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SCSI Cable Length
We
strongly recommend that jukebox configurations with four or
more drives (or that exceed the SCSI maximum bus length specification
for the Single-ended host adapter interface) use a differential
SCSI host adapter interface. This will provide the proper
signal strength necessary to ensure reliable communication
on the bus to the optical device is provided for.
The
calculation of the total SCSI bus length involves not only
the physical cable(s) used to connect the optical device(s)
to the host adapter interface, but also the optical device
itself. You must allow for the internal resistance that the
optical drive(s) and jukebox controller adds on to this total
bus length.
To
accurately calculate the total SCSI bus length of your optical
configuration, add to the physical SCSI cable(s) length being
used, 2 feet for each optical drive and jukebox controller
in the bus chain. This total provides a more accurate measurement
of the total SCSI bus length being used by the system.
FAST
SCSI: 10
MB/S: (Used in a majority of 5.2 GB optical devices and their
related jukeboxes)
Maximum
BUS length supported:
Single-ended host adapter interface: 3 meters or
9.8 feet
Differential host adapter interface: 25 meters or
82 feet
Low
Voltage Differential (LVD)-
Maximum
BUS length supported:
LVD
host adapter interface: 12 meters or 39.4 feet
Single-ended host adapter interface: 3 meters or
9.8 feet
Legacy
Systems (pre-1998)
SCSI-1:
SCSI-1: 5
MB/S (Used
in a majority of 1.3 and 2.6 GB optical devices and their
related jukeboxes)
Maximum
BUS length supported:
Single-ended host adapter interface: 6 meters or
19.6 feet
Differential host adapter interface: 25 meters or
82 feet
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