The main problem in high-bandwidth fibreoptic communication are NOT losses in the fibre (and has not been since the late 70's). The overhauling problem is dispersion. A pulse subject to dispersion will, when travelling in a fibre, flatten out and become much wider. In optical communication you send data in time bins. To send the digital sequence 10110 you would in the first bin send a light pulse, the next none, and then a new pulse, another and finally none.
Sorry about the figures! The "|" sould really align, forming five time bins.
However there are clever techniques to overcome this problem, for example solitons. A soliton is a pulse that can travel through a fibre without changing shape.
First thing, to be able to boot whithout a graphicsadapter you will need a PC with an Award BIOS. The Award BIOS has a seting _NO_VIDEO_INSTALLED_ .
Second you will have to compile a 2.2 kernel with (or FreeBSD) with serialconsole option. To be able to login via your serialconsole you must also modify your inittab to run a getty on that console.
Now comes the tricky parts. To be able to send an hard reset you will need special hardware, thats not good. An alternative solution would use some type of watchdog software. The basic function of a watchdog is to perform a softreset if the machine hangs (simplified that is).
the next problem is what to do with all the serial cables? I hav no idea! Maybe there are some type of hub...
They have all, the UNICIES, come in new "spring" versions: RedHat, FreeBSD and now OpenBSD, unfortunatly they don't support installation with my initio SCSI-controller. I still have to tweak things. I'm tired of that!!!!!
Slashdot Mirror
| * | | * | * | |
| * * | | * * | * * | |
|** **|*******|** **|** **|*******|
Dispersion makes the pulses to broaden and makes it troublesome for the reciever to detect if there is a pulse or not in the time bin.
| ***| | *** | *** | |
| *** |*** *|** **|** **|* |
|* | *** | | | *******|
Sorry about the figures! The "|" sould really align, forming five time bins.
However there are clever techniques to overcome this problem, for example solitons. A soliton is a pulse that can travel through a fibre without changing shape.
Please check out these HOWTO's
a l-HOWTO.html
r minal.html
http://www.linux.org/help/ldp/howto/Text-Termin
http://www.linux.org/help/ldp/howto/mini/Mac-Te
The latter answers your question!
To all people writing to Ask Slashdot:
Please check the HOWTO's before asking these silly questions, or in other words RTFM.
How about the noise? If it's quiet i might get one.
First thing, to be able to boot whithout a graphicsadapter you will need a PC with an Award BIOS. The Award BIOS has a seting _NO_VIDEO_INSTALLED_ .
Second you will have to compile a 2.2 kernel with (or FreeBSD) with serialconsole option. To be able to login via your serialconsole you must also modify your inittab to run a getty on that console.
Now comes the tricky parts. To be able to send an hard reset you will need special hardware, thats not good. An alternative solution would use some type of watchdog software. The basic function of a watchdog is to perform a softreset if the machine hangs (simplified that is).
the next problem is what to do with all the serial cables? I hav no idea! Maybe there are some type of hub...
Wonder when my grammar will improve?
They have all, the UNICIES, come in new "spring" versions: RedHat, FreeBSD and now OpenBSD, unfortunatly they don't support installation with my initio SCSI-controller. I still have to tweak things. I'm tired of that!!!!!