Parallel SCSI: Difference between revisions

Revision as of 00:35, 4 March 2022

Revision as of 14:55, 22 April 2022

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Some early disk drives included internal terminators, but most modern disk-drives do not provide termination and termination must be provided externally.

There is a special case in SCSI systems that have mixed 8-bit and 16-bit devices where [[SCSI high byte termination|high-byte termination]] may be required.<!--[[User:Kvng/RTH]]-->

==Compatibility==

Different SCSI transports, which are not compatible with each other, usually have unique connectors to avoid accidental mis-plugging of incompatible devices. For example, it is not possible to plug a parallel SCSI disk into an [[FC-AL]] backplane, nor to connect a cable between an SSA initiator and an FC-AL enclosure.<!--[[User:Kvng/RTH]]-->

For purposes of discussing compatibility, remember that SCSI devices include both [[host adapter]]s and peripherals such as disk drives. When asking whether it can cable a certain host adapter to a certain disk drive, this asks whether it can attach those two SCSI devices to the same SCSI bus.

Different SCSI transports, which are not compatible with each other, usually have unique connectors

to avoid accidental mis-plugging of incompatible devices. For example, it is not possible to plug a parallel SCSI disk into an [[FC-AL]] backplane, nor to connect a cable between an SSA initiator and an FC-AL enclosure.

===Mixing different speeds===