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The SCSI In ports are used to connect to a host and require an external cable with
a 68-pin High-Density male connector to mate at the enclosure side. Cables are
not included.
Each SCSI channel must use a separate external cable connection from the
rackmount to the host adapter or RAID controller. It is important that the external
cable length and impedance is taken into consideration and is adequate for the
devices and SCSI speeds being used.
JMR carries its own line of high quality external SCSI Cables.
Termination
Termination must be provided at the end and beginnings of each SCSI bus either
internally or externally. Drive level termination is not recommended since the
terminated device may be easily removed.
Termination is not automatic and the Channel A OUT and Channel B OUT
connections must have LVD/SE termination if not used.
Daisy-Chaining
SCSI I/O Out ports are used to add other enclosures and devices to the SCSI bus.
SCSI I/O Out ports require a cable with a 68-pin High-Density male connector to
mate. When daisy chaining, the SCSI I/O Out port of the enclosure is connected
to the SCSI I/O In port of the enclosure or device being added. Ensure that when
new devices are added to the SCSI bus, that the ID does not have a conflict. Once
the units are connected together, termination must be moved to the last device or
enclosure on the SCSI bus.
The devices or enclosures daisy-chained together must be compatible SCSI
devices. Single-ended interface devices cannot be on the same daisy-chained bus
with differential interface devices. Up to 16 devices (including the host) may be
daisy-chained together on the same bus.
SCSI Accessories
JMR carries its own line of external
terminators. The following Table lists JMR part numbers and descriptions. Please
contact a JMR representative for current availability and pricing.
JMR SCSI TERMINATORS
JMR Part #
Ends
CNA-01883
Molded
SCSI JBOD Installation Guide Rev A
compatible SCSI SE and LVD
Connector Type
Terminator Type
SCSI-3 (68-pin)
SE/LVD Multimode
4-4
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