22 Dec
2012
22 Dec
'12
3:06 p.m.
On Tue, Dec 18, 2012 at 4:20 PM, MG <marcogb at xs4all.nl> wrote:
A lot more than 8. On 'narrow' SCSI, there are 8 data lines + optional
parity, and abotu as many control lines. Oh, and termpwr. And I thin 24
ground pins (the ground correspoding to the termpwr pin is not wired to
prevent a power supply short circuit if you plug the cable in upside-down).
Purely out of curiosity, is anyone aware of the
possible existence
of LVD/SE SCSI (e.g. HD68) over UTP (RJ45) extenders? I'm aware
that one normally goes for FC, or a SCSI<=>FC bridge, but those
tend to be rather pricey.
If you mean actually electrically extending SCSI, I haven't seen such
a thing. I guess my first question would be: how many wires, out of
the 50 or more pins present on its connectors, does SCSI use? If it's more than the eight in an RJ45-ended cable, then I
don't see how it
I guess I am the only person to object to the term 'RJ45' beign used
generically for the 8p8c connector...
Given a sufficinetly high serial bit rate, I see no reason why you
cou;dn't serialised the SCIS signals and send them over the 4 twisted
pairs you have on an 8p8c conenctor.It's been done with other interfaces,
afte all.
Reve the 8p8c restricion and of course it's trivial. There is no reason
why you can't wire a SCIS system with twist-n-flat ribbon cable. And
since this is unscreend it is technically unshielded twisted pair. OK,
not what you were asking at all.
-tony