sun serial consoles via usb and linux

James Knott james.knott-bJEeYj9oJeDQT0dZR+AlfA at
Thu Dec 4 22:10:17 UTC 2008

Neil Watson wrote:
> On Thu, Dec 04, 2008 at 04:56:59PM -0500, James Knott wrote:
>> A crossover "null modem" cable is generally required for computer -
>> computer communications.  They're standard, buy them at almost any place
>> that sells pre-made cables.
If it uses an RJ-45 connector (CAT5 refers to a cable quality standard,
not a connector type), it's often the "Cisco" connection.  Those can be
found, though not it your typical corner computer store.  You can get
adapters that connect such a cable to the DE-9 serial port connectors,
but you generally have to wire them yourself.
> What about the end connectors if one uses a cat5 cable.  How can the
> correct ends be identified?

Look at the wires in the plug.  If they're the same colours at both
ends, they're a straight through cable, which can be used.  If there are
differences, it's likely an ethernet crossover cable.  Please note,
those 8 pin RJ-45 connectors get used for a lot of different things,
besides ethernet or serial ports.

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