Re: NIC as RS232
On Wed, 09 Jan 2008 09:29:41 +0100, Geert Uytterhoeven said: > We have plenty of DB9-to-RJ45 at work. Very useful when abusing the > Ethernet cabling in the wall for serial connections (also used for > phone). > > Maybe surprisingly to you, I haven't seen the RJ11 variant ;-) I have to admit, the RJ11 variant was from a long time ago, when Ethernet was still either Thickwire or Thinwire, and this Cat-N stuff was still in the future, so RJ45 wasn't exactly a common critter. For reference, the machine involved was an ATT 3B2-400, and some Blit terminals were in the mix, which tells you just how far back that was.. ;) pgpyVYVGmlUBL.pgp Description: PGP signature
Re: NIC as RS232
On Jan 9 2008 09:29, Geert Uytterhoeven wrote: >On Tue, 8 Jan 2008, [EMAIL PROTECTED] wrote: >> On Tue, 08 Jan 2008 08:48:35 +0200, Thanasis said: >> > Is there a kernel driver that would make a NIC's port work as a RS232 >> > port, using the serial cables that are RJ45 on one side and DB9 or DB25 >> > on the other? Maybe null modem cables of that type ? Or for example >> > those used by cisco as console port cables? >> > >> > (or may be I'm dreaming ;-) >> >> What I *have* seen are connectors that go from DB9/25 to RJ11, not RJ45. >> Basically, using the RJ11 to terminate a 4-conductor cable wired up for >> serial use. It's often hard to tell an 11 from a 45 unless you look at >> it *real* close > >We have plenty of DB9-to-RJ45 at work. Very useful when abusing the >Ethernet cabling in the wall for serial connections (also used for >phone). > >Maybe surprisingly to you, I haven't seen the RJ11 variant ;-) UPSes like APC Back-UPS CS 500 use RJ11/45. Connector has 8 contacts, but only 4 of them are fed to the to-USB integrated circuit. Funny. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: NIC as RS232
On Tue, 8 Jan 2008, [EMAIL PROTECTED] wrote: > On Tue, 08 Jan 2008 08:48:35 +0200, Thanasis said: > > Is there a kernel driver that would make a NIC's port work as a RS232 > > port, using the serial cables that are RJ45 on one side and DB9 or DB25 > > on the other? Maybe null modem cables of that type ? Or for example > > those used by cisco as console port cables? > > > > (or may be I'm dreaming ;-) > > What I *have* seen are connectors that go from DB9/25 to RJ11, not RJ45. > Basically, using the RJ11 to terminate a 4-conductor cable wired up for > serial use. It's often hard to tell an 11 from a 45 unless you look at > it *real* close We have plenty of DB9-to-RJ45 at work. Very useful when abusing the Ethernet cabling in the wall for serial connections (also used for phone). Maybe surprisingly to you, I haven't seen the RJ11 variant ;-) Gr{oetje,eeting}s, Geert -- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- [EMAIL PROTECTED] In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: NIC as RS232
On Tue, 08 Jan 2008 08:48:35 +0200, Thanasis said: > Is there a kernel driver that would make a NIC's port work as a RS232 > port, using the serial cables that are RJ45 on one side and DB9 or DB25 > on the other? Maybe null modem cables of that type ? Or for example > those used by cisco as console port cables? > > (or may be I'm dreaming ;-) What I *have* seen are connectors that go from DB9/25 to RJ11, not RJ45. Basically, using the RJ11 to terminate a 4-conductor cable wired up for serial use. It's often hard to tell an 11 from a 45 unless you look at it *real* close pgpYhS8X8NOTE.pgp Description: PGP signature
Re: NIC as RS232
On Tue, Jan 08, 2008 at 08:48:35AM +0200, Thanasis wrote: > Is there a kernel driver that would make a NIC's port work as a RS232 > port, using the serial cables that are RJ45 on one side and DB9 or DB25 > on the other? Maybe null modem cables of that type ? Or for example > those used by cisco as console port cables? > > (or may be I'm dreaming ;-) With a certain e.g. Freescale embedded communication processors that could be possible, as those have hardware that can do serial communication in many different bit patterns, and not being limited only on ethernets. However even they talk parallel MII protocol to Ethernet PHY, which then serializes the bitstream for transmit. Speeds are standard 10 and 100 Mbit/s, and electrical signals depend on wiring standard, probably isolated differential signals on twisted pairs. I don't think you can use any ethernet phy hardware for anything but ethernet frames. Even when you send bytes over MII, they are still just a bitstream needing MAC level processing to find correct alignments. You can, of course, talk ethernet protocol to remote serial port servers, but these days those systems talk TCP, which makes application programming all that much easier. Once upon a time I was talking to a group of telco engineers and said that "These Telco SDH ports are one of the reasons why bit communication is expensive. In the future things will go to optical ethernet interface, which is either carried over DWM lambdas for long hauls, or just dark fibers." Now it looks like I was right.. /Matti Aarnio -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
[Fwd: NIC as RS232]
Forget my previous question, as I understand now that I gave it a more serious though, that it is not a matter of driver, but an incompatibility between the two in the layer/media carrier level. I was dreaming :-) Original Message Subject:NIC as RS232 Date: Tue, 08 Jan 2008 08:48:35 +0200 From: Thanasis <[EMAIL PROTECTED]> To: linux-kernel@vger.kernel.org Is there a kernel driver that would make a NIC's port work as a RS232 port, using the serial cables that are RJ45 on one side and DB9 or DB25 on the other? Maybe null modem cables of that type ? Or for example those used by cisco as console port cables? (or may be I'm dreaming ;-) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: NIC as RS232
on 01/08/2008 08:48 AM Thanasis wrote the following: > Is there a kernel driver that would make a NIC's port work as a RS232 > port, using the serial cables that are RJ45 on one side and DB9 or DB25 > on the other? Maybe null modem cables of that type ? Or for example > those used by cisco as console port cables? > > (or may be I'm dreaming ;-) > > > > Forget my previous question, as I understand now that I gave it a more serious thought, that it is not a matter of driver, but an incompatibility between the two in the layer/media carrier level. (Yea, I was dreaming :-) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
NIC as RS232
Is there a kernel driver that would make a NIC's port work as a RS232 port, using the serial cables that are RJ45 on one side and DB9 or DB25 on the other? Maybe null modem cables of that type ? Or for example those used by cisco as console port cables? (or may be I'm dreaming ;-) <>