Книга: Linux Network Administrator Guide, Second Edition

A Serial NULL Modem Cable

A Serial NULL Modem Cable

A serial null modem cable will work for both SLIP and PPP. Again, you will need two DB-25 connectors. This time your cable requires only eight conductors.

You may have seen other NULL modem cable designs, but this one allows you to use hardware flow control - which is far superior to XON/XOFF flow control - or none at all. The conductor configuration is shown in Figure B.2:

Again, if you have a shield, you should connect it to the first pin at one end only.

Figure B.1: Parallel PLIP cable


Figure B.2: Serial NULL-Modem cable


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