This way, when the
computer or terminal wants a certain handshaking signal, it will get it (from itself).
Now that you have the right kind of cable, connect your terminal to your computer. If you can, tell you terminal to
ignore modem control signals. Try using 9600 bps, 8 data bits, 1 stop bit, no parity bits for the terminal's setup.
-Louis
>
> Daniel K. Kim
> Sr Systems Programmer
> Best Products Company, Inc.
> 1400 Best Plaza
> Richmond Virginia 23227
> 804/261-6185 (Voice)
> 804/261-2932 (Fax)
>
>
>
>
+--------------------------------+-------------------------------------+
| mailto:frayser@earthlink.net | http://www.earthlink.net/~frayser |
| frayser@aol.com | |
+--------------------------------+-------------------------------------+
On Wed, 13 Sep 1995 dkim@ts8ddkk.bestprod.com wrote:
> Has anyone used LAP link serial cable for Linux PPP
> connection to another Linux?
>
> Any info on which "over the counter" cable works best for
> the PPP connection would be appreciated.
>
>
>
> Daniel K. Kim
> Sr Systems Programmer
> Best Products Company, Inc.
> 1400 Best Plaza
> Richmond Virginia 23227
> 804/261-6185 (Voice)
> 804/261-2932 (Fax)
>
>
>
>
+--------------------------------+-------------------------------------+
| mailto:frayser@earthlink.net | http://www.earthlink.net/~frayser |
| frayser@aol.com | |
+--------------------------------+-------------------------------------+
