On Nov 13, 15:12, Jochen Kunz wrote:
> You need a 60 pin flat ribbon cable that goes to the drives in a bus
topology
> with the last dive terminated. (Much like SCSI) Then you need a separate
> 24 (26?) pin flat ribbon cable per drive from the controller to each
drive.
> Should be easy to get the components and crimp the cables.
You might get away with ordinary ribbon cable, which usually has a
characteristic impedance around 100-120 ohms, for short distances, but the
A cable is really supposed to be 30 twisted pair ribbon cable (one trade
name
is Twist-n-Flat), characteristic impedance 100 ohms. It's wired pin 1 to
pin 1 ... pin 60 to pin 60. The B cable is supposed to be 26-pin flat
shielded cable, with a drain wire, characteristic impedance 130 ohms. It's
also wired pin-to-pin.
The lengths don't matter, as long as they're within the limits: 35 feet for
the A cable and 50 feet for the B cables. How useful it is to have the
daisy-chain cable shorter than the radial cables, I don't know :-)
--
Pete Peter Turnbull
Network Manager
University of York
Received on Tue Nov 13 2001 - 13:44:35 GMT